高混凝土重力坝整体抗震性能研究
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摘要
建立了考虑实际地形、地质条件影响的整体重力坝有限元模型,分别以规范反应谱、场地反应谱为目标谱合成了设计地震、校核地震下共4条人工地震波,然后对该整体重力坝模型在4种工况下进行了时程动力分析,并对坝体关键部位的主应力按极限状态公式进行了强度验算,结果表明:在该设计、校核地震作用下,高混凝土重力坝整体抗震性能比单个坝段要强,坝踵垫层混凝土和上、下游折坡处材料抗拉强度均满足要求;坝趾的抗压强度也满足要求,并且具有较大的安全裕度;场地谱人工波的计算结果与规范谱人工波的结果很接近.
A 3D finite element model of an integral gravity dam considering the influence of actual topographical and geological conditions is built.Then four simulated earthquake waves are synthesized under the design earthquake and check earthquake conditions based on the specification spectra and the site spectra,respectively.The time-history analysis of the integral gravity dam under four calculation conditions are carried out.The principal stresses in main parts of the dam are checked by the limit state equation.It is concluded that the aseismic performance of integral high concrete gravity dam is better than the single monolith;and the concrete's tensile intensity of the integral gravity dam under the dynamic action meets the standard requirements.The compressive strength of the dam toe also meets the standard requirements,and has greater allowance.The results under different earthquake waves of the site spectra and the specification spectra are very close.
A 3D finite element model of an integral gravity dam considering the influence of actual topographical and geological conditions is built.Then four simulated earthquake waves are synthesized under the design earthquake and check earthquake conditions based on the specification spectra and the site spectra,respectively.The time-history analysis of the integral gravity dam under four calculation conditions are carried out.The principal stresses in main parts of the dam are checked by the limit state equation.It is concluded that the aseismic performance of integral high concrete gravity dam is better than the single monolith;and the concrete's tensile intensity of the integral gravity dam under the dynamic action meets the standard requirements.The compressive strength of the dam toe also meets the standard requirements,and has greater allowance.The results under different earthquake waves of the site spectra and the specification spectra are very close.
引文
[1]陈雯,李昕,周晶.混凝土重力坝整体动力特性研究[J].世界地震工程,2006,22(4):63-69.
[2]焦爱萍,刘宪亮,许新勇.宝泉浆砌石重力坝三维有限元动力分析[J].水利水运工程学报,2007(1):36-40.
[3]李德玉,叶建群,涂劲等.碾压混凝土重力坝整体三维非线性有限元地震反应分析[J].水力发电学报,2009,28(5):78-82.
[4]任青文,杜成斌.光照水电站工程大坝抗震安全复核技术开发研究[R].南京:河海大学,2009.
[5]DL 5073-2000.水工建筑物抗震设计规范[S].
[6]Chen Houqun.Design Seismic Input for Large Dams[C].74th Annual Meeting of ICOLD,Barcelona:Spain,June,2006.
[7]DL 5108-1999.混凝土重力坝设计规范[S].
[2]焦爱萍,刘宪亮,许新勇.宝泉浆砌石重力坝三维有限元动力分析[J].水利水运工程学报,2007(1):36-40.
[3]李德玉,叶建群,涂劲等.碾压混凝土重力坝整体三维非线性有限元地震反应分析[J].水力发电学报,2009,28(5):78-82.
[4]任青文,杜成斌.光照水电站工程大坝抗震安全复核技术开发研究[R].南京:河海大学,2009.
[5]DL 5073-2000.水工建筑物抗震设计规范[S].
[6]Chen Houqun.Design Seismic Input for Large Dams[C].74th Annual Meeting of ICOLD,Barcelona:Spain,June,2006.
[7]DL 5108-1999.混凝土重力坝设计规范[S].
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