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采用黏弹性边界结合等效荷载的输入方法来实现斜入射地震动输入,研究平面P波倾斜入射时河谷两岸地震动响应情况.结果表明:地震波斜入射时,河谷两岸的动力响应与垂直入射相比有较明显差异;地震波入射角度、地形条件等对河谷两岸地震动影响显著,河谷屏蔽和隔振效应造成的影响不可忽略;P波倾斜入射时,随着入射角度增加,河谷两岸竖向位移逐渐减小,水平向位移逐渐增加;地震波以一定角度入射时,河谷两岸的竖向加速度不随高程线性变化,而存在局部波动,对于不同形状的河谷,其两岸的竖向加速度变化规律差别较大;河谷两岸的水平向加速度变化与地形条件及入射角度等因素密切相关,规律不明显.
The input of viscoelastic boundary combined with equivalent load is used to realize the input of oblique incident ground motions and to study the response of ground motions along the banks of the valley when the plane P waves are obliquely incident.The results show that when the seismic waves are obliquely incident, Compared with the obvious difference; seismic wave incident angle, topography and other conditions on the impact of the two sides of the river valley significant impact, valley shielding and vibration isolation effect can not be ignored; P wave tilt incident, with the incident angle increases, And the horizontal displacement gradually increases. When the seismic wave is incident at a certain angle, the vertical acceleration along the banks of the valley does not change linearly with elevation, but fluctuates locally. For the valleys with different shapes, the vertical acceleration variation between the two banks is quite different The variation of horizontal acceleration along the banks of the river valley is closely related to the topographic conditions and the angle of incidence. The laws are not obvious.