带LYP160钢连接组件的扩翼型盖板连接节点抗震行为研究  

SEISMIC BEHAVIOR OF WIDENED FLANGE CONNECTIONS WITH LYP160 STEEL COMPONENTS

作　　者：王萌[1] 柯小刚 WANG Meng;KE Xiao-gang(School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China)

机构地区：[1]北京交通大学土木建筑工程学院

出　　处：《工程力学》2019年第8期149-160,共12页Engineering Mechanics

基　　金：国家自然科学基金项目(51778042);北京市自然科学基金项目(8182042)

摘　　要：为在新型城镇化进程中推广使用带有震后可更换构件的结构体系,对钢框架体系中带低屈服点LYP160钢材盖板连接组件的节点进行梁柱连接部位扩大梁翼缘截面的改进,提高节点承载能力及“保险丝”作用效果。采用通用有限元软件ABAQUS建立全螺栓连接节点数值模型,结合国内外典型试验结果,验证数值模型的准确性和适用性。通过建立不同扩翼程度、不同削弱程度的盖板连接节点模型,对比其承载性能、滞回性能、断裂性能以及耗能能力等,深入探讨不同扩翼程度对不同削弱程度的扩翼型盖板连接节点抗震行为的影响,并给出此类节点的设计流程,为工程应用提供参考依据。研究结果表明:扩大梁端翼缘截面可增加盖板连接组件耗能,减少主体结构进入塑性程度及耗能比例,有效转移塑性铰位置,提高节点“保险丝”作用效果及作用时间;随着扩翼程度的增大,节点所需的承载力系数设计值提高,使节点避免过度削弱,兼顾正常使用承载能力及可更换“保险丝”作用,但当扩翼达到一定程度后,对盖板连接组件耗能比例的提高作用有限;基于计算结果拟合得到节点承载力系数限值与扩翼系数的关系曲线,为保证“保险丝”作用充分发挥,应保证承载力系数设计值小于承载力系数限值,扩翼型节点的承载力系数限值比未扩翼型节点提高22%,实现对节点进行较小削弱就能充分发挥“保险丝”作用效果的目标。To promote structural systems with replaceable components in the new urbanization process,connections with LYP160 steel cover-plate components in steel frame systems were improved by widening the beam flange section to increase the bearing capacity and fuse performance.A numerical model of full-bolted connections was established by using ABAQUS and was proven correct and applicable due to test results at home and abroad.Subsequently,cover-plate connection models with different degrees of widening and weakening of the flange were established.The load-carrying capacity,hysteretic behavior,fracture performance and energy dissipation capacity were compared,and the influence of the degree of widening on the seismic behavior of widened flange cover-plate connections with different degrees of weakening was discussed in depth.Finally,a design procedure was proposed to provide a basis for engineering application.The analysis results showed that widening the beam flange section can reduce the energy dissipation of the main frame and increase that of the cover-plate components.Widening the flange can also effectively transfer the position of the plastic hinge,and improve the effect and time of fuses.With the increase in the widening,the required design value of the bearing capacity was improved,which avoided excessive weakening and guaranteed the bearing capacity for normal use and the replaceable function of fuses.When the degree of widening reached a certain value,the influence of widening on the increase in the energy dissipation of cover-plate components was limited.Based on the calculation results,a relation curve of the limit value of bearing capacity coefficient and the widened flange coefficient was obtained.To ensure the full play of fuse,the design value of the bearing capacity coefficient should be less than the limit value,and the limit of the bearing capacity coefficient of the widened flange connection was 22% higher than that of the unwidened flange connection,indicating that the fuse effect will adequately e

关 键 词：低屈服点钢材(LYP) 盖板连接组件 钢框架节点 保险丝 扩翼 

分 类 号：TU391[建筑科学—结构工程]