强余震对主震受损重力坝非线性动态响应的影响

发布时间：2018-05-31 00:39

本文选题：混凝土重力坝 + 余震　；参考：《水利学报》2017年06期

【摘要】：大量震害实例表明,一次大的主震之后往往会引发大量的余震,而强余震将对结构产生额外的损伤累积破坏。本文中利用能考虑混凝土软化特性并可反映实际损伤耗散的混凝土塑性损伤本构模型,采用Lagrangian算法,考虑库水与大坝和地基之间的动态相互作用,并验证了耦合模型的可靠性;同时对单个主震、单个余震以及主余震序列作用下混凝土重力坝的损伤累积破坏效应进行分析,从大坝损伤、位移响应及损伤耗散能等方面探讨了强余震对主震受损大坝非线性动态响应行为的影响。结果表明,强余震对主震受损大坝的抗震性能具有重要的影响,为此需要提高大坝的抗震性能水平,在大坝抗震设计中应给予重视。
[Abstract]:A large number of earthquake damage examples show that a large number of aftershocks often occur after a large main shock, and strong aftershocks will cause additional damage and cumulative damage to the structure. In this paper, the plastic damage constitutive model of concrete, which can consider the softening characteristic of concrete and reflect the actual damage dissipation, is used. The dynamic interaction between reservoir water and dam and foundation is considered by Lagrangian algorithm, and the reliability of the coupling model is verified. At the same time, the damage cumulative failure effect of concrete gravity dam under the action of single main shock, single aftershock and main aftershock sequence is analyzed, and the damage of concrete gravity dam is analyzed. The effects of strong aftershocks on nonlinear dynamic response of damaged dams are discussed in terms of displacement response and damage dissipation energy. The results show that the strong aftershocks have an important effect on the seismic performance of the dam damaged by the main shock. Therefore, it is necessary to improve the seismic performance of the dam, which should be paid more attention to in the seismic design of the dam.
【作者单位】：武汉大学水资源与水电工程科学国家重点实验室;中国水利水电科学研究院流域水循环模拟与调控国家重点实验室;
【基金】：国家自然科学基金项目(51509189) 流域水循环模拟与调控国家重点实验室开放基金项目(IWHR-SKL-201611) 中国博士后基金项目(2016T90728) 长江科学院开放研究基金项目(CKWV2016383/KY)
【分类号】：TV312

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