دانلود رایگان مقاله مقاومت نهایی بخش جعبه اعضای فشاری پل فولادی در مقایسه با مشخصات

Abstract

Initial distortion and residual stress are well known as the most important initial imperfection factors and have a significant effect in decreasing the ultimate strength of compression members. The present work focuses on predicting the ultimate strength of welded box section steel compression members regarding initial imperfection factors. Beam compared with shell type of Finite Element (FE) models varied in slenderness ratio and initial distortion are used to assess the accuracy of present numerical results. The comparison of result between FE models and design strength formulations in some specifications are used to assess the ultimate strength formulations of bridge specifications according to the behavior of current steel compression members. It can be observed from numerical results that FE models and design strength by JSHB 2012 and AISC 2005/AASHTO 2010 have good agreement each other which means that the specifications have good capability in assessing the ultimate strength of steel compression members. Parametric study of the ultimate strain varied in slenderness ratio and load versus displacement curves of compression members are also introduced in order to perform more detail steel columns displacement behaviour. Finally, present work proposed a flowchart in designing steel compression members with the expectation that it will be helpful as reference for researchers and engineers in practical fields.

Conclusion

Many studies related to the ultimate strength of compression members have been conducted in order to develop newer and more suitable criteria for current engineering requirements. Hence, the present study considers compression ultimate strength of welded box section steel columns regarding initial distortion and residual stress as initial imperfection factors. From numerical study results, FE models created in present paper can accurately simulate the ultimate strength of steel compression members. The comparison between FE result and ultimate design strength by JSHB 2012 and AISC 2005/AASHTO 2010 shows that the specifications can predict sufficiently safe results for ultimate strength of steel compression members.Conclusion Many studies related to the ultimate strength of compression members have been conducted in order to develop newer and more suitable criteria for current engineering requirements. Hence, the present study considers compression ultimate strength of welded box section steel columns regarding initial distortion and residual stress as initial imperfection factors. From numerical study results, FE models created in present paper can accurately simulate the ultimate strength of steel compression members. The comparison between FE result and ultimate design strength by JSHB 2012 and AISC 2005/AASHTO 2010 shows that the specifications can predict sufficiently safe results for ultimate strength of steel compression members.