University Programs

NSSBC Clarifications

2017 Official Clarifications

Clarifications are based on the 2017 Official Student Steel Bridge Competition Rules 
All clarifications have been reviewed and approved by the Rules Committee.

Full Index of Clarifications

Click on each section below to read the posted clarifications.

NSSBC Clarifications

1. Mission and Summary

There are no clarifications for Section 1 at this time.

2. Introduction

There are no clarifications for Section 2 at this time.

3. Problem Statement

There are no clarifications for Section 3 at this time.

4. Eligibility

There are no clarifications for Section 4 at this time.

5. Safety

There are no clarifications for Section 5 at this time.

6. Scoring

Q6.1.  Is there a weight limit for individual members in addition to the weight limit for the entire bridge?  Marjorie Fera, University of Notre Dame

A.  There is no weight limit for members or for the bridge.  However, the weight of the entire bridge influences scoring.  [6.2.3, 6.2.6, 8.2.2.2]

7. Schedule of Competition

Q7.1.  Are there six different vertical loading conditions, and does the second roll of the die only determine the designation of the left and right sides of the bridge for location of sway and deflection measurements?  Yuan Calderon, University of Puerto Rico Mayaguez

A.  Yes to both questions.  [7.1, 11.4.2, 11.4.3, 11.5.1.3]

Q7.2.  If the judge rolls an odd number on the second roll of the die, will the load position M be measured from the C end of the bridge?  Sandra M. Torres, New York City College of Technology

A.  No.  The dimension M is always measured from the A end.  The second roll of the die designates left and right sides of the bridge, which determines where lateral pull is applied and where sway and deflection are measured.  The right and left labels on drawings 3 and 4 correspond to an odd number on the second roll and illustrate the locations of lateral pull and sway and deflection measurements relative to right and left sides.  [7.1, 11.4.2, 11.4.3, 11.5.1.1, 11.5.1.3]

8. Material and Component Specifications

Q8.1.  Are internally threaded hollow members allowed?  Leah Miyasato, University of Hawaii Manoa

A.  There would be a penalty for violation of specification 8.2.5.2.  The intent of the specifications is that every connection utilizes a loose or welded nut.  [8.2.5.2, 9.4.1]


Q8.2.  May coupling nuts be used?  Carmelo Giglio, Florida Atlantic University

A.  Yes, if they comply with specifications in sub-section 8.2.4, 9.4, and 9.5.  [8.2.4.1, 8.2.4.2, 9.4.2, 9.5]


Q8.3.  May a nut be welded into the end of a HSS (hollow structural shape, i.e., tube)?  Carmelo Giglio, Florida Atlantic University

A.  Yes.  The HSS should have an inspection hole so that compliance with specification 9.4.2 can be verified.  [8.2.2.1, 8.2.5.2, 9.4.2, 9.5]


Q8.4.
  May any grade of steel be used as long as it is "strongly attracted to the magnet provided by the host chapter?"  Michael Demyan, Pennsylvania State University Harrisburg

A.  Yes.  [8.1]


Q8.5.  May a member be made of sheet metal?  May it be cold-formed?  Heith Renschen, Oklahoma State University Institute of Technology

A.  There is no penalty or prohibition for using sheet steel of any thickness or for bending steel. The material must be steel as defined by specification 8.1, and parts of the same member must be connected by welds.  Sheet steel should be purchased uncoated because the zinc coating on Galvanized steel creates toxic fume at welding temperature.  [8.1, 8.2.2.1]


Q8.6. May we use cable that is longer than 3'0" if it can be coiled to fit in the box described in specification 8.2.2.2?  Haolei Hu, Southeast University

A.  There is a penalty for cable of any length because it violates the rigidity requirement of specification 8.2.2.1.  Likewise, chain and strapping are penalized.  [8.2.2.1]


Q8.7.  May the bridge have holes that are open, that is, not used for connections?  Aaron Smith, Portland State University

A.  Yes, except for the decking support surfaces.  [8.2.5, 9.3.9]


Q8.8.  May a hole have a larger diameter than nuts or bolt heads if it is not penetrated by a bolt or threaded part of a member in the finished bridge?  Liu Tong, Tongji University

A.  Yes.  There is no limit on the size of open holes.  [8.2.5]


Q8.9.  Will there be a penalty for a member that is more than six inches wide but fits diagonally in the box described in specification 8.2.2.2?  Steven Looby, University of Dayton

A.  No penalty if the member can be put it the box in any orientation with no force other than gravity.  [8.2.2.2]


Q8.10.  May part of the bridge be wire?  Omar Adel Dwaba, Zagazig University

A.  For the bridge competition, wire is defined as thin material having a round, solid cross-section not comprised of multiple strands.  Part of the bridge may be wire but shall comply with the member rigidity requirement of specification 8.2.2.1.  Competitors shall not bend wire parts (or any other parts) at any time after the bridge is staged for pre-construction inspection.  Wire must be taut when the bridge is complete.  Specifications and regulations apply to wire as they would to any other material.   Material consisting of multiple parallel or twisted strands is considered to be cable, not wire, and would violate the rigidity requirement.  [8.2.2.1, 10.6.3, 10.9.3]


Q8.11.  May holes be slots rather than round?  Alejandro Pino, Universidad La Salle

A.  Yes.  Holes are not required to be round.  [8.2.5.1]


Q8.12.  May bolts and nuts be welded to members?  Gustavo Lopez, San Diego State University

A.  Yes, they become parts of the members and are not considered to be loose.  Welding is not permitted during the competition.  [7.2, 8.2.2.1, 10.2.3]


Q8.13.  Are Nylock nuts and washers allowed?  Steven Stella, Colorado School of Mines

A.  Part of a Nylock nut is not steel which would result in disqualification of the bridge.  Similarly, a washer that is not all steel would result in disqualification.  If an all-steel washer is welded to a member, it is just part of that member.  If an all-steel washer is loose (i.e., not welded to a member), it is considered to be a separate member and is governed by all specifications and construction regulations regarding members.  [8.1, 8.2.2.1, 8.2.4]


Q8.14.  May the center, internally threaded link of a turnbuckle be part of the bridge?  Anthony Hewitt, California State University Chico

A.  There would be a penalty if it was used as a member because it is internally threaded.  There would be a penalty if it was used as a nut unless it is threaded for its full length, has the external shape of a single hexagonal prism over its full length, is commercially available, and has not been modified.  [8.2.4, 8.2.5.2]


Q8.15.  Are flange bolts and nuts allowed?  Nicholas Jackson, Pennsylvania State University Harrisburg

A.  Flange bolts are allowed.  Flange nuts will be penalized.  [8.2.3, 8.2.4.1]


Q8.16.  Are SAE grade 8 nuts and bolts permitted?  Vanescia Cook, Old Dominion University

A.  Yes.  There is no restriction on grade of nuts and bolts.  [8.2.3, 8.2.4]


Q8.17.  Can socket head cap screws be used?  Dylan Newell, Missouri State University

A.  Yes.  For this competition, cap screws are considered to be bolts.  Any type of commercially available, solid steel bolt head is acceptable.  However, nuts must be hexagonal.  [8.1, 8.2.3.1, 8.2.4.1]


Q8.18.
  Can a hole be an L-shaped slot that is open at one end so that a bolt or externally threaded part of a member can slide into it?  Jace Caldwell, Western Kentucky University

A.  Not if that slot is the hole for the fastener required by specification 9.4.1. The intent of specification 8.2.5.1 is that the hole shall be closed (i.e., its perimeter is a complete loop).  There is no restriction on the shape of closed slots.  [8.2.5.1, 9.4.1]


Q8.19.  Can there be a hinge in the bridge?  Kali Randall, Colorado School of Mines

A.  A hinge is a connection that allows relative rotation of the connected parts.  Individual members shall not have hinges, but member-to-member connections may be hinges.  [8.2.2.1, 9.4.1]


Q8.20.  Is shortening a bolt by cutting off the end considered to be mechanical alteration?  David Rojas, Florida International University

A.  Yes, that would be penalized.  [8.2.3.1]

9. Structural Specifications

Q9.1.  May the competition be conducted on a soft surface such as grass or artificial turf?  Marcus Storvick, Washington State University

A.  The material and condition of the floor or ground is the responsibility of the host student chapter and must be accepted by competitors.  The Rules Committee recommends that load testing be conducted on pavement.  If that is not possible, steel plates should be provided as footings, and deflections should be measured from solid surfaces or from a string stretched between footings.  Conditions and procedures shall be the same for all teams.  [9.2.6, 11.3]


Q9.2.  Does "decking support surface" refer to the top chord of the bridge?  Austin Moore, University of Arizona

A.  Decking support surfaces are not members; they are surfaces of members on which the decking may be placed.  Longitudinal lines on round or prismatic members also are considered decking support surfaces if decking may be placed on them.  [9.2.1, 9.2.3, 9.3.4, 9.3.5, 9.3.7, 9.3.8, 9.3.9, 12.2]


Q9.3.  Is the minimum required width of the bridge 3'6" per specification 9.2.2 or 3'7" per the template specified by 9.3.7.  Veronica Timpane, Columbia University

A.  There is no specified minimum width of the bridge.  Specification 9.2.2 assures that the bridge can accommodate the decking used for load testing. The template governs both spacing of the decking support surfaces and clearances, and applies whether or not there is structure above the deck.  Regulation 10.4.2 restricts the lateral spacing of surfaces of the bridge that bear on the ground.  [9.2.2, 9.3.7, 10.1.8, 10.4.2]


Q9.4.  In section 1 on the Bridge Diagrams drawing, the decking support surfaces are 2'7" above ground.  Is that the required height or a limit?  Austin Deanhardt, Oregon Institute of Technology

A.  The cross-hatched area on the drawing is labelled as the envelope of the bridge, so every part of the bridge should be within that envelope but not necessarily touching its outline.  Therefore, the decking support surfaces shall not be higher than 2'7".  The drawing correctly illustrates specification 9.3.4.  [9.3.4]


Q9.5.  The Problem Statement concerns a bridge that spans "approximately 200 feet" and a "1:10 scale model."  This implies a twenty-foot long bridge, but the drawings show a length of twenty-one feet.  How long should our bridge be?  Michael Demyan, Pennsylvania State University Harrisburg

A.  That dimension on the drawing is the length of the enclosing envelope of the bridge and the out-to-out spacing of footings A and C.  The length of your bridge is governed by specifications 9.3.1, 9.3.5, and 9.3.6.  [3, 9.3.1, 9.3.5, 9.3.6, 10.1.8]


Q9.6.  If two members are connected by a loose bolt and nut or by an externally threaded part of a member and a nut, as required by specification 9.4.1, may the same two members also be connected by one or more additional bolts or externally threaded parts of a member without nuts?  Sang Kang, Purdue University Northwest

A. Two members may be connected by multiple loose bolts or externally threaded parts of members, which may consist of bolts welded to members.  At least one of those bolts or threaded parts must be secured with a nut.  Each individual loose bolt must be secured with a loose or welded nut.  Nuts are not required on externally threaded parts that are auxiliary to fasteners that fulfill specification 9.4.1.  [8.2.2.1, 9.4.1, 9.4.3]


Q9.7.  May a decking support surface vary in width?  Michael Dolen, École de Technologie Supérieure

A.  Yes, within the limits prescribed by specifications 9.3.7 and 9.3.8.  [9.3.7, 9.3.8, 9.3.9]


Q9.8.  If two members are in contact at several places, is a connection compliant with specifications required at only one of those places?  Ryan Hull, Clemson University

A.  Yes.  Additional compliant and non-compliant connections are optional but not required.  [8.2.2.3, 8.2.3, 8.2.4, 8.2.5, 9.4, 9.5]


Q9.9.  Would specification 9.3.9 be violated if the decking support surfaces have welded areas?  Benjamin Johnk, University of Colorado Denver

A.  Not a violation if the welds are flat and level with the surrounding steel.  [9.3.9]


Q9.10.  Is compliance with the limiting dimensions specified in section 9 checked during and after loading?  Kyle Smith, Bradley University

A.  No.  Those dimensions are checked before loading only.  However, there are limits on deflections that occur during load tests.  [9.1, 11.5.2]


Q9.11.  Is the entire surface of a loose nut or the head of a loose bolt required to contact the surface of a member?  Steven Looby, University of Dayton

A.  No. Contact at a single point is sufficient for the purpose of the competition.  [9.4.3]


Q9.12.  Is the 1/4 inch limit on gaps in decking support surfaces cumulative over both decking support surfaces or just one?  Parth Patel, University of Wisconsin Madison

A.  Neither.  It is not cumulative.  That limit applies separately to every juncture of segments of a decking support surface that are surfaces of adjacent members.  [9.2.1, 9.3.9]


Q9.13.  May a decking support surface have holes for bolting it to the bridge?  Jon Machado, San Francisco State University

A.  Bolt heads and nuts that protrude from a decking support surface will be penalized as violations of specification 9.3.9.  Holes in a decking support surface violate the same specification.  Decking support surfaces are tops of members, not entire members.  [9.2.1, 9.3.9]


Q9.14.  Are decking support surfaces required to fit exactly into the notches in the bottom of the vehicle clearance template?  Jon Machado, San Francisco State University

A.  When compliance with specifications 9.3.7 and 9.3.8 is checked, the horizontal tops of the 1 x 2 inch notches shall be in contact with both decking support surfaces, which are tops of members.  A decking support surface may be any width less than two inches. [9.2.1, 9.3.7, 9.3.8]


Q9.15.  May the elevation of a decking support surface change along the length?  Liu Tong, Tongji University

A.  Yes, but specification 9.3.7 is violated if the change in elevation is so abrupt that passage of the template is obstructed.  The only exception is tolerance for a change of no more than 1/8 inch at the juncture of segments of a decking support surface that are surfaces of adjacent members.  [9.2.1, 9.3.7, 9.3.8, 9.3.9]


Q9.16.  May the bridge be longer than twenty feet?  Aaron Smith, Portland State University

A.  Yes, but at the conclusion of timed construction, the bridge, including decking support surfaces, shall be within the bridge envelope, which is longer than twenty feet.  The decking support surfaces shall be at least twenty feet long.  [9.3.5, 9.3.6]


Q9.17.  Is there a violation if a member is not connected by a loose bolt or externally threaded part to each other member that it touches, even though the member cannot be separated from the other members without first separating those other members, which are connected by loose bolts or externally threaded parts?  Sean Hopper, Northern Arizona University

A.  Yes, that’s a violation.  [9.4.1]


Q9.18.  Does the 1'6" minimum under-bridge clearance apply to the space between footings?  Henry Kuehr-McLaren, University of North Carolina Charlotte

A.  Yes, specification 9.3.10 is violated if there is material lower than 1'6" anywhere except within the vertical projections of the 1'0" by 1'8" declared footings.  [9.3.10]


Q9.19.  May the base plates of the bridge be smaller than the footings?  May the base plates slide around in the footings during construction?  Christopher Martin, Catholic University of America

A.  Yes to both questions.  However, there will be a penalty if any part of a constructed portion, including base plates, touches ground outside a footing.  [10.4.2]

10. Construction Regulations

Q10.1.  Regulation 10.3.10 list items that a builder shall not use "to support the builder's body weight."  Does this refer to the builder's entire weight or just to any part of the builder's weight?  Andrew Jones, University of Missouri

A.  It refers to any portion of the builder's weight.  The regulation is violated if, in the opinion of a judge, the builder would fall, stumble, or lose balance if the item suddenly disappeared.  [10.3.10]


Q10.2. If we build a simple span bridge using footings A and C, will we be able to choose which end is A and which end is C?  George Brown, California State University Sacramento

A. The footings will be labelled on the floor before the start of the competition.  When a team finishes construction, judges (not team members) will mark as A the end of a bridge that bears on the footings labelled A, and that end will be the A end of the bridge for all subsequent phases of the competition.  The other end will always be the C end.  [10.1.8, 10.3.11]


Q10.3.  What defines if a builder is in a construction zone?  Luis Molina, California State University Northridge

A.  A builder is in a construction zone if all parts of the builder's body and of items being worn by the builder that touch the ground are touching the ground within the construction zone.  [10.1.1, 10.1.3, 10.1.5, 10.1.9, 10.1.15, 10.3.11, 10.3.12]


Q10.4.  How many members constitute a constructed portion?  Andrew Czubai, University of Texas Arlington

A.  One or more.  [10.1.15, 10.3.11]


Q10.5.  May a temporary pier be used to assist in moving a constructed portion across the river?  Andrew Czubai, University of Texas Arlington

A.  Yes, if done safely in the opinion of a judge.  However, the temporary pier itself shall not be moved while it is supporting the constructed portion.  [10.1.13, 10.1.15, 10.3.1, 10.3.9, 10.4.6]


Q10.6.  After a constructed portion starts on the ground within a footing, may it be lifted off the footing while simultaneously supported by a temporary pier and builder(s)?  Mark Portes, California State University Pomona

A.  Yes, if done safely as determined by the judge.  [9.3.1, 10.1.8, 10.1.15, 10.3.1, 10.3.11, 10.3.13, 10.4.2]


Q10.7.  Is a single member or group of connected members considered to be part of a constructed portion if they are not in direct contact with a constructed portion but are in contact with a tool that is in contact with a constructed portion?  Joseph Spaziani, Virginia Polytechnic Institute and State University

A.  No.  Members must be in direct contact with a constructed portion to become part of it.  There will be an accident penalty for members that are not part of a constructed portion but are in contact with one another.  [10.1.15, 10.3.11, 10.4.5]


Q10.8.  What portion of a temporary pier must touch the river or ground within a construction zone?  Edmond Yi, University of California Berkeley

A.  There will be a penalty if any part of a temporary pier touches the ground in a transportation zone or the ground outside the site boundary.  [10.1.3, 10.1.13, 10.2.4, 10.4.3]


Q10.9. May a builder wear a cape during timed construction?  Barry Qui, University of British Columbia

A.  Capes are considered to be clothing.  Builders may wear capes if, in the opinion of a judge, safety is not compromised and additional clothing fulfills norms of decency.  [10.3.1, 10.3.3, 10.4.1]


Q10.10.  May a tool be attached to the bridge during timed construction?  May tools be attached to one another after the start of timed construction?  Seth Kirk, University of Houston

A.  Yes to both questions, assuming that the tools can be joined and used safely, in the opinion of a judge.  [10.1.12, 10.2.3, 10.3.1, 10.9.1]


Q10.11.  Are there dimensional limits on tools?  Seth Kirk, University of Houston

A.  No, but weight is limited and tools must fit in the staging yards.  [10.1.12, 10.2.3, 10.6.2]


Q10.12.  May a loose bolt be removed from a member or constructed portion and then installed again, either in the same location or in another hole?  Vanescia Cook, Old Dominion University

A.  Yes.  Furthermore, reuse of a loose bolt that has been removed is not required.  [10.3.11, 10.3.13]


Q10.13.  Is there a penalty if part of the bridge extends into the transportation zone during timed construction?  Liu Tong, Tongji University

A.  No regulation would be violated if, during timed construction, part of the constructed portion that does not touch the ground extends through the vertical plane defined by the boundary between a construction zone and a transportation zone.  Specification 9.3.6 would be violated if that condition exists after the end of timed construction.  Regulation 10.4.2 would be violated if part of the constructed portion touches the river or the ground outside a declared footing or staging yard.  Regulation 10.3.14 would be violated if part of the constructed portion extends through a vertical plane defined by the site boundary.  [9.1, 9.3.6, 10.1.3, 10.3.14, 10.4.2]


Q10.14.  May two or more members that are in contact with one another and are part of a constructed portion be removed from the rest of that constructed portion to become a separate constructed portion supported by a temporary pier or piers?  Brendan Schiaffo, Catholic University

A.  Yes, the assembly of multiple members would be considered to be a constructed portion.  At no time shall that assembly be supported solely by a builder or builders, and the procedure shall be safe in the opinion of a judge.  [10.1.15, 10.3.1, 10.3.7, 10.3.11, 10.3.13]


Q10.15.  May nuts, bolts, a temporary pier, or a member be passed from one builder to another anywhere within the construction site?  Jorge Cuca Delgado, Universidad Autónoma del Estado de Mexico

A.  Yes.  [10.3.1, 10.3.3, 10.3.5]


Q10.16.  May part of a constructed portion be translated or rotated relative to the other part of the same constructed portion?  Jorge Cuca Delgado, Universidad Autónoma del Estado de Mexico

A.  Yes, but with the following restrictions:  it shall be done safely in the opinion of a judge, the two parts shall be in contact continuously during the process, and at no time shall a builder or builders support the entire weight of either part of the constructed portion.  [10.3.1, 10.3.11, 10.3.13, 10.3.14]


Q10.17.  May lanyards be used to attach tools to builders or their pouches?  Vanescia Cook, Old Dominion University

A.  Yes.  A lanyard may be cord, cable, wire, strapping or any similar suitable material.  A lanyard is considered to be a pouch or part of a pouch if a builder is wearing it at the start of timed construction and connects it to a tool after the start.  If the lanyard is not worn at the start of timed construction, it is a tool or part of a tool and may be attached to the builder after the start.  [10.1.11, 10.1.12, 10.3.3]


Q10.18.  May a builder simultaneously touch a constructed portion and a temporary pier?  Liu Tong, Tongji University

A.  Yes, but the builder may not move the temporary pier while touching a constructed portion.  [10.3.8, 10.3.9]


Q10.19.  During timed construction, may a constructed portion touch only one footing?  Liu Tong, Tongji University

A.  Yes.  [10.3.11]


Q10.20.  May a nut be installed on a bolt before the start of timed construction?  Liu Tong, Tongji University

A.  No.  A pre-assembled nut and bolt is not recognized as a bridge component.  [8.2.1, 10.6.2]


Q10.21.  May the entire weight of a constructed portion be supported by one or both temporary piers?  Liu Tong, Tongji University

A.  Yes, but it must be done safely, and the constructed portion shall start on the ground within a designated footing.  [5, 10.1.8, 10.1.13, 10.1.15, 10.3.1, 10.3.11, 10.3.13]


Q10.22.  Can two members be assembled while on a temporary pier but not yet connected to a constructed portion?  William Pasco, California State University Long Beach

A.  Placing a member on a temporary pier is an accident as described by regulation 10.4.4.  Furthermore, regulation 10.3.11 would be violated because the assembly is a constructed portion that did not begin on a footing.  [10.1.15, 10.3.11, 10.4.4, 10.4.5]


Q10.23.  Can a member be used to aid construction and then be returned to a staging yard?  Daniel Saldana, California State University Long Beach

A.  No. Timed construction continues until all members are incorporated in the bridge.  [8.2.1, 8.2.2.1, 10.6.2, 10.6.3, 10.9.1]


Q10.24.  May a tool that weighs more than fifteen pounds be assembled from separate parts after the start of timed construction?  Joseph Angeli, New Jersey Institute of Technology

A.  Yes.  Each part will be regulated as a separate tool.  The assembly shall be used safely in the opinion of the judge.  [10.1.12, 10.2.3]


Q10.25. 
May a tool that is attached to a constructed portion also hold a member or assembly of members, or be attached to another constructed portion?  Joseph Angeli, New Jersey Institute of Technology

A.  That's acceptable for a single member or another constructed portion.  However, regulation 10.4.5 is violated if members contact one another but are not part of a constructed portion.  [10.1.12, 10.1.15, 10.3.7, 10.3.11, 10.4.5]


Q10.26.  A temporary pier is required to fit in a cylinder of specified diameter, but the length is not limited.  May a temporary pier be used with the unlimited length oriented either vertically or horizontally.  Bo Hua, University of Massachusetts Lowell

A.  Yes.  The orientation of temporary piers is not restricted.  [10.1.13, 10.2.4, 10.6.2]


Q10.27.  May a builder support a constructed portion while it is touching only one footing?  May that builder move and move the constructed portion that he or she is partially supporting?  Elliot Esquivel, New Mexico Institute of Mining and Technology

A.  Yes to both questions providing that it is done safely in the opinion of the judge and the builder remains in a construction zone.  [5, 10.3.1, 10.3.8, 10.3.11, 10.3.12, 10.3.13, 10.3.14]


Q10.28.  May a temporary pier be adjustable?  Colin Martin, Georgia Institute of Technology

A.  No.  [10.2.4]


Q10.29.  May a temporary pier be moved?  Pang Xiaoxuan, Hohai University

A.  Yes, if it is not supporting a constructed portion, and if no builder simultaneously touches that pier and a constructed portion or member during the move.  [10.1.13, 10.3.8, 10.3.9, 10.3.13, 10.4.3]


Q10.30.  May a constructed portion be used to support temporarily a member or assembly of members?  Tres Litten, Citadel

A.  A constructed portion or member shall not touch the river or ground outside of declared footings.  A member or assembly of members placed on a constructed portion is considered to be part of that constructed portion.  An individual member may be removed; it becomes a member again.  An assembly of members may be removed from a constructed portion if conditions noted in clarification Q10.14 are met.  Otherwise, the assembly must be taken apart first and moved as individual members.  [10.1.15, 10.3.11, 10.3.13, 10.4.5]


Q10.31.  May a builder stand on a member, tool, or temporary pier in a staging yard?  Pang Xiaoxuan, Hohai University

A.  Yes, if the judge determines that it is done safely.  Items not listed in regulation 10.6.2 shall not be in a staging yard. [5, 10.1.12, 10.1.13, 10.3.1, 10.6.2]


Q10.32.  May a team play recorded music while constructing?  Sydney Hamilton, University of Pittsburgh Johnstown

A.  The head judge on-site will make this determination.  Music is not acceptable if it disturbs judges or other teams, is too loud, or the lyrics are offensive.  Music will not be allowed at the national competition.  [10.2.1, 10.6.2]

11. Load Test Instructions

Q11.1.  The second bullet point in instruction 11.5.1.3 includes the term "far end."  Does this indicate the far end of the decking unit from the A side or the C side of the bridge?  Does the determination of A or C depend on the second roll of the die described in 7.1(7)?  Andrew Faett, Lafayette College
 
A.  The A and C labels designate ends of the bridge, i.e., where vehicles would enter or exit.  Sides are parallel to direction of travel.  The A end is the end at the A footings; the C end is the opposite end.  After construction, the judge will mark the ends accordingly.  Rule 7.1(7) describes how left and right sides of the bridge are determined after construction.  The term "far end" in 11.5.1.3 identifies the farthest end of the decking unit from the A end of the bridge as illustrated by the Vertical Loading Plans.  [7.1, 9.3.1, 10.1.8, 11.5.1.3]


Q11.2.  Will there be preload placed on the decking before loads Wb and Wc?  Sarah Huang, University of Wisconsin Madison

A.  No.  [11.5.2, 11.5.3]


Q11.3.  Can you provide lateral and vertical loading plans for a cantilever design?  Vipul Agrawal, VIT University Vellore

A.  The two pages of loading plans (views looking down) in the Rules apply to both simple span and cantilever designs.  Loading is identical for both types.  For cantilever designs, the footings labelled C are not used; for simple span designs, the footings labelled B are not used.  [10.1.8, 11.4, 11.5]


Q11.4.  Do we need to consider vertical deflection of the bridge or decking support surfaces at locations where deflections are not measured?  Austin Kirsch, University of Kentucky

A.  Scoring is based on deflections measured at specified locations.  However, the bridge will be disqualified if any part other than the intended bearing surfaces contacts a safety support or the ground during loading.  [6.2.4, 11.5.1.1, 11.5.1.3, 11.5.2]


Q11.5.  Is the load placed on the decking before or after the decking is placed on the bridge?  Austin Kirsch, University of Kentucky

A.  Decking is placed on the bridge first, then load is placed on the decking.  [11.5.1.1, 11.5.2]


Q11.6. Is each deflection measurement, DbL, DbR and DcL, rounded to the nearest 0.01 inch, or is it the sum that is rounded?  Liu Tong, Tongji University

A.  The sum (i.e., aggregate deflection) is rounded, not the individual measurements.  However, conference competitions may not be equipped to measure deflections to that level of precision.  [11.5.1.3, 11.5.2]


Q11.7.  Will load testing commence or continue if a weld breaks?  James Roney, University of Washington
 
A.  The bridge will be disqualified if a weld breaks or is discovered to be broken during any phase of the competition.  [3, 7.2, 8.2.2.1, 11.1]


Q11.8.  Is there a violation if several members that are in contact before loading do not maintain that contact during loading?  The members are fastened together in compliance with specifications and remain fastened during loading, but they are not fastened at the places where contact is lost.  Lee Shields, University of West Virginia

A.  There is no rule that specifically addresses this condition.  However, the bridge could be disqualified if the head judge determines that safety is compromised or if the intent of the competition is circumvented.  [3, 5, 9.4.1, 11.1, 11.2, 11.4.1, 11.5.2]

12. Equipment Provided by Host

There are no clarifications for Section 12 at this time.

13. Interpretation of Rules

There are no clarifications for Section 13 at this time.

14. Judging

There are no clarifications for Section 14 at this time.

15. Appeals

There are no clarifications for Section 15 at this time.

16. Index of Definitions

There are no clarifications for Section 16 at this time.

APPENDIX

  • Construction Site
  • Bridge Diagrams
  • Lateral Loading Plans
  • Vertical Loading Plans