重力坝地震损伤分析中弹性损伤与考虑残余变形的损伤模型比较
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摘要
弹性损伤与考虑残余变形的损伤模型是目前混凝土坝损伤分析中常用的两种模型。本文将两种损伤模型应用在Koyna重力坝破坏分析中,比较了两者模拟的开裂范围和裂缝张开度。计算结果表明:弹性损伤模型计算所得坝体的开裂范围和裂缝张开度均小于考虑残余变形损伤模型计算所得结果。弹性损伤模型计算所得结果偏于不安全。
Elastic damage model and damage model considering residue deformation are two commonly used models for seismic damage analysis of gravity dams.They were used to calculate crack range and opening width in the seismic analysis of the Koyna dam and their computations are compared.The results show that the crack range and maximum opening width computed with the elastic damage model are smaller than those with the damage model considering residue deformation.Thus,the simulation results with the elastic damage model are unsafe.
Elastic damage model and damage model considering residue deformation are two commonly used models for seismic damage analysis of gravity dams.They were used to calculate crack range and opening width in the seismic analysis of the Koyna dam and their computations are compared.The results show that the crack range and maximum opening width computed with the elastic damage model are smaller than those with the damage model considering residue deformation.Thus,the simulation results with the elastic damage model are unsafe.
引文
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[3]梁正召,唐春安,张永彬,等.岩石三维破裂过程的数值模拟研究[J].岩石力学与工程学报,2006,25(5):931-936.LIANG Zhengzhao,TANG Chun-an,ZHANG Yongbin,et al.3D numerical simulation of failure process of rock[J].Chinese Journal of Rock Mechanics and Engineering,2006,25(5):931-936.(in Chinese)
[4]杜荣强,林皋,胡志强.混凝土重力坝动力弹塑性损伤安全评价[J].水利学报,2006,37(9):1056-1062.DU Rongqiang,LIN Gao,HU Zhiqiang.Safety assessment of concrete gravity dams based on dynamic elastoplastic-damage analysis[J].Journal of Hydraulic Engineering,2006,37(9):1056-1062.(in Chinese)
[5]钟红,林皋,李红军,等.拱坝地震破坏的模型试验与数值模拟[J].水力发电学报,2010,29(4):148-153.ZHONG Hong,LIN Gao,LI Hongjun,et al.Study of the failure mode of arch dams subjected to earthquakes by model test and numerical simulation[J].Journal of Hydroelectric Engineering,2010,29(4):148-153.(in Chinese)
[6]潘坚文,王进廷,张楚汉.超强地震作用下拱坝的损伤开裂分析[J].水利学报,2007,38(2):143-149.PAN Jianwen,WANG Jinting,ZHANG Chuhan.Analysis of damage and cracking in arch dam subjected to extremely strong earthquake[J].Journal of Hydraulic Engineering,2007,38(2):143-149.(in Chinese)
[7]Lee J,Fenves L G.A Plastic-Damage Concrete Model for Earthquake Analysis of Dams[J].Journal of Earthquake Engineering And Structural Dynamics,1998,27:937-956.
[8]陈厚群,郭胜山.地震作用下混凝土高坝损伤模型的探讨[C]∥第四届全国结构振动与动力学学术研讨会议.苏州,2011:14-16.CHEN Houqun,GUO Shengshan.Discuss on Damage Model of High Concrete Dam under Seismic Loading[C]∥The Fourth National Symposium Conference of Structural Vibration and Dynamics.Suzhou,2011:14-16.(in Chinese)
[9]陈厚群,郭胜山.混凝土高坝-地基体系的地震损伤分析[J],水利学报,2012,43(增刊1):1-7.CHEN Houqun,GUO Shengshan.Seismic damage analysis of high concrete dam-foundation system[J].Journal of Hydraulic Engineering,2012,43(S1):1-7.(in Chinese)
[10]Lee J,Fenves L G.Plastic-Damage Model for Cyclic Loading of Concrete Structures[J].Journal of Engineering Mechanics,1998,124(3):892-900.
[11]郭胜山,陈厚群,李德玉,等.混凝土动力塑性损伤分析中的单元尺寸效应探讨[J].水力发电学报,2011,30(6):52-56.GUO Shengshan,CHEN Houqun,LI Deyu,et al.Study of element-size effect on dynamic plastic-damage analysis of concrete[J].Journal of Hydroelectric Engineering,2011,30(6):52-56.(in Chinese)
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