超强地震作用下高拱坝损伤开裂行为研究
|
摘要
本文综合应用塑性-损伤耦合模型和接触边界方法,模拟拱坝坝体开裂与横缝开合行为,然后基于有限元仿真方法,分析某高拱坝的强震开裂行为。通过不同温度荷载工况的比较分析,研究温度荷载对拱坝非线性动力响应的影响。计算结果显示:在强震作用下,拱坝下游坝面损伤开裂出现在坝体中上部,而上游坝面损伤集中于坝基交界面附近,同时裂缝张开位移幅值较大,扩展深度较深,严重威胁拱坝整体安全。计算结果还表明:施加不同的温度荷载,拱坝的静力变形不同,导致强震作用下拱坝的横缝张开位移、坝体开裂区域、裂缝张开位移等动力响应存在显著差异。
A numerical study is presented for cracking behaviors of high arch dam under strong earthquakes,using a plastic-damage model and a contact boundary method to model concrete cracking and opening/closing behaviors of contraction joint,respectively,and focusing on the influence of thermal loading on dynamic responses of the dam.Computations of the responses show that on the downstream face,concrete cracking occurs in the upper middle region of dam body,while on the upstream face,it concentrates near the dam-foundation interface.These cracks are large in magnitude and extend to the deep interior of the body,hence causing a potential threatening to instability of dam structure.The results indicate a significant influence of thermal loading on the dynamic responses of joint opening,cracks and crack opening displacement,etc.
A numerical study is presented for cracking behaviors of high arch dam under strong earthquakes,using a plastic-damage model and a contact boundary method to model concrete cracking and opening/closing behaviors of contraction joint,respectively,and focusing on the influence of thermal loading on dynamic responses of the dam.Computations of the responses show that on the downstream face,concrete cracking occurs in the upper middle region of dam body,while on the upstream face,it concentrates near the dam-foundation interface.These cracks are large in magnitude and extend to the deep interior of the body,hence causing a potential threatening to instability of dam structure.The results indicate a significant influence of thermal loading on the dynamic responses of joint opening,cracks and crack opening displacement,etc.
引文
[1]Valliappan S,Yazdchi M,Khalili N.Seismic analysis of arch dams——a continuum damage mechanics approach[J].InternationalJournal for Numerical Methods in Engineering,1999,45:1695-1724.
[2]Karaton M,Calayir Y,Bayraktar A.Seismic analysis of arch dams including dam-reservoir interaction via a continuum damagemodel[J].Structural Engineering and Mechanics,2006,22:351-370.
[3]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 on the failure mode of arch dams subjected to earthquakes by model test andnumerical simulation[J].Journal of Hydraulic Engineering,2010,29(4):148-153.(in Chinese)
[4]Lotfi V,Espandar R.Seismic analysis of concrete arch dams by combined discrete crack and non-orthogonal smeared cracktechnique[J].Engineering Structures,2004,26:27-37.
[5]Bazant Z P,Oh B H.Crack band theory for fracture of concrete[J].Materiaux et Constructions(Materials and Structures).1983,16:155-177.
[6]Pan J,Zhang C,Wang J,et al.Seismic damage-cracking analysis of arch dams using different earthquake input mechanisms[J].Science in China,Series E:Technological Sciences,2009,52:518-529.(下转至第190页)
[7]Lee J,Fenves G L.Plastic-damage model for cyclic loading of concrete structures[J].Journal of Engineering Mechanics,ASCE.1998,124:892-900.
[8]Lee J,Fenves G L.A return-mapping algorithm for plastic-damage models:3-D and plane stress formulation[J].Internationa Journal for Numerical Methods in Engineering,2001,50:487-506.
[9]龙渝川.钢筋混凝土数值模拟与高坝抗震配筋分析研究[D],博士学位论文.北京:清华大学;2007.LONG Yuchuan.Numerical simulation of reinforced concrete and analysis of reinforcement for high dams to resist earthquakes[D],doctoral thesis.Beijing:Tsinghua University,2007.(in Chinese)
[10]龙渝川,周元徳,张楚汉.基于两类横缝接触模型的拱坝非线性动力响应研究[J].水利学报.2005,36(9):1094-1099.LONG Yuchuan,ZHOU Yuande,ZHANG Chuhan.A comparison study of nonlinear dynamic responses of arch dams based on two types of contraction joint models[J].Journal of Hydraulic Engineering,2005,36(9):1094-1099.(in Chinese)
[11]Chaudhary A B,Bathe K-J.A solution method for static and dynamic analysis of three-dimensional contact problems with friction.Computers&Structures,1986,24:855-873.
[12]龙渝川,张楚汉,周元徳.基于弥散与分离裂缝模型的混凝土开裂比较研究[J].工程力学,2008,25(3):80-84.LONG Yuchuan,ZHANG Chuhan,ZHOU Yuande.A comparative study for concrete fracture analysis using smeared-and discretecrack model[J].Engineering Mechanics,2008,25(3):80-84.(in Chinese)
[2]Karaton M,Calayir Y,Bayraktar A.Seismic analysis of arch dams including dam-reservoir interaction via a continuum damagemodel[J].Structural Engineering and Mechanics,2006,22:351-370.
[3]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 on the failure mode of arch dams subjected to earthquakes by model test andnumerical simulation[J].Journal of Hydraulic Engineering,2010,29(4):148-153.(in Chinese)
[4]Lotfi V,Espandar R.Seismic analysis of concrete arch dams by combined discrete crack and non-orthogonal smeared cracktechnique[J].Engineering Structures,2004,26:27-37.
[5]Bazant Z P,Oh B H.Crack band theory for fracture of concrete[J].Materiaux et Constructions(Materials and Structures).1983,16:155-177.
[6]Pan J,Zhang C,Wang J,et al.Seismic damage-cracking analysis of arch dams using different earthquake input mechanisms[J].Science in China,Series E:Technological Sciences,2009,52:518-529.(下转至第190页)
[7]Lee J,Fenves G L.Plastic-damage model for cyclic loading of concrete structures[J].Journal of Engineering Mechanics,ASCE.1998,124:892-900.
[8]Lee J,Fenves G L.A return-mapping algorithm for plastic-damage models:3-D and plane stress formulation[J].Internationa Journal for Numerical Methods in Engineering,2001,50:487-506.
[9]龙渝川.钢筋混凝土数值模拟与高坝抗震配筋分析研究[D],博士学位论文.北京:清华大学;2007.LONG Yuchuan.Numerical simulation of reinforced concrete and analysis of reinforcement for high dams to resist earthquakes[D],doctoral thesis.Beijing:Tsinghua University,2007.(in Chinese)
[10]龙渝川,周元徳,张楚汉.基于两类横缝接触模型的拱坝非线性动力响应研究[J].水利学报.2005,36(9):1094-1099.LONG Yuchuan,ZHOU Yuande,ZHANG Chuhan.A comparison study of nonlinear dynamic responses of arch dams based on two types of contraction joint models[J].Journal of Hydraulic Engineering,2005,36(9):1094-1099.(in Chinese)
[11]Chaudhary A B,Bathe K-J.A solution method for static and dynamic analysis of three-dimensional contact problems with friction.Computers&Structures,1986,24:855-873.
[12]龙渝川,张楚汉,周元徳.基于弥散与分离裂缝模型的混凝土开裂比较研究[J].工程力学,2008,25(3):80-84.LONG Yuchuan,ZHANG Chuhan,ZHOU Yuande.A comparative study for concrete fracture analysis using smeared-and discretecrack model[J].Engineering Mechanics,2008,25(3):80-84.(in Chinese)
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心