【摘要】 大头坝的横向抗震问题十分重要,但抗震分析也很困难,迄今都只采用单坝段或几个坝段进行横向抗震分析。 本文结合湖南镇大头坝工程的横向抗震研究,建议了将大坝各坝段作为整个体系考虑的有限元动力分析方法,得到了横向振型,并通过在现场坝顶安装四台同步起振机对大坝进行横向激振试验作了验证。比较本文建议的整体分析方法和传统的各种单坝段分析方法表明,对按<水工建筑物抗震设计规范>要求有足够横向刚度的大头坝,后者难以反映实际的大头坝横向抗震性能。更多还原

【Abstract】 The lateral earthquake behavior of the buttress dam has been considered as an important but rather difficult problem. So far the lateral dynamic analysis of the dam has been limited to performing analysis on a single or several dam blocks.This paper suggests a method of dynamic analysis of the problem by finite element method considering all the dam blocks as a whole system. A typical lateral mode shape of the whole dam has been revealed and verified by a field dynamic experiment, using four synchronized rotating mass shakers exciting at the dam crest in the axial direction of the dam.Comparison of the results between the suggested method and the various conventional dam block methods shows that the latter methods are difficult to reflect the actual lateral earthquake behavior of the buttress dam.更多还原