新型卷边PEC柱-钢梁BRS板部分自复位连接组合框架抗震性能数值模拟

为研究新型卷边PEC柱-钢梁BRS板部分自复位连接组合框架的抗震性能,考虑T形件对穿螺栓布置方式、BRS板T形件长圆孔尺寸、PEC柱顶轴力、柱脚连接方式4个设计参数,利用有限元软件ABAQUS以1∶2缩尺比例建立5个框架模型并进行水平循环荷载下抗震性能的数值模拟.对比分析各设计参数对试件滞回性能、抗侧刚度退化、耗能能力、自复位功效等抗震性能的影响.分析结果显示:实验T形件单边对穿螺栓布置试件由于翘拔作用明显,极大程度延缓了自复位连接的受力发展进程,而实际工程T形件双边对穿螺栓布置可较好实现了自复位连接的设计思路;BRS板T形件长圆孔尺寸决定部分自复位连接的性态设计目标;柱顶轴力对试件初始刚度与承载力影响甚微,而后期二阶效应会加快自复位连接受力发展进程;所有试件中的PEC柱-钢梁BRS板部分自复位连接均能实现自复位功效、耗能能力和安全冗余度的有机统一.

Numerical simulation of seismic performance of new type crimping PEC column-steel beam composite frame with partial self-centering BRS energy-dissipating connection

To study the seismic performance of new type crimping PEC column-steel beam composite frame with partial self-centering BRS energy-dissipating connection, several design parameters as layout of penetrating bolts, BRS plate hole size of T-stub, axial force of PEC column, connection style at bottom of PEC column, 5 specimens’ models with 1∶2 scale was established by use of the finite element software ABAQUS to simulate under the lateral cyclic loading. The seismic performance of the hysteretic behavior, lateral stiffness, energy-dissipation capacity and self-centering function were analyzed. Research results showed that arrangement of bolts for test could make mechanical developing process be postponed, while practical engineering arrangement of bolts could make performance-based design target be achieved effectively; performance-based design target of partial self-centering connection was primarily depended on the slotted hole size of T-stub; the axial force of PEC column has little effect on the initial stiffness and bearing capacity, but behavior of partial self-centering connection was developed fastly by the second-order effect; sound coordination of self-centering function, energy-dissipation capacity and safety redundancy was achieved for partial self-centering connection used in all specimens.