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混凝土拱坝阻尼特性的数值试验初步研究

发表时间:2009-02-28  浏览量:1606  下载量:601
全部作者: 寇立夯,金峰
作者单位: 清华大学水沙科学与水利水电工程国家重点实验室
摘 要: 对拱坝原型激振试验和强震分析得到的阻尼值进行了分析,并通过数值试验对混凝土拱坝结构阻尼随激震强度的变化规律进行了分析研究。结果显示:微震情况下,由于横缝被库水压紧,拱坝仍表现为线弹性状态;强震情况下,拱坝横缝张开会使得坝体刚度降低,进而导致自振频率有所下降。同时横缝开合过程中的能耗使得系统阻尼增加,共振时的峰值响应会有所降低;强震情况下材料的塑性变形同样会导致频率的降低和阻尼的增加。
关 键 词: 水工结构;阻尼比;拱坝;动力反应强度
Title: Preliminary research on the damping properties of concrete arch dams by numerical experiment
Author: KOU Lihang, JIN Feng
Organization: State Key Laboratory of Hydroscience and Hydraulic Engineering, Tsinghua University
Abstract: This paper analyzes the damping values obtained from prototype dynamic test and strong earthquake analysis of arch dam. Then it studies the relation between the damping ratio and dynamic reaction intensity of concrete arch dam structure through numerical experiment. Computed result indicates that when the dynamic reaction intensity is lower, the arch dam behaves linear for the compaction of its contraction joints. But in the case of strong earthquake, the characteristic frequency of arch dam decreases as the opening of contraction joints. At the same time, damping ratio increases and peak response of resonance decreases because a large amount of energy is consumed in the moving process of contraction joints. The same phenomena can be observed when the dam concrete is damaged in case of strong earthquake.
Key words: hydraulic structure; damping ratio; arch dam; dynamic reaction intensity
发表期数: 2009年2月第4期
引用格式: 寇立夯,金峰. 混凝土拱坝阻尼特性的数值试验初步研究[J]. 中国科技论文在线精品论文,2009,2(4):316-321.
 
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