地震作用下丰满重力坝的塑性损伤
|
摘要
基于混凝土塑性损伤本构模型,将可以表征材料和结构渐进破坏的损伤变量作为内变量,考虑了混凝土拉压异性的损伤变量,利用有限元软件ABAQUS,对丰满混凝土重力坝在经受地震作用下的结构损伤区域的发展变化进行安全性评价。在数值计算过程中,对于受地震荷载作用所引起的地面水平运动而导致大坝水位水平运动对坝体的影响,通过扩充后的广义Westergaard公式予以计算模拟。通过分析得到了丰满大坝在地震作用下的塑性损伤破坏情况,并评价了丰满大坝的安全性,亦说明利用损伤力学对大坝进行安全性评价是一个可行的方法。
The safe evaluation of the development of the damage areas of the Fengman Concrete Gravity Dam subjected to the earthquake is based on the plastic-damage model for concrete by the soft of ABAQUS. The damage variable which is the label of the damage of the material or the structure is considered as a internal variable. In this process of calculation the two variables,one for tensile damage and the other for compressive damage,is considered. The dam-reservoir dynamic interaction resulting from the transverse component of ground motion is modeled by using the developed and generalized Westergaard formula added mass technique. The hydrodynamic pressures resulting from the vertical component of ground motion are assumed to be small and are neglected in simulation. The safety and the overload potential of the Fengman concrete gravity is known by simulation. At the same time,it is concluded that the damage can be used to evaluate the safety of the dams subjected to the earthquake.
The safe evaluation of the development of the damage areas of the Fengman Concrete Gravity Dam subjected to the earthquake is based on the plastic-damage model for concrete by the soft of ABAQUS. The damage variable which is the label of the damage of the material or the structure is considered as a internal variable. In this process of calculation the two variables,one for tensile damage and the other for compressive damage,is considered. The dam-reservoir dynamic interaction resulting from the transverse component of ground motion is modeled by using the developed and generalized Westergaard formula added mass technique. The hydrodynamic pressures resulting from the vertical component of ground motion are assumed to be small and are neglected in simulation. The safety and the overload potential of the Fengman concrete gravity is known by simulation. At the same time,it is concluded that the damage can be used to evaluate the safety of the dams subjected to the earthquake.
引文
[1]徐道远,王向东,朱为玄,等.混凝土坝的损伤及损伤仿真计算[J].河海大学学报(自然科学版),2002,30(4):14―17.XU Dao-yuan,WANG Xiang-dong,ZHU Wei-xuan,et al.Damage to concrete dams and its simulation calculation[J].Journal of Hohai University(Natural Sciences),2002,30(4):14―17.
[2]Lubliner J,Oliver J,Oller S,et al.A Plastic-damage Model for Concrete[J].Solids Structures,1989,25(3):299―326.
[3]Jeeho Lee,Gregory L Fenves.Plastic-damage Model for Cyclic Loading of Concrete Structures[J].Journal of Engineering Mechanics,1998,124(8):892―900.
[4]Jeeho Lee,Gregory L Fenves.A plastic-damage concrete model for earthquake analysis of dams[J].Earthquake Engineering and Structural Dynamics,1998,27(9):937―956.
[5]邵长江,钱永久.Koyna混凝土重力坝的塑性地震损伤响应分析[J].振动与分析,2006,25(4):129―131.SHAO Chang-jiang,QIAN Yong-jiu.Seismic plastic damage response analysis of koyna concrete gravity dam[J].Journal of Vibrate and Shock,2006,25(4):129―131.
[6]林皋,陈建云,肖诗云.混凝土的动力特性与拱坝的非线性地震响应[J].水利学报.2003,(6):30―36.LIN Gao,XIAO Shi-yun,CHEN Jian-yun.Dynamic behavior of concrete and nonlinear seismic response of arch dam[J].Journal of Hydraulic Engineering,2003,(6):30―36.
[7]杜荣强,林皋.混凝土动力损伤本构关系的基础理论及应用[J].哈尔滨工业大学学报,2006,38(5):746―751.DU Rong-qiang,LIN Gao.Fundamental summarizing and previewing for concrete dynamic damage constitutive model[J].Journal of Harbin Institute of Technology,2006,38(5):746―751.
[8]Westergaard H W.Water pressures on dams during earthquakes[J].Transactions,ASCE,1933,98:418―472.
[9]李瓒,陈兴华,郑建波,等.混凝土拱坝设计[M].北京:中国电力出版社,2000.
[10]徐汉忠,吴旭光,马贞信.计算动水压力附加质量的韦氏公式的扩充[J].河海大学学报.1997,25(5):120―122.
[2]Lubliner J,Oliver J,Oller S,et al.A Plastic-damage Model for Concrete[J].Solids Structures,1989,25(3):299―326.
[3]Jeeho Lee,Gregory L Fenves.Plastic-damage Model for Cyclic Loading of Concrete Structures[J].Journal of Engineering Mechanics,1998,124(8):892―900.
[4]Jeeho Lee,Gregory L Fenves.A plastic-damage concrete model for earthquake analysis of dams[J].Earthquake Engineering and Structural Dynamics,1998,27(9):937―956.
[5]邵长江,钱永久.Koyna混凝土重力坝的塑性地震损伤响应分析[J].振动与分析,2006,25(4):129―131.SHAO Chang-jiang,QIAN Yong-jiu.Seismic plastic damage response analysis of koyna concrete gravity dam[J].Journal of Vibrate and Shock,2006,25(4):129―131.
[6]林皋,陈建云,肖诗云.混凝土的动力特性与拱坝的非线性地震响应[J].水利学报.2003,(6):30―36.LIN Gao,XIAO Shi-yun,CHEN Jian-yun.Dynamic behavior of concrete and nonlinear seismic response of arch dam[J].Journal of Hydraulic Engineering,2003,(6):30―36.
[7]杜荣强,林皋.混凝土动力损伤本构关系的基础理论及应用[J].哈尔滨工业大学学报,2006,38(5):746―751.DU Rong-qiang,LIN Gao.Fundamental summarizing and previewing for concrete dynamic damage constitutive model[J].Journal of Harbin Institute of Technology,2006,38(5):746―751.
[8]Westergaard H W.Water pressures on dams during earthquakes[J].Transactions,ASCE,1933,98:418―472.
[9]李瓒,陈兴华,郑建波,等.混凝土拱坝设计[M].北京:中国电力出版社,2000.
[10]徐汉忠,吴旭光,马贞信.计算动水压力附加质量的韦氏公式的扩充[J].河海大学学报.1997,25(5):120―122.
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