| Summary: | 碩士 === 朝陽科技大學 === 營建工程系碩士班 === 89 === Due to the variety of cross sectional shape for cold-form steel members, for the practice reason it is not normally possible or convenient to connect each element to the end connection. Therefore, the shear lag effect will be occurred for the member subjected to tension. This effect reduces the strength of the member because the stresses distributed in the entire section are not uniform.
It is found that the design formulas for calculating the cold-formed steel tension members according to most specifications of several countries do not consider the shear lag effect. Therefore, this study is concentrated on the investigation of the shear lag effect on the cold-formed steel tension members. Channel specimens with different dimensions tested by using bolted connection were discussed in this study. The comparison was also made between the test results and predictions computed based on several specifications. In order to study the stress distribution in the various location of any cross section of specimen, the finite-element software ANSYS was also conducted in this research.
Base on the experimental results, it was found that the tension strengths of test specimens predicted by the AISC-Code (1993), which takes account of shear lag effect, are more closely to the test values. The predictions according to AISI-Code (1996) and AS/NZS 4600 Code (1996) seem to be overestimated as compare to the test results. It is also noted that there are quite discrepancy between the test results and the values predicted by British Standard (1998) and LaBoube recommended equation.
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