腹板开孔型节点空间钢框架在低周反复荷载作用下的抗震性能研究  

Study on Seismic Performance of Space Steel Frames with Opening on Beam Webs Section Connections Under Low-Cyclic Loading

作　　者：石丹[1] 孟春辉 

机构地区：[1]长安大学建筑工程学院,陕西西安710061

出　　处：《石家庄铁道大学学报（自然科学版）》2017年第1期31-35,51,共6页Journal of Shijiazhuang Tiedao University(Natural Science Edition)

摘　　要：采用ABAQUS有限元分析软件对普通节点和腹板开孔型节点两种不同的节点形式建立三维的空间钢框架模型,进行有限元的模拟。对比分析了两种钢框架模型的破坏形式、承载力、滞回性能、耗能能力、强度及刚度退化性能。研究表明,腹板开孔型节点可使梁端塑性铰外移至梁端腹板开孔处,避免梁端焊缝处应力集中导致发生脆性破坏,增加了结构延性,但同时会降低结构承载能力;腹板开孔型节点等效粘滞阻尼系数与普通钢框架相比有明显的提高,进入屈服阶段后由于应力重分布,其刚度及承载力退化速度较普通节点钢框架较慢,腹板开孔型节点钢框架具有梁铰延性破坏机制,抗震性能较好。研究内容可为腹板开孔型节点在空间钢框架的应用和理论分析提供参考。In order to compare the seismic performance of the conventional connection steel frames and the opening on beam webs section connection steel frames ,three-dimensional finite element models of steel frames with two types of connections under low-cyclic loading are established utilizing ABAQUS software. Main properties including failure mode ,ultimate bearing capacity, hysteretic behavior, energy dissipation capacity, strength and stiffness degradation are evaluated on steel frames with these two types of connections. Analysis results show that the opening on beam webs joint can let the plastic hinge away from the welded connection of beam-column and avoid welded connection brittle fracture induced by the tie-beam stress connection. The equivalent viscous damping ratio of the opening on beam webs joint steel frame is obviously greater than the common joint steel frame,and when the steel frames enters the yield stage ,the stiffness and bearing degradation of the reduced joint steel frame is more slower for the stress redistribution. The opening on beam webs joints steel frame has a clear and ductile beam-hinge failure mechanism. The research contents can provide reference for the application and theoretical analy- sis of space steel frame with the reduced beam connections.

关 键 词：腹板开孔型节点 空间钢框架 ABAQUS 塑性铰外移 滞回性能 抗震性能 

分 类 号：TU391[建筑科学—结构工程]