ABSTRACT

Reinforced concrete intake towers are considered as main hydraulic structures constructed in dams’ reservoirs, connected to the dam or as a separate structure. If an intake tower is damaged, the powerhouse or downstream of the dam may experience serious problems. In this research, the influence of mainshock-aftershock seismic sequences is studied on real intake tower. The intake tower of Encino dam is modeled by using the finite element method. The dynamic time history analyses are conducted with the real as-recorded earthquakes and the nonlinear behavior of concrete and steel bars is considered. The tower is modeled with reservoir and foundation, and their interactions are considered. The earthquake records are applied to the tower in three cases: (i) one horizontal component, (ii) two horizontal components, and (iii) two horizontal components with vertical component. The main dynamic responses of the tower including relative deflections and nonlinear material responses are presented. The obtained results are discussed, and the influence of the main shock-aftershock sequences are thoroughly examined.

摘要

钢筋混凝土进水塔被认为是大坝蓄水池中建造的主要水工结构，与大坝相连或作为单独的结构。如果进水塔损坏，发电厂或大坝下游可能会遇到严重问题。本研究主要研究了主震-余震序列对实际进水塔的影响。恩西诺大坝进水塔采用有限元法建模。动态时程分析是用真实记录的地震进行的，并考虑了混凝土和钢筋的非线性行为。该塔采用水库和基础建模，并考虑了它们的相互作用。地震记录在三种情况下应用于塔：（i）一个水平分量，（ii）两个水平分量，(iii) 两个水平分量和垂直分量。介绍了塔的主要动态响应，包括相对挠度和非线性材料响应。讨论了获得的结果，并彻底检查了主震-余震序列的影响。