长圆孔腹板耗能梁段抗侧刚度及极限承载力计算分析

CALCULATION AND ANALYSIS OF LATERAL STIFFNESS AND ULTIMATE BEARING CAPACITY OF LINK BEAM WITH SLOTTED-HOLE WEB

连梁是连接双肢剪力墙结构的主要构件,为了控制连梁在地震作用下进入塑性的部位,便于震后修复,可将连梁跨中部截面削弱,此段梁称作耗能梁段。地震作用下耗能梁段首先进入塑性耗能状态,为了使耗能梁段较早进入塑性耗能状态,提出了腹板开长圆孔型耗能梁段。通过ABAQUS有限元软件分析各参数下其刚度、承载力、延性、滞回性能及破坏形态,提出了其初始刚度和极限承载力计算方法。分析结果表明:长圆孔腹板耗能梁段具有良好的滞回性能,可实现屈曲前屈服;孔间柱长宽比β是影响耗能梁段承载力和滞回性能的决定因素,双列孔耗能梁段性能优于单列孔;考虑上、下翼缘对耗能梁段影响的初始刚度和极限承载力计算结果与有限元结果较为吻合。

Coupling beam is the main component for connecting the coupled shear wall structure. In order to control the plastic part of the coupling beam under earthquake action to repair easily after earthquake,the cross section of the coupling beam will be weakened,and reffered to as link beam. Under seismic action,the link beam first occurs to the plastic energy dissipation,in order to make the link beam engender plastic energy consumption earlier,a new type of link beam with slotted-hole web was proposed. The stiffness,bearing capacity,ductility,hysteretic behavior and failure mode of each parameter were analyzed by ABAQUS finite element software and the calculation method of initial stiffness and ultimate bearing capacity were proposed. The analysis results showed that： the link beam with slotted-hole web had good hysteretic behavior and the pre-buckling yield could be achieved; the length width ratio β of hole was the most important factor that affected the bearing capacity and hysteretic behaviour of link beam,the performance of link beam with two-row holes was better than that of link beam with single row hole; the calculated results of initial stiffness and ultimate bearing capacity considering the influence of flange on the link beam section were in good agreement with the finite element results.