D型偏心支撑钢框架耗能梁段性能分析  

Performance analysis of energy dissipation of steel frame with D type eccentric braced

作　　者：胡含笑 邵宝东[1] 王丽凤[1] 杨洋[1] 

机构地区：[1]昆明理工大学建筑工程学院,昆明650500

出　　处：《土木建筑与环境工程》2016年第S1期101-107,共7页Journal of Civil,Architectural & Environment Engineering

基　　金：国家自然科学基金(11462010)

摘　　要：D型偏心支撑是广泛应用于钢框架偏心支撑结构中的耗能形式之一。它是在中心支撑结构基础上改良的一种钢框架支撑形式,它不但继承了中心支撑钢框架抗侧移刚度和强度大的优点,还结合了抗弯钢框架结构中梁柱节点的良好的的抗弯性能;同时又解决了中心支撑框架中支撑斜杆重复压屈后抗压承载力降低从而导致延性差等问题,即通过支撑斜杆至少有一端与梁相连从而在梁端形成的耗能梁段来耗散地震能量,从而保证支撑不先发生受压屈曲。本文采用理论分析与有限元分析相结合的方法,先用虚功原理对耗能梁段与钢框架的承载力关系做出了推导,然后用ABAQUS有限元软件对8种具有不同耗能梁段长度的D型偏心支撑钢框架建立有限元模型,进行非线性有限元分析。通过偏心支撑极限承载力和滞回性能的对比分析,表明了耗能梁段的长度的最佳长度范围。耗能梁段过长或者过短都会导致整体结构的抗震性能越差。最后根据有限元分析结果提出了对耗能梁段长度的建议。D type eccentrically braced steel frame is widely used and eccentric support structure in the form of energy consumption.It is a frame work modified on the basis of center support structure.It not only inherits the advantages of strength and stiffness of the lateral braced steel frame,but also incorporates bending steel frame structure beam-column joints good bending performance.At the same time solve the center support framework supporting diagonal compressive bearing capacity after repeated bucking reduced resulting in poor ductility,Namely by supporting diagonal at least one end of link beam is connected with the beam at the end of the beam thus formed to dissipate seismic energy,Thus ensuring not support compression buckling occurs first.In this paper,the method combining the theoretical analysis and finite element analysis is used.Firstly the principle of virtual work for bearing capacity of link beam and steel frame is derivated.And then the finite element software ABAQUS is used to establish the eight different energy beam length of the finite element model and Nonlinear finite element is analyzed.Through the eccentric support the ultimate bearing capacity and hysteretic performance comparison and analysis,Showthe energy dissipation beam section of the length of the range of optimum length.Energy beam section is too long or too short will cause the seismic performance of the overall structure get worse,Energy beam section is too short make the greater the plastic deformation,At last,the energy beam length according to the finite element analysis results is suggested.

关 键 词：偏心支撑 钢框架 耗能梁段 有限元分析 

分 类 号：TU391[建筑科学—结构工程]