钢筋混凝土框架近断层速度脉冲地震响应分析

采用有限元方法对近断层速度脉冲型地震动引起的钢筋混凝土框架结构的响应行为进行了初步研究。利用PKPM软件建立了3个不同层数的钢筋混凝土框架模型。使用SAP2000有限元软件并采用塑性铰模型，对框架结构在近断层地震动下的响应进行了数值模拟，并对比分析了有、无速度脉冲情况下的动力响应行为。同时，探究了近断层速度脉冲型地震动引起结构破坏的主要因素。研究结果表明：结构损伤或倒塌破坏的程度与速度脉冲型地震动的高频成分和峰值加速度有关；高频成分丰富的速度脉冲型地震动对结构的破坏更为明显；当框架结构进入塑性状态后，含有速度脉冲的地震动会引起结构更大的楼层位移和层间位移角。

Near-Fault Velocity Pulse Motions on Seismic Responses of the RC Frame

A behavior analysis on reinforced concrete frame structures under near-fault velocity-pulse ground motions is numerically performed by using simulation software and finite element method (FEM). Firstly, three frame models are established considering the effects of different heights by PKPM software. Then, the FEM, together with the plastic hinge model, is applied to simulate numerically the whole process of dynamic responses on the structures suffered with near-fault motions, and the effects of velocity pulse and non-pulse motions are compared. Finally, the damaging factors of the velocity pulse are demonstrated. The results show that the structural damage degree is related to the high-frequencies and the peak ground accelerations of velocity pulse motions. Moreover, when seismic responses of structures step into the plastic stage, the structural responses to the ground motion with velocity pulse are increased by considerable magnitudes compared to the motions without velocity pulses.