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Bridge Forces

Bridge Forces

Executive Summary

1.  Problem Statement:
	
	In this case, I was tasked to analyze a truss system.  The main focus of this analysis was to inform a general contractor whether a model for a particular bridge was oversimplified.  The contractor was worried that the model for the bridge was oversimplified because it neglected the member weight.  In the first part of the problem I was required to analyze the structure by neglecting the member weights, but adding a simulated truck load on the bridge.  In the second portion of the problem, I removed the truck weight and analyzed the bridge using the actual member weights.  In my problem, the member weights were 850 lbs a piece and they were each 17 feet long.

2.  Assumptions:

The first step I had to take to analyze this bridge was to make a few initial assumptions.  First, I assumed that the truss was loaded only at the joints.  I also assumed that the members were joined by frictionless pins.  In the first part of the problem, I also had to assume that the member weights were negligible.  I also assumed that the load (P) was all at

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