960MPa高强度钢材轴压柱局部稳定性能及设计方法

发布时间：2018-06-12 04:38

本文选题：高强度钢材 + 轴心受压　；参考：《湖南大学学报(自然科学版)》2017年01期

【摘要】：为研究960 MPa(屈服强度标准值)高强度钢材轴心受压构件的局部稳定受力性能,本文使用ANSYS软件建立有限元模型,对4个箱形截面和4个工字形截面轴心受压构件进行了有限元分析.模型考虑了几何初始缺陷及焊接残余应力的影响,提取构件的极限承载力和局部屈曲临界承载力的有限元计算结果与试验实测结果进行对比,验证了模型的有效性.利用这种建模方法,对960 MPa高强度钢材箱形和工字形轴心受压构件的局部稳定受力性能进行了有限元参数分析,并将有限元计算结果,以及本文汇总的已有试验结果,与中国、美国和欧洲的钢结构设计规范中轴心受压构件的设计曲线进行了对比,并提出了新的设计公式.结果表明,本文使用的有限元建模方法能够准确地分析计算960 MPa高强度钢材轴心受压构件的局部屈曲受力性能;几何初始缺陷和残余应力对构件的极限应力的影响很小,但是对板件宽厚比较大构件的局部屈曲应力的影响相对较大;相对于中美欧现行钢结构设计规范中的设计方法,本文提出的设计公式更适用于960 MPa高强度钢材轴心受压构件的局部屈曲应力和屈曲后极限应力的设计计算.
[Abstract]:In order to study the local stable mechanical behavior of 960 MPA (yield strength standard value) high strength steel axial compression members, a finite element model is established by using ANSYS software. Four axial compression members with box section and four I-section are analyzed by finite element method. The effects of initial geometric defects and welding residual stress are considered in the model. The finite element calculation results of the ultimate and local buckling critical bearing capacity of the components are compared with the experimental results, and the validity of the model is verified. Using this modeling method, the finite element parameter analysis of the local stability of 960 MPA high strength steel box-shaped and I-shaped axial compression members is carried out, and the results of finite element calculation, as well as the experimental results summarized in this paper, are compared with those of China. The design curves of axial compression members in the steel structure design code of the United States and Europe are compared and a new design formula is put forward. The results show that the finite element modeling method used in this paper can accurately analyze and calculate the local buckling behavior of the axial compression members of 960 MPA high strength steel, and the initial geometric defects and residual stresses have little effect on the ultimate stresses of the members. However, the effect on the local buckling stress of large members with wide and thick plates is relatively large, and compared with the design methods in the current codes for steel structure design in China, America and Europe, The design formula presented in this paper is more suitable for the design and calculation of local buckling stress and post-buckling ultimate stress of 960 MPA high strength steel under axial compression.
【作者单位】：土木工程安全与耐久教育部重点实验室清华大学土木工程系;
【基金】：国家自然科学基金资助项目(51478244);国家自然科学基金优秀青年基金资助项目(51522806)~~
【分类号】：TU391

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