Q460高强度钢材焊接T形截面压杆整体稳定性能研究

项目名称： Q460高强度钢材焊接T形截面压杆整体稳定性能研究

项目编号： No.51308194

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 建筑科学

项目作者： 熊晓莉

作者单位： 河南工业大学

项目金额： 25万元

中文摘要： 以高强度钢材在建筑钢结构中的应用为研究背景，采用理论分析与试验研究相结合的方法研究高强度钢压杆的整体稳定性能，属国际最新前沿课题之一。 主要研究内容包括：1）开展Q460高强度钢材焊接T形截面压杆极限承载力试验，获得钢材材性、构件几何初始缺陷及残余应力实测值，为理论分析提供依据；获得压杆极限承载力试验值，为验证有限元方法的正确性提供依据；2）通过考虑了实测初弯曲、初偏心以及残余应力等因素影响的压杆整体稳定性能数值分析，揭示高强度钢材焊接T形截面压杆整体失稳机理；3）利用基于简化初始几何缺陷及残余应力模型的有限元方法对不同尺寸的高强度钢材焊接T形截面压杆极限承载力进行计算，将其结果与现行规范的计算结果加以对比，提出高强度钢材焊接T形截面压杆整体稳定设计的合理化方法和建议。 研究成果可望解决高强度钢材焊接T形截面压杆整体稳定设计中的基本问题，为高强度钢材在建筑结构中的推广应用提供参考和依据。

中文关键词： 焊接T形截面压杆；Q460高强度钢材；整体稳定；静力试验；有限元分析

英文摘要： Application of the high strength steel in steel structures are taken as the research background of this project. Overall buckling behavior of high strength steel struts are studied through theoretical analysis and experimental study. That is one of the newest research topics in the world. The main content of this project is as following: 1) The specimens of Q460 high strength steel welded T-struts are tested to obtain the properties of steel, the initial geometric imperfection and sectional residunal stress for being used in the theoretical analysis. The specimens of Q460 high strength steel welded T-struts are tested to obtain the ultimate bearing capacity for verifying the FEA method. 2) Based on the FEA of T-struts with the initial bending, loading eccentricity and sectional residunal stress on the experimental results, the overall buckling mechanism of high strength steel welded T-struts is revealed. 3) By the numerical models with the simplification of initial geometric imperfections and residual stresses, the ultimate bearing capacity of high strength steel welded T-struts with different dimension are computed by the FEA method. Comparing the results of the Code with that of the FEA method, the design method and recommendations of the overall buckling of high strength steel welded T-struts will be proposed

英文关键词： welded T-strut；Q460 high strength steel；overall buckling；static test；FEA