带不等高梁的外传力式钢管柱框架节点性能分析

Performance Analysis on Steel Frame Joints Transferring Forces outside Rectangular Columns with Unequal Beam Height

在钢框架结构中,梁柱节点是最为复杂且最为重要的部分。利用有限元软件ANSYS建立了3组不同梁高差的钢管柱框架节点模型,对同时加设上下传力件的钢管柱框架节点进行受力性能分析,并与仅加设上传力件的节点和传统常规节点进行对比,通过对荷载-位移曲线、von Mises应力分布等方面的分析,讨论加设传力件对改进钢框架节点工作性能的作用。结果表明,仅加设上传力件对节点域受力性能改善并不明显,当同时加设上下传力件后,节点部位刚度、屈服承载力和极限承载力显著提高,并能保证节点部位良好的塑性变形能力,避免节点先发生破坏,有效实现柱外传力。

The beam column joint of moment resisting frame is the most important and complex component of steel frame structures. Utilizing ANSYS software, three sets of joints transferring forces outside rectangular columns with unequal beam height are modeled in this paper, and the analysis results of ioints with upper and lower force-transferring elements are compared with those of conventional joints and those of joints only with upper force transferring elements by numerical simulation. Load displacement curves, distribution of von Mises stresses and stress path are evaluated. The analysis results show the influence by adding force-transferring elements. It also shows that only adding upper force-transferring elements does not improve the performance of steel frame joints significantly. Through adding upper and lower force transferring elements, the stiffness, yielding bearing capacity and ultimate bearing capacity of joints are increased significantly. This can ensure sufficient plastic deformation capacity, thus the premature brittle fracture near butt weld with high stresses is prevented.