不同连接方式的不锈钢梁柱节点的抗震性能有限元分析

FEM Analysis on Seismic Behavior of Stainless-Steel Beam-Column Connections with Different Link Method

目的研究国内S316L不锈钢材料梁柱栓焊连接节点的承载性能及变形能力,比较不同种类螺栓(不锈钢螺栓A4-80、A4-70及达克罗8.8级)所对应的节点力学性能的差异.方法考虑不锈钢材料抗滑移系数较小,所以将摩擦型连接改进为承压型连接开孔受力,并分别对8 mm、12 mm、14 mm、16 mm的不同厚度不锈钢板材进行材性试验;通过数据处理得出材料精确的本构关系,根据S316L不锈钢材及3种螺栓材料本构关系,采用高效精确的有限元模型对不锈钢材梁柱节点在梁端施加循环往复荷载,进行循环加载下的受力性能模拟分析.结果延性系数最好的是达克罗8.8级所对应的节点,延性系数为4.2,另外两种螺栓对应的节点延性系数基本相同,都达到4.1,模拟结果与试验较符合.结论 3种螺栓对应的节点承载性能和抗震性能相差不大,综合考虑金属间腐蚀和价格等因素,建议选用A4-70螺栓应用于不锈钢梁柱栓焊节点中.

The domestic and overseas research of stainless-steel are mainly focused on material and component at present,and the research of beam-column connections are less.In order to study the resistance and rotation capacity of beam-column connections using stainless-steel S31608,and in the difference kinds of bolt（stainless-steel bolt A4-80、A4-70 and zinc-plated bolt 8.8）,flangewelded connections,efficient and accuracy FEMis proposed for numerical simulation under cycling loading based on the material stress-strain relationship of stainless-steel structure.The slipping coefficient of stainless-steel is smaller,so this paper use bearing connection instead of friction type connection to improve connection form.In addition the accuracy constitutive relation about 8 mm 、12 mm 、14 mm 、16 mm stainless-steel is obtained by material characteristic test.The result showthat ductility coefficient of zinc-plated bolt 8.8 joint is best,and the ductility coefficient is 4.2.Others are almost same and the ductility coefficient is 4.1.But the ductility coefficient of three types joint differ little.Comparison between FEA results and experimental data shows that nonlinear FEA method is satisfactory in simulating the behavior of bolt connections under low-cycle loading.SoA4-70 bolt can be required to applied to stainless-steel beam-column connections by considering corrosion and price.