论文部分内容阅读
为研究标准屈服强度为460 MPa的高强度钢材工字形截面轴心受压柱的局部稳定受力性能,采用通用有限元软件ANSYS建立有限元模型,考虑残余应力和局部初始几何缺陷的影响,与已有的460 MPa高强度钢材工字形截面轴心受压柱试验进行对比分析,验证了有限元建模方法的正确性。利用经过验证的有限元模型,针对460 MPa高强度钢材工字形截面轴心受压柱的局部屈曲性能进行有限元参数分析,并将已有试验结果、有限元参数分析结果,与中国、美国和欧洲钢结构设计规范中的设计曲线进行对比,提出新的设计公式。结果表明:钢板厚度、钢板长宽比、局部初始几何缺陷幅值和残余压应力值对构件翼缘极限承载力的影响很小,但对翼缘局部屈曲承载力有较大影响;所提出的建议设计计算公式相对于中国、美国和欧洲钢结构设计规范中的设计计算方法,更加适用于460 MPa工字形截面轴心受压柱极限应力和局部屈曲应力的设计计算。
In order to study the local stability of high-strength steel I-section columns subjected to standard yield strength of 460 MPa, a finite element model was established by using general finite element software ANSYS. Considering the influence of residual stress and local initial geometric defects, The existing 460 MPa high-strength steel I-section axial compression column test comparative analysis to verify the correctness of the finite element modeling method. The finite element analysis of the local buckling behavior of 460 MPa high strength steel I-sectioned column under axial compression was carried out with the finite element model verified. The experimental results and finite element analysis were compared with those of China, the United States and The comparison of the design curves in the European steel design code puts forward a new design formula. The results show that the influence of the thickness of the steel plate, the aspect ratio of the steel plate, the amplitude of the local initial geometric defects and the residual compressive stress on the ultimate bearing capacity of the member flange is small but the local buckling bearing capacity of the flange has a greater impact. The proposed design calculation formula is more suitable for the design and calculation of the ultimate stress and local buckling stress of 460 MPa I-section axial compression columns in comparison with the design and calculation methods in the steel structure design codes of China, the United States and Europe.