FRP片材表面加固混凝土重力坝坝踵抗震性能数值模拟
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摘要
基于Pushover方法,采用反映混凝土细观非均匀性的混凝土损伤计算模型,以某一即将兴建的混凝土重力坝为例,研究了下游向地震惯性作用下FRP片材表面加固大坝坝踵后坝踵处的起裂、裂缝扩展、FRP应力状态及剥离现象等。结果表明:FRP片材表面加固混凝土重力坝坝踵能有效地延缓坝踵的起裂及裂缝扩展,减小坝踵可能破坏范围;坝踵FRP片材上应力最高,但远小于FRP的抗拉强度,足见FRP片材加固的有效性。
Based on Pushover method,the phenomena such as crack initiation,cracking development,stress state and debonding of FRP(Fiber Reinforced Plastics) occurred at the dam heel surface-strengthened with FRP sheet under the effect of the downstream-ward seismic inertia are studied herein with a concrete damage model for reflecting the meso-scale heterogeneity of concrete by taking a concrete gravity dam that is to be built as the studying case.The study shows that the crack initiation and cracking development can be effectively alleviated if the heel of concrete gravity dam is surface-strengthened by FRP sheet,and then the possible damaged area of the heel can be largely decreased;i.e.though the stress on the FRP sheet of the heel is highest,it is far lower than the tensile strength of the FRP;which is demonstrated that the FRP sheet has an enough effectivity for strengthening of the dam heel.
Based on Pushover method,the phenomena such as crack initiation,cracking development,stress state and debonding of FRP(Fiber Reinforced Plastics) occurred at the dam heel surface-strengthened with FRP sheet under the effect of the downstream-ward seismic inertia are studied herein with a concrete damage model for reflecting the meso-scale heterogeneity of concrete by taking a concrete gravity dam that is to be built as the studying case.The study shows that the crack initiation and cracking development can be effectively alleviated if the heel of concrete gravity dam is surface-strengthened by FRP sheet,and then the possible damaged area of the heel can be largely decreased;i.e.though the stress on the FRP sheet of the heel is highest,it is far lower than the tensile strength of the FRP;which is demonstrated that the FRP sheet has an enough effectivity for strengthening of the dam heel.
引文
[1]Lin G,Chi S C,Hu Z Q.Structural Control of a High Arch Dam[C]∥Proc.12th World Conferenceon EarthquakeEngineering,NewZealand,2000.
[2]C E Bakis,L C Bank,F ASCE,et al.Fiber-reinforced polymercomposites for construction-state-of-the-art review[J].Journal ofComposites for Construction,2002,6(2):73-87.
[3]Chen J F,Teng J G.Anchorage strength models for FRP and steelplates bonded to concrete[J].Journal of Structural Engineering,2001(7):784-791.
[4]朱万成,唐春安,杨天鸿,等.岩石破裂过程分析(RFPA2D)系统的细观单元本构关系及验证[J].岩石力学与工程学报,2003,22(1):24-29.
[5]钟红,林皋,李建波,等.高拱坝地震损伤破坏的数值模拟[J].水利学报,2008,39(7):848-853.
[6]张娟霞,唐春安,朱万成,等.FRP加固混凝土构件中裂纹扩展规律的数值模拟[J].工程力学,2006,23(12):143-148.
[7]秦泗凤.桥梁抗震性能评价的静力非线性分析方法研究[D].大连:大连理工大学,2008.
[8]SDJ10—78,水工建筑物抗震设计规范[S].
[2]C E Bakis,L C Bank,F ASCE,et al.Fiber-reinforced polymercomposites for construction-state-of-the-art review[J].Journal ofComposites for Construction,2002,6(2):73-87.
[3]Chen J F,Teng J G.Anchorage strength models for FRP and steelplates bonded to concrete[J].Journal of Structural Engineering,2001(7):784-791.
[4]朱万成,唐春安,杨天鸿,等.岩石破裂过程分析(RFPA2D)系统的细观单元本构关系及验证[J].岩石力学与工程学报,2003,22(1):24-29.
[5]钟红,林皋,李建波,等.高拱坝地震损伤破坏的数值模拟[J].水利学报,2008,39(7):848-853.
[6]张娟霞,唐春安,朱万成,等.FRP加固混凝土构件中裂纹扩展规律的数值模拟[J].工程力学,2006,23(12):143-148.
[7]秦泗凤.桥梁抗震性能评价的静力非线性分析方法研究[D].大连:大连理工大学,2008.
[8]SDJ10—78,水工建筑物抗震设计规范[S].
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