混凝土重力坝动力弹塑性损伤安全评价
|
摘要
本文利用能考虑混凝土软化并可反映实际损伤耗散的模型,对结构进行动力损伤分析,用损伤量这一表明材料或结构渐进破坏的指标,并结合结构应力重分布,对大坝进行地震安全评价。对Koyna坝动力弹塑性损伤分析结果表明,大坝的最大拉应力、最大压应力和损伤分布与Koyna大坝实际破坏情况大致相符,验证了计算模型的有效性。将其应用于三峡大坝的一个非溢流断面,得到地震作用下的弹塑性损伤响应,并据此评价大坝结构的安全性能和超载潜能。研究表明,利用损伤力学进行混凝土重力坝安全评价将取得较合理的结果,损伤是除应力之外对结构安全评判的可信指标。
A damage mechanics model associated with strain softness after post-peak for concrete is proposed,which can reflect reasonable damage dissipation of concrete fracture.Combined with redistribution of stress,the damage index is used to perform safety assessment of gravity dams in dynamic elastoplastic-damage analysis.The validity of the model is verified by the observation data of the Koyna Dam.The model is applied to analyze a section of the gravity dam in the Three Gorges Project.The elastoplastic-damage response of the dam is obtained and the safety and overload potential of the dam are assessed accordingly.It is concluded that damage is a credible nonlinear index which can be used to assess the safety of dams subjected to earthquake.
A damage mechanics model associated with strain softness after post-peak for concrete is proposed,which can reflect reasonable damage dissipation of concrete fracture.Combined with redistribution of stress,the damage index is used to perform safety assessment of gravity dams in dynamic elastoplastic-damage analysis.The validity of the model is verified by the observation data of the Koyna Dam.The model is applied to analyze a section of the gravity dam in the Three Gorges Project.The elastoplastic-damage response of the dam is obtained and the safety and overload potential of the dam are assessed accordingly.It is concluded that damage is a credible nonlinear index which can be used to assess the safety of dams subjected to earthquake.
引文
[1]林皋,陈健云.混凝土大坝的抗震安全评价[J].水利学报,2001,(2):8-15.
[2]Krajcinovic D.Damage mechanics:acomplishments,trends and needs[J].Int.J.Solids Structures,2000,37:267-277.
[3]Skrikerud P E,Bachmann H.Discrete crack modeling for dynamically loaded,unreinforced concrete structures[J].Earthqu.Engng.Struct.Dynam.,1986,14:297-315.
[4]Ayari L M,Saouma V E.A fracture mechanics based seismic analysis of concrete gravity dams using discrete cracks[J].Engng.Fract.Mech.,1990,35:587-598.
[5]Wang G,Pekau O A,Zhang C,et al.Seismic fracture analysis of concrete gravity dams based on nonlinear fracturemechanics[J].Engng.Fract.Mech.,2000,65:67-87.
[6]Bhattacharjee S S,Leger P.Seismic cracking and energy dissipation in concrete gravity dams[J].Earthqu.Engng.Struct.Mech.,1993,22:991-1007.
[7]Calayir Y,Karaton M.Seismic fracture analysis of concrete gravity dams including dam-reservoir interaction[J].Comput.Struct.,2005,83:1595-1606.
[8]Pekau O P,Feng L,Zhang C.Seismic facture of Koyna dam:case study[J].Earthqu.Engng.Struct.Dynam.,1995,24:15-33.
[9]张国新,金峰,王光纶.用基于流形元的子域奇异边界元法模拟重力坝的地震破坏[J].工程力学,2001,18(4):18-27.
[10]Mirzabozorg H,Ghaemian M.Non-linear behavior of mass concrete in three-dimensional problems using a smeared crackapproach[J].Earthqu.Engng.Struct.Dynam.,2005,34:247-269.
[11]Ghrib F,Tinawi R.Nonlinear behavior of concrete dams using damage mechanics[J].J.Engng.Mech.,1995,121:513-527.
[12]邱战洪,张我华,任廷鸿.地震荷载作用下大坝系统的非线性动力损伤分析[J].水利学报,2005,36(5):629-636.
[13]Yazdchi M,Khalili N,Valliappan S.Non-linear seismic behavior of concrete dams using coupled finite element-boundaryelement technique[J].Int.J.Numer.Meth.Engng.,1999,44:101-130.
[14]Meschke G,Lackner R,Mang H A.An anisotropic elastoplastic-damage model for plain concrete[J].Int.J.Numer.Meth.Engng.,1998,42:703-727.
[15]张我华,金荑,陈云敏.损伤材料的动力响应特性[J].振动工程学报,2000,13(3):413-425.
[16]汝乃华.重力坝[M].北京:水利电力出版社,1983.
[17]Cervera M,Oliver J,Manzoli O.A rate-dependent isotropic damage model for the seismic analysis of concrete dams[J].Earthquake Engineering Structural Dynamics,1996,25:987-1010.
[2]Krajcinovic D.Damage mechanics:acomplishments,trends and needs[J].Int.J.Solids Structures,2000,37:267-277.
[3]Skrikerud P E,Bachmann H.Discrete crack modeling for dynamically loaded,unreinforced concrete structures[J].Earthqu.Engng.Struct.Dynam.,1986,14:297-315.
[4]Ayari L M,Saouma V E.A fracture mechanics based seismic analysis of concrete gravity dams using discrete cracks[J].Engng.Fract.Mech.,1990,35:587-598.
[5]Wang G,Pekau O A,Zhang C,et al.Seismic fracture analysis of concrete gravity dams based on nonlinear fracturemechanics[J].Engng.Fract.Mech.,2000,65:67-87.
[6]Bhattacharjee S S,Leger P.Seismic cracking and energy dissipation in concrete gravity dams[J].Earthqu.Engng.Struct.Mech.,1993,22:991-1007.
[7]Calayir Y,Karaton M.Seismic fracture analysis of concrete gravity dams including dam-reservoir interaction[J].Comput.Struct.,2005,83:1595-1606.
[8]Pekau O P,Feng L,Zhang C.Seismic facture of Koyna dam:case study[J].Earthqu.Engng.Struct.Dynam.,1995,24:15-33.
[9]张国新,金峰,王光纶.用基于流形元的子域奇异边界元法模拟重力坝的地震破坏[J].工程力学,2001,18(4):18-27.
[10]Mirzabozorg H,Ghaemian M.Non-linear behavior of mass concrete in three-dimensional problems using a smeared crackapproach[J].Earthqu.Engng.Struct.Dynam.,2005,34:247-269.
[11]Ghrib F,Tinawi R.Nonlinear behavior of concrete dams using damage mechanics[J].J.Engng.Mech.,1995,121:513-527.
[12]邱战洪,张我华,任廷鸿.地震荷载作用下大坝系统的非线性动力损伤分析[J].水利学报,2005,36(5):629-636.
[13]Yazdchi M,Khalili N,Valliappan S.Non-linear seismic behavior of concrete dams using coupled finite element-boundaryelement technique[J].Int.J.Numer.Meth.Engng.,1999,44:101-130.
[14]Meschke G,Lackner R,Mang H A.An anisotropic elastoplastic-damage model for plain concrete[J].Int.J.Numer.Meth.Engng.,1998,42:703-727.
[15]张我华,金荑,陈云敏.损伤材料的动力响应特性[J].振动工程学报,2000,13(3):413-425.
[16]汝乃华.重力坝[M].北京:水利电力出版社,1983.
[17]Cervera M,Oliver J,Manzoli O.A rate-dependent isotropic damage model for the seismic analysis of concrete dams[J].Earthquake Engineering Structural Dynamics,1996,25:987-1010.
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