基于耐震时程法的特高拱坝极限抗震能力研究

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摘要在对300m级特高拱坝进行抗震安全评价时，常常面临着工程条件复杂、有限元模型自由度数目多、计算耗时较长、效率较低等问题。为了提高分析效率，节约计算成本，采用了耐震时程法来分析特高拱坝及坝基的动力损伤行为，并进行极限抗震能力研究。基于耐震时程法理论，以《水工建筑物抗震设计规范》中的标准反应谱为目标谱，采用非线性最小二乘法生成精度较高的3条耐震时程曲线。以我国西南地区某300m级特高拱坝为例，建立了坝体—基岩三维非线性有限元分析模型，并同时考虑地震动的输入、坝体及基岩的损伤开裂、横缝的动态开合等关键问题。通过考察拱冠梁最大相对位移、横缝最大开度、坝体损伤体积比、损伤耗能等指标来综合评价大坝的极限抗震能力。结果表明，耐震时程法能够很好的反映出特高拱坝在不同强度地震动作用下的动力响应，且计算效率较高。

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	马天骁
	张燎军
	张汉云
	史俊飞
	翟亚飞

关键词 ：特高拱坝, 耐震时程法, 混凝土损伤, 极限抗震能力

Abstract：When evaluating the seismic performance of a 300m-level ultra-high arch dam, it is often faced with problems such as complex structure models, large number of freedom degrees, and long calculation time. In order to improve the analysis efficiency and save the calculation cost, the seismic time history method is used to analyze the dynamic damage behavior of dam and foundation, and the ultimate seismic capacity is studied. Based on the theory of endurance time method, taking the standard response spectrum in the “Code for Seismic Design of hydraulic structures” as the target spectrum, three seismic time history curves with high precision are generated by nonlinear least square method. Taking a 300m ultra-high arch dam in southwest China as an example, a three-dimensional nonlinear finite element analysis model of dam body and bedrock is established. Several key problems such as the input of ground motion, the damage cracking of dam body and bedrock, the dynamic opening of contraction joints are considered. The ultimate seismic capacity of the dam is comprehensively evaluated by analyzing the maximum relative displacement of crown cantilever, the maximum opening of transverse joint, the damage volume ratio of dam and the damage dissipation energy. The results show that the endurance time method can well reflect the dynamic response of ultra-high arch dam under different intensity ground motion and has high calculation efficiency.

Key words： ultra-high arch dam endurance time method concrete damage ultimate seismic capacity

收稿日期: 2021-02-24 出版日期: 2022-06-15

引用本文:

马天骁，张燎军，张汉云，史俊飞，翟亚飞. 基于耐震时程法的特高拱坝极限抗震能力研究[J]. 振动与冲击, 2022, 41(11): 217-224.
MA Tianxiao, ZHANG Liaojun, ZHANG Hanyun, SHI Junfei, ZHAI Yafei. Ultimate aseismic capacity of ultra-high arch dam based on endurance time method. JOURNAL OF VIBRATION AND SHOCK, 2022, 41(11): 217-224.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2022/V41/I11/217

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