Truss and Design

Stevens Institute of Technology | Planar Truss | Project 1 | Engineering Design III – E 231 – Section D – Group 7 | | 11/9/2010 |

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Abstract
The planar truss was constructed according to the requirements of the E231 by attempting to support a large load. Three designs were constructed to fit the necessary requirements. The design with the largest strength to weight ratio was chosen. The truss was then constructed using square brass tubing and then tested for the strength by applying a vertical load with a buster. The goal of the project is to make a truss to hold the most load out of the whole class.

Table of Contents
Abstract i
Introduction 1
Discussion 2
Design 2 Overview of design process 2 Truss Design Details with Alternative Designs 3 Design Analysis Summary 6 Calcuations of weakest member and strength to weight ratio 6 Fabrication Concerns 6
Fabrication 7 Assembly techniques and soldering considerations 7 Finishing and final weight of the truss in pounds 8
Results 8 Type of failure and rational for the test results 8 Ranking within your section 8 Ratio of Load failure (lb.) to truss weight (lb.) 8 Test results compared to predicted load failure and predicted failure member(s) 8
Conclusions and Recommendations: 8
Appendix A 9
Planar Truss Gantt Chart 9
Work Breakdown Structure 10
Appendix B 12
Final Design Calculations 12
Truss Before Testing 13
Truss after testing 14
Appendix C 14
Brass Compression data 15

Introduction
The single planar truss was constructed according to the requirements of the E231 class. The truss was constructed in goal of having maximum strength to weight ratio when a vertical load was applied to the center of the truss. The groups were split up into 3 or 4 people each where each group competes against one another to get the largest strength to weight ratio. This means that the truss would hold a heavy