Rules, Tools And Materials - Qcesc

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Rules, Tools and MaterialsFinancial assistance is available see CostObjectiveBuild a model bridge onsite with provided tools and materials within 3 hours with the greateststructural efficiency.WhenFriday, January 27th:Check-In/SetupBridge BuildingLoad TestingSaturday, January 28th:Check-In/SetupBridge BuildingLoad TestingAwards Ceremony12:00 pm - 12:30 pm12:45 pm - 3:45 pm3:45 pm - 5:15 pm8:00 am - 8:30 am8:45 am - 11:45 am12:15 pm - 1:45 pm1:45 pm - 2:15 pm If School is cancelled on Friday, Jan. 27 or dismissed early, the Battle of the Bridges willbe cancelled and held on the alternate date of Feb.24 If the Putnam is closed on Saturday, Jan. 28 due to inclement weather, the decision toclose will be made by 6:00 am Saturday and a voicemail message will be placed on thePutnam’s main phone number, (563) 324-1933. The snow date is Saturday, Feb. 25. IfThe Putnam is open, the event will be held as scheduled. Contact The Putnam Museum(563-336-7296) if a team will not be able to compete.On either date, if the event is cancelled and teams cannot compete on the alternate date, entryfees will be refunded. If the event is held as scheduled, entry fees will not be refunded;however pre-paid pizza and pop orders will be refunded. Saturday teams can pre-order pizza for delivery at 12 pm through the on-line registrationform. Sack-lunches are allowed to be eaten in the Grand Lobby. Each participant will receive one bottle of water during the bridge build time.WhereThe Putnam Museum1717 West 12th StreetDavenport, IA 528041

CategoriesThe event is open to any student, grade or age for either Friday or Saturday. The primary reasonfor the Friday session is to raise high school team participation as this is the first event of threefor the QC Tech Challenge. A team may consist of two to four people, where all team membersmust be signed up on the registration form.Categories #1-4 are competing for a team trophy and individual medals. team members must know their team name at registration.Family (Any combination – kids, adults, seniors) – see Rule #10Elementary (Grades 4-6)Middle School (Grades 7-8)High School (Grades 9-12)Professional (Adults only, 18 years old – no additional qualifications)new this year, competing for a Certificate and bragging rights!Registration limitations:Friday: 40 teams max (any combination) limited to 8 teams from ANY ONE SCHOOLSaturday: 40 teams max (any combination), limited to 8 High School teams onlyCost 25.00 per teamFinancial assistance is available contact The Putnam Museum @ 563-336-7296The entry fee includes a bridge material kit and the use of a complete tool set provided at theevent. This does not include entrance to the museum and/or theatre, which is not required toparticipate in or watch the event.AwardsGreatest EfficiencyAwards (1st, 2nd, and 3rd) are given to teams in each of the five competitive categories for havingthe greatest structural or build efficiencies.Most Innovative DesignAn award for the Most Innovative Design will be given to a single team and is judged from allteams over all categories.ScheduleRegistration Deadline – Thursday, January 26th, 2017. The registration form and further detailsare available at by December 16, 2016 (to be announced on QCESC- FB page).Questions or concerns will be addressed by either the QCESC’s Jeff Melvin([email protected]) or The Putnam Museum’s Alice Loff ([email protected]).2

Tools and Materials ListFigure 1: The tools and materials supplied in a build kit.ToolsProvided: Hack Saw Coping Saw Scissors Pliers Speed Square 12” Ruler Yardstick 2 Tubes of Glue(4g each) 25 Clothes pinsUtility Knife Flat File Square File Masking Tape String 3rd tube of glue(you must turn in the 2empty tubes) Graph PaperAvailable Upon Request: Nitrile (Non-Latex)Gloves Caliper Floral Wire3

MaterialsBridge Decking (Poster Board)1 - 21 314-inches1 100 - 412 38 12-inches (Craft Sticks)1 100 - 6" 34 16-inches (Craft Sticks) 25 -2 - 36 14 14 inches (Bass Wood)332 - 24 16 16-inches (Bass Wood)381 16-inches (Stir Sticks)Rules:1. Bridges must be designed to accommodate the loading apparatus and be able to support aweighted toy truck rolled across it. See the testing procedures below for more specifics.2. The bridge span can be no greater than 24 inches or less than 19 inches, see bridge inspectionchecklist diagram below. Teams are provided a wood “fixture” used to model the test rig.3. The bridge height can be no greater than 9 inches above the deck or 9 inches below the deck. Acombined total height above and below the deck cannot exceed 12 inches. See bridgeinspection checklist diagram below.4. The bridge width can be no greater than 6 inches or less than 4 inches. See bridge inspectionchecklist diagram below.5. All decisions by the judges are final.6. Teams will independently build a bridge within 3 hours at the event site using a set ofprovided materials. Teams may ask the judges for suggestions. No pre-constructed bridgecomponents are allowed; however, pre-drawn designs are permitted.7. Each team will build its bridge with a provided set of standard tools. Only the provided toolsmay be used during the build phase and no tool, whole or in part, may be built into the bridgeitself.8. All bridges will be judged based on the highest structural efficiency rating, as calculated by,𝐒𝐭𝐫𝐮𝐜𝐭𝐮𝐫𝐚𝐥 𝐄𝐟𝐟𝐢𝐜𝐞𝐧𝐜𝐲 𝐌𝐚𝐱𝐢𝐦𝐮𝐦 𝐋𝐨𝐚𝐝𝐁𝐫𝐢𝐝𝐠𝐞 𝐖𝐞𝐢𝐠𝐡𝐭9. In the event of a structural efficiency tie, the lightest bridge wins. It is up to the team todecide on the optimum balance between weight and strength.10. Adults are encouraged to participate in the FAMILY DIVISION only. To ensure fairnessthroughout the different age categories, only QCESC volunteers are to work with teamsoutside of the FAMILY DIVISION. Violators risk non-refundable team disqualification.4

Testing Procedure1. Each team’s bridge is inspected by the judges for compliance with the dimensions specifiedin the rules.2. The bridge weight is recorded.Figure 3: A bridge spanning the abutments of the test rig.3. The bridge is placed on the test rig (fig. 3).Figure 4: The weighted toy truck.4. To verify the bridge acts as a bridge, a weighted toy truck (fig. 4) with dimensions of 3x2.5inches and a weight of 5 lb is rolled across the entire length of the bridge.5. The loading hanger is attached to the bridge and the loading platform is hung from thehanger.6. The load weights are placed on the loading platform incrementally until the bridge fails. Thetesting judges decide how to load the weight and when to use either the 2 lb or 5 lb weightswhile loading.7. The maximum load that breaks the bridge is recorded.5

Test EquipmentTest RigFigure 5: Different views of the test rig.The testing rig is a frame made of 1 inch square steel tubing that stands 34 58 inches tall. The topof the frame consists of two arms, each with a 4x8 inch steel top plate and 4x13 inch steel sideplate welded to top outside and bottom inside of the arms, respectively, see fig. 5. The arm andplate assemblies act as abutments and have adhesive sandpaper attached to them to help keepbridges from moving while loading. The nominal abutment separation distance with sandpaper is17 15inches.16Loading HangerFigure 6: The steel plate and hanger bolt that make up the loading hanger assembly.The loading hanger consists of a steel plate with a 38 inch hole drilled through its center, see fig.6. Welded to the top of the plate and in-line with the hole is a washer and nut that a hook bolt isscrewed into.6

Figure 7: a) A top view of the load hanger attached to a bridge. b) A view down the span of abridge with the load hanger attached.The loading hanger is attached to the bridge by placing the steel plate flat on top of the deck withthe nut facing up. The nut hole is placed in-line with that of the road deck poster board hole, seefig. 7. The hanger bolt is then fed through the road deck hole from the bottom and screwed intothe nut.Loading PlatformFigure 8: The loading platform.The loading platform is used to support the load weight. It consists of two rectangular pieces of 34inch plywood fixed to one another by four eyebolts at the corners, see fig. 8. Each eyebolt has a 14inch braided nylon rope looped through it and fastened together at a steel hoop ring that hangsfrom the loading hanger.Loading WeightsFigure 9: The loading weights.The loading weights are used to apply a load to a bridge and are placed on the loading platformwhen hanging from the loading hanger. Two sized steel weights are used, a gold painted 2 lbweight and a black painted 5 lb weight, see fig. 9.7

Figure 10: A bridge spanning the two test rig abutments with the loading equipment attached andcarrying 2 lb and 5 lb weights.8

Bridge Inspection ChecklistCriteria19 24 inchesBridge Length:Bridge Height: 9 inches above deck 9 inches below deck 12 inches totalBridge Width:4 inches min6 inches maxDecking across the entire length of the bridge spanDeck capable of supporting weighted truck toyAssembly area clean/Tools and materials turned in9Acceptable

Idea Generating Guidelines1. Read this document thoroughly and watch the video at the listed link.(2012) gMgBjHBjcfo&feature time lapse) odFWmp6Sio42. Explore the internet for bridge building tips and other bridge building competitions. The Bridge Site - Bridge Design - ridges/Independent Modeling Instructions - ge/Independent Modeling Instructions - t Point Bridge Designer 2012 - See pages 5-6 for bridge building basics provided by the American Society of CivilEngineers (ASCE).4. Observe real bridges while traveling.Modeling Tips1. Remember, for a real bridge, the important part is the steel and/or concrete structure thatsupports the deck the cars drive on not the deck itself.2. A bridge needs to have a solid, stiff shape along its height, length and width. Meaning thestructure should not bend or twist when weight is place on it. For example, a Popsicle stick iseasier to bend along its flat side than along it edge.3. A bunch of sticks glued together flat, like a raft, have very little strength and will sag duringtesting under very little load (a weight placed on it).4. String as a structural member should always be in tension, in other words it should always bestretched.5. The strongest structural shape is the triangle. A bridge made of a series of triangles will bevery strong, see page 5.6. A bridge that is symmetrical is less likely to twist when loaded and will probably carry moreweight.7. A bridge built too tall will have a high moment of inertia, increasing stiffness and strength (agood thing). However, it may become unstable and topple when under a load (a bad thing).8. Care should be taken in the deck design to reinforce both the area where the loading platerests and the ends where the bridge rests on the test stand with bracing.10

Bridge TypesTied ArchArchBasket Handle ArchSuspensionTrussCable StayLoad PathCompression members shown in greenTension members shown in purple Strengthen areas where loads are connected.Connections Reinforce joints because bridges are only as strong as their connections.11

Stability Use triangular shapes to prevent rectangles from leaning/deforming.Members in compression such as the Top Chord will tend to buckle sideways duringloading and buckling can be prevented by using Top Lateral Bracing.Some bridges will twist along their length during loading. Twisting can be prevented byusing a "closed" shape such as a box or triangle as opposed to an "open" U-shape.Truss TypesPrattWarrenWarren with Inverted PrattCamelback12

If School is cancelled on Friday, Jan. 27 or dismissed early, the Battle of the Bridges will be cancelled and held on the alternate date of Feb.24 If the Putnam is closed on Saturday, Jan. 28 due to inclement weather, the d

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