【摘要】 为研究近断层地震动特性及其入射方向对边坡地震响应的影响,首先,考虑边坡对地震波的散射规律,提出了一种能够考虑地震波任意角度入射的地震动输入方法,该方法能够准确考虑模型边界两侧的动力相互作用且简单易操作。其次,运用提出的地震动输入方法,通过有限元参数分析研究了地震波入射角对边坡地震响应的影响规律。结果表明:当同时考虑P波及SV波入射时,由于两种波形的叠加作用,边坡的放大效应较一种波形单独作用时更加显著,且坡面上加速度分布更不均匀。地震波的入射角能够显著影响边坡的地震响应,随着地震波入射方向与坡面间夹角的增加,边坡对地震动的放大效应越明显,坡面上加速度分布越不均匀。更多还原

【Abstract】 Therefore, the aim of this study is to investigate the influences of the characteristics and incident angle of the near-fault ground motion on the seismic response of slopes. First, based on the propagating law of seismic waves near slopes, an earthquake input method was proposed for seismic analyses of slopes subjected to obliquely incident waves. The proposed method can accurately consider the dynamic interaction between the two sides of the model at boundaries. Then, a parametric study was conducted to study the influence of the incident angle on the seismic response of slopes. The results show that when both the SV and P waves are applied, the amplification effect of the slope is more significant owing to the superposition of SV and P waves. Besides, the distribution of the acceleration at the slop becomes more non-uniform. The incident angle of the input motion has a significant effect on the seismic response of slopes. Moreover, as the angle between the incident direction and the slope surface increases, the amplification effect of the slope becomes more significant.更多还原