考虑混凝土强度随机不均匀分布的重力坝动力损伤研究  

Research on dynamic damage of gravity dam considering concrete strength inhomogeneity

作　　者：马天骁 张燎军[2] 沈德建[3] 王伟强 MA Tianxiao;ZHANG Liaojun;SHEN Dejian;WANG Weiqiang(College of Water Conservancy,Shenyang Agricultural University,Shenyang 110866,China;College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210098,China;College of Civil and Transportation Engineering,Hohai University,Nanjing 210098,China)

机构地区：[1]沈阳农业大学水利学院,辽宁沈阳110866 [2]河海大学水利水电学院,江苏南京210098 [3]河海大学土木与交通学院,江苏南京210098

出　　处：《地震工程与工程振动》2024年第1期128-136,共9页Earthquake Engineering and Engineering Dynamics

基　　金：江苏省自然科学基金项目(BK20220986);中央高校基本科研业务费项目(B220201029)。

摘　　要：重力坝所采用的大体积混凝土受到其固有特性、浇筑时的施工质量等影响容易导致强度的不均匀性。在目前的混凝土坝抗震分析中,一般将混凝土看成是一种强度分布均匀的材料,对于强度的不均匀性对大坝动力损伤的影响研究不多。基于混凝土塑性损伤理论及Weibull概率分布模型,采用Python语言对ABAQUS进行二次开发。在考虑混凝土塑性损伤的前提下,研究了混凝土强度随机不均匀分布对重力坝坝体和基岩损伤的影响。在计算中综合考虑了坝体和基岩的动力损伤、大坝与库水相互作用、无限地基辐射阻尼等,对比分析了坝体和基岩整体在各个不均匀度下震后损伤区域分布、坝体损伤面积比和损伤耗散能等动力响应,揭示了混凝土强度不均匀程度对大坝及基岩地震损伤的影响规律,研究结果可为重力坝相关的设计和施工提供参考。The mass concrete used in gravity dam is easy to lead to inhomogeneity of strength due to its inherent characteristics,construction quality and other reasons.In the current seismic analysis of concrete dams,concrete is generally regarded as a material with uniform strength distribution,but there are few studies on the influence of strength inhomogeneity on dam dynamic damage.Based on the plastic damage theory of concrete and the probability distribution model of Weibull,Python language is used to redevelop ABAQUS.On the premise of considering the plastic damage of concrete,the influence of random inhomogeneity distribution of concrete strength on the damage of gravity dam body and bedrock is studied.The dynamic damage of dam and bedrock,the interaction between dam and reservoir water,and the radiation damping of infinite foundation are comprehensively considered in calculation.The dynamic responses of dam and bedrock after earthquakes,such as damage area distribution,damage area ratio and damage dissipation energy,are compared and analyzed.The influences of inhomogeneity concrete strength on dam and bedrock seismic damage are revealed.The research results can provide reference for the design and construction of gravity dam.

关 键 词：重力坝 WEIBULL分布 材料不均匀 动力损伤 

分 类 号：TV312[水利工程—水工结构工程]