地震和波浪作用下表面波条件对海水动水压力的影响

发布时间：2018-03-21 06:42

本文选题：表面波条件　切入点：地震　出处：《震灾防御技术》2017年01期 　论文类型：期刊论文

【摘要】：地震动斜入射条件下海洋场地简化为理想流体海水-两相介质海床-弹性固体基岩系统模型,通常假定为静水液面条件。本文以地震动SV波为例,推导了表面波条件下海洋场地动力反应解析解,研究了表面波条件对海水动水压力的影响。研究表明,表面波频率在大于0.5Hz时对海水动水压力几乎无影响,在小于0.5Hz范围内有影响,且越接近水面、频率越低时影响越显著。实际地震动卓越频率通常大于0.5Hz,因而地震动作用下采用忽略表面波条件的静水液面假定是合理的。进一步结合线性波浪理论,研究SV波和波浪联合作用下表面波条件对海水动水压力的影响。研究表明,由于波浪属于低频荷载且频率通常小于0.5Hz,在地震和波浪联合作用下表面波条件的影响较地震单独作用更为显著。
[Abstract]:The site was simplified as an ideal fluid two-phase medium elastic seabed seawater - solid bedrock under seismic dynamic system model of oblique incidence, it is usually assumed to be hydrostatic level conditions. This paper use the seismic SV wave as an example, the solution of dynamic site response analysis of ocean wave conditions is derived, studied the effect of surface condition on the dynamic sea water pressure. Research shows that surface wave frequency is greater than 0.5Hz in seawater on the hydrodynamic pressure has almost no influence, in the range of less than 0.5Hz, and the closer to the surface, the lower the frequency when the influence is more significant. The actual earthquake predominant frequency is usually greater than 0.5Hz, under the action of the hydrostatic level ignore wave conditions assumption is reasonable and ground motion according to the linear wave theory. Further, the combined effects of SV wave of waves and wave conditions of seawater hydrodynamic pressure. The results show that the wave is the low load The frequency is usually less than 0.5Hz, and the influence of surface wave conditions under the combined action of earthquake and wave is more significant than that of earthquake alone.

【作者单位】：北京工业大学城市与工程安全减灾教育部重点实验室;
【基金】：国家973项目(2011CB013600) 国家自然科学基金项目(51322813)
【分类号】：P315;P731.2;P75

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