为研究近断层脉冲作用对斜拉桥地震响应的影响，在研究近断层地震动特性的基础上，利用最小二乘法进行脉冲模型数值拟合，通过等效模态法将复杂斜拉桥在纵桥向简化为单质点体系，建立、求解近断层脉冲作用下斜拉桥纵桥向的运动微分方程，得到斜拉桥塔顶位移、塔底弯矩与速度脉冲周期及幅值的解析关系，由此得出结构地震响应随脉冲参数变化的规律，并分别通过独塔和双塔斜拉桥的有限元分析对该方法的正确性进行验证，结果表明该方法简单可行，误差在工程可接受范围内．

In order to investigate the effect of near-fault pulsed ground motions on cable-stayed bridges，the charac-teristics of near-fault pulsed ground motions are analyzed and are fitted to different numerical pulse models by means of the least square method． Then，the complex cable-stayed bridge is simplified into a system with single degree of freedom in longitudinal direction via the equivalent modal method，and the dynamic differential equations of the ca-ble-stayed bridge subjected to near-fault pulsed ground motions are therefore established and solved． Meanwhile，the analytical relationships between the top displacement as well as the bottom moment of the tower and the period as well as the amplitude of the pulse velocity are obtained to further reveal the general law of bridge seismic respon-ses varying with pulse parameters． Finally，finite element analyses of both single-tower and double-tower cable-stayed bridges are carried out to verify the accuracy of the proposed method． The results indicate that the method is of simplicity，feasibility and an acceptable error．