截面参数对钢框架改进型节点损伤影响研究

The Effect of Section Parameters on Damage Analysis of Modified Joints in Steel Frames

为研究工字钢截面参数对钢框架梁柱改进型节点的损伤影响,采用有限元软件建立了三维全焊接节点模型,与国内试验结果进行对比,验证了模型的准确性及适用性。钢材采用循环本构模型,分析了循环荷载作用下翼缘宽厚比和腹板高厚比对节点损伤退化的影响。结果表明:翼缘宽厚比对退化程度和退化速率影响较大,对起始退化位置影响较小;腹板高厚比对起始退化位置影响较大,高厚比越大,起始退化越早;在翼缘腹板面积比相近的情况下,退化基本一致,但当翼缘腹板的相互约束作用减弱时,退化程度会明显加强。

3D welded joint models are built to analysis the effect of section parameters on the damage of modified beam-to-column joints in steel moment frame,the models are proved to be correct and applicable by comparing with test data.The steel cyclic constitutive model is used to analyze the effect of width-to-thickness ratio of flange and height-to-thickness of web on the damage degradation of joints.The results show the width-to-thickness ratio of flange has significant impact on the degradation value and speed,but has little impact on the initial degradation position.The height-to-thickness of web has large influence on the initial degradation position,a larger ratio causes earlier degradation appeared.In the case of the area of flange is similar to web,the degradation condition is similar.But if the interaction of flange and web is weakened,the degradation increases obviously.