Lab #4 -Measuring forces in Truss Members Using Strain Gages

Lab #4 -Measuring forces in Truss Members Using Strain...

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Measuring Forces in Truss Members Using Strain Gages CE 206 (C.E. Lab #4) Conducted: February 25 th , 2010 Submitted to: Prof. Brown, March 11 th , 2010 Tom Wienckowski Lab Group C Members: Andrew Dougan Kyle Fischer Matt Smith
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Table of Contents Page Abstract 3 Introduction 4 Methods and Procedures 4 Results and Discussion 6 Conclusions 11 Appendix 12 2
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Abstract Trusses are used in many different engineering applications. The objective of this lab was to experimentally determine the internal forces in simple structures, and to compare those results with values obtained analytically. The three separate trusses were tested in the Tinius-Olsen testing machine one at a time. The six strain gages from each truss were connected to the strain indicator and the data was recorded. The results were accurate for the trusses showing that certain members were in tension while others were in compression. The data will be used to compare the analytical results to the experimental results. 3
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Introduction Different trusses are used for various different applications in construction and engineering. Since trusses are so often used in the engineering field, their engineering properties are very important. The amount of tension and compression different members in a truss can hold is an important factor for different trusses. The objective of this lab was to experimentally determine the internal forces in simple structures, and to compare those results with values obtained analytically. The data that was gathered from the Tinius-Olsen testing machine was then used to show the accuracy for each concrete cylinder that was prepared in the lab. These objectives were achieved by testing the trusses in lab, and comparing the forces analytically to the forces found experimentally in the lab. Methods and Procedures There were three separate pin-connected triangular trusses, with strain gages and constructed from 1018 steel, provided in the lab. A 30-60-90 truss, a 45-45-90 truss, and a 60-60-60 truss were used. First the cross-sectional dimensions and the length of each member and pin were carefully measured and recorded. Also the strain gages were checked for and broken leads. The load to cause yielding of the most severely stressed member of each truss was theoretically calculated. The force to cause failure in the pin connections was also calculated. Next the critical buckling load for the truss was theoretically calculated. The calculations were done previous to the lab. A truss was set up in the Tinius-Olsen Testing machine. It was made sure that loads and reactions were 4
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applied at truss joints and that they do not interfere with the members. The strain gages
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This note was uploaded on 06/08/2010 for the course CE 342 taught by Professor Brown during the Spring '10 term at Widener.

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Lab #4 -Measuring forces in Truss Members Using Strain...

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