动态弹性模量变化对拱坝动力反应的影响
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摘要
现行水工抗震设计规范规定,大坝混凝土动态弹性模量在静态弹性模量基础上提高30%,对岩体动态变形模量的取值并无规定,现行工程实践中岩体动态变形模量通常在静态变形模量基础上提高30%。根据国内外最新研究成果修编中的新规范拟规定:大坝混凝土动态弹性模量在静态弹性模量基础上提高50%,岩体动态变形模量取为静态变形模量。本文针对新规范的这一变化,结合不同高度的拱坝,从大坝自振特性、动位移、动应力及静动综合应力诸方面进行比较分析,论证混凝土两种动弹性模量以及基岩两种动变形模量取值的影响。结果表明,坝体动弹模从30%提高到50%以及基岩动变模是否提高30%对坝体动力特性和地震反应影响不大。
According to Specifications of seismic design of hydraulic structures,the dynamic concrete modu lus of elasticity of concrete dams should be raised 30 percent compared with that of statics.The seismic de sign of hydraulic structures has no specification of dynamic rock modulus of deformation,and the dynamic deformation modulus is often raised 30 percent compared with that of statics in the current engineering prac tice.According to the new Specifications of seismic design of hydraulic structures that is under revision,the dynamic concrete modulus of elasticity of concrete dam should be raised 50 percent compared with that of statics,and the dynamic deformation modulus can be taken as static value.In response to this change,the dynamic analysis of various-height arch dams were carried out to evaluate the influence on the dynam ic properties and seismic response due to above two kinds of dynamic concrete modulus of elasticity and dy namic rock modulus of deformation in this paper.The result shows that two kinds of modulus of concrete and rock have no significant influence on the dynamic properties and seismic response of arch dams.
According to Specifications of seismic design of hydraulic structures,the dynamic concrete modu lus of elasticity of concrete dams should be raised 30 percent compared with that of statics.The seismic de sign of hydraulic structures has no specification of dynamic rock modulus of deformation,and the dynamic deformation modulus is often raised 30 percent compared with that of statics in the current engineering prac tice.According to the new Specifications of seismic design of hydraulic structures that is under revision,the dynamic concrete modulus of elasticity of concrete dam should be raised 50 percent compared with that of statics,and the dynamic deformation modulus can be taken as static value.In response to this change,the dynamic analysis of various-height arch dams were carried out to evaluate the influence on the dynam ic properties and seismic response due to above two kinds of dynamic concrete modulus of elasticity and dy namic rock modulus of deformation in this paper.The result shows that two kinds of modulus of concrete and rock have no significant influence on the dynamic properties and seismic response of arch dams.
引文
[1]陈厚群,等.大岗山拱坝全级配混凝土地震动态抗力研究报告[R].北京:中国水利水电科学研究院,2010.
[2]DL5073-2000,水工建筑物抗震设计规范[S].
[3]DL/T5146-2006,混凝土拱坝设计规范[S].
[4]FEMA.Federal Guidelines for Dam Safety:Earthquake Analyses and Design of Dams[S].2005.
[5]李德玉,陈厚群.混凝土动态弹性模量对重力坝地震反应的影响分析[J].中国水利水电科学研究院学报,2012,10(2):81-85.
[6]李德玉,陈厚群.拱坝试载法静动力分析程序SDTLM88[R].北京:水利水电科学研究院,1988.
[2]DL5073-2000,水工建筑物抗震设计规范[S].
[3]DL/T5146-2006,混凝土拱坝设计规范[S].
[4]FEMA.Federal Guidelines for Dam Safety:Earthquake Analyses and Design of Dams[S].2005.
[5]李德玉,陈厚群.混凝土动态弹性模量对重力坝地震反应的影响分析[J].中国水利水电科学研究院学报,2012,10(2):81-85.
[6]李德玉,陈厚群.拱坝试载法静动力分析程序SDTLM88[R].北京:水利水电科学研究院,1988.
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