【摘要】 为了研究高强度钢材压弯构件的滞回性能,首先采用有限元软件ANSYS中的壳单元SHELL181建立模型,对普通强度钢材箱形和工字形截面压弯构件在常轴力、水平往复荷载下的受力性能进行了模拟分析,模型考虑材料非线性、几何非线性、几何初始缺陷和残余应力的影响。通过与相关试验结果的比较,验证了有限元模型的正确性。在此基础上,分析了Q460和Q690钢材等边箱形压弯构件在常轴力、水平往复荷载作用下的受力性能,得到了其滞回曲线,同时研究了钢材强度对等边箱形截面压弯构件在强震循环荷载作用下滞回性能的影响。研究结果对钢结构抗震设计规范的完善以及高强度钢材的工程应用具有一定的促进作用。更多还原

【Abstract】 In order to study the hysteretic behavior of high strength steel columns,the shell181 element from the finite element analysis software-ANSYS was used to build model,with which the ordinary strength steel box and I-section columns subjected to constant axial force and horizontal cyclic loading were analyzed,and the influence of material nonlinearity,geometric nonlinearity,initial geometric imperfection and residual stress were considered in the finite element models.The finite element models had been proved to be accurate based on the comparison between results from the finite element analysis and experiments.Then,the finite element model was utilized to obtain the mechanical properties and hysteretic curve of high strength steel square box section columns under constant axial force and horizontal cyclic loading.An extensive parametric study was carried out to investigate the influence of steel strength on the hysteretic behavior of square box section columns under the cyclic loading of severe earthquakes.The research results will contribute to the improvement of steel structures seismic design codes and promote the engineering application of high strength steels.更多还原