近断层地震动较远场地震动具有频率高、速度快、能量更加集中的特点，在短时间内会释放大量能量，对工程结构具有严重危害。规范提供的加速度分布系数不适用于高度超过150m的大坝，随着技术不断进步，我国超过150m的土石坝越来越多，规范已不能满足现有需求。本文基于台湾集集近断层地震动记录，建立随机脉冲型地震动模型，分别对高度为40、70、150和200m的土石坝进行随机动力分析，研究坝体的动态分布系数。结果表明：近断层地震动的低频速度脉冲使坝体的加速度反应谱有较宽的敏感段，易覆盖坝体自振周期，显著增加坝体的加速度。本文通过总结近断层区域土石坝的加速度分布规律，建议了近断层脉冲型地震动区域的土石坝坝体动态分布系数，为近断层高地震风险情况下土石坝的抗震理论和方法提供参考。
Abstract
In order to study the acceleration distribution of earth-rock dams under near-fault pulse ground motion, a random ground motion model was established based on the records of near-fault pulse ground motion in Jiji, Taiwan, and the random dynamic analysis of earth-rock dams with different heights was conducted to study the dynamic distribution coefficient of the dam body. The results show that the low frequency velocity pulse of ground motion near the fault makes the acceleration response spectrum of the dam body have a wide sensitive section, which easily covers the natural vibration period of the dam body and significantly increases the acceleration of the dam body. By summarizing the acceleration distribution law, the dynamic distribution coefficient near the fault seismic area is suggested, which can provide reference for seismic resistance of earth-rock dam.
关键词
近断层地震动 /
随机模拟 /
高土石坝 /
加速度分布
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Key words
Near-fault pulse type ground motion /
Random simulation /
High earth-rock dam /
Acceleration distribution coefficient
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参考文献
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