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Bridge Project

CE 301 Presentation

Jason Forest

on 4 May 2010

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Transcript of Bridge Project

BOMB Design Criteria Minimum roadway width of 6”
Minimum vertical clearance of 6”
Maximum width and height of the structure at any point are 12” and 9”
Results Weight – 419.8 g
Load carried – 109.6 kg
Strength to weight ratio – 261
Deflection - 0.1 inches Design Analysis The loads path was distributed through the bridge deck and into the truss causing large compressive forces on the exterior beams Do trials of bridges
Improvements By: Byron Webb Jason Forest Josh Noveletsky Steve Diamond Taylor Wallace Inspiration The brittle failure occured when the intersecting substructure broke outside the reinforced bottom chord member
Proper glue bonding was not achieved when the upper slab of the deck was connected to the intersecting substructure; therefore, seperation occured at failure which induced improper load distribution
Utilize gussets (square and triangular plates) in the truss system Recognize that chords take comopressive and tension moments, while the web structure is under shear Aesthetics (coolness factor) Provide zero force members for redundancy in structure Honeycomb/intersecting the bridge deck Add reinforcements to the side of the bridge deck Add members to intersecting substructure Reduce zero force member Design Particulars The intersecting deck substructure was constructed to decrease weight by using thin balsa pieces while increasing strength due to a perpendicular grain arrangement and superflous construction Gussets were used to increase stength by maximizing the surface area for glue to adhear The addition of reinforced chord and frame members drastically increased the moment and shear capabilities of the structure The trusses were attached to the bottom of the deck to also increase the surface area for glue adhesion as well as properly distribute the loads throughout the entire structure A double layer Pratt truss (two levels of frames) was used to more closely resemble the moment diagram's triangular shape as well as create a square profile for each separate web which increases its stability Ensure that the top/bottom chords and the outside truss members where emphasized by using thicker beams while the interior web was constructed with thinner beams to decrease weight Failure also occured at the intersection between the top and bottom truss sections when the exterior beams broke due to hefty compressive forces Goals Design a unique bridge structure
Successfully create a truss bridge configuration
Meet design requirements
Build the best strength-weight ratio bridge Materials Superglue
A-grade Balsa wood
Exacto Knife
Dremel tool Use slower setting glue type Properly apply glue to all surface areas
Full transcript