切割式横缝碾压混凝土重力坝抗震安全性研究
|
摘要
由于切割式横缝的联接作用,切割式横缝碾压混凝土重力坝近似为一个整体结构。当遭遇强震作用时,随着切割式横缝的开裂程度不同,碾压混凝土重力坝的抗震安全性也就有所不同。针对切割式横缝的结构特点,在有限元法动力分析中,利用"生死"单元来模拟切割式横缝的联接单元和切割单元,且以整个横缝联接单元弹性模量的不同折减来模拟切割式横缝的不同开裂程度,并应用到金安桥水电站左岸坡坝段群的抗震安全性分析中。分析结果表明:金安桥水电站左岸坡坝段群在设防烈度为IX度的地震作用下,切割式横缝的开裂对左岸坡单个坝段和坝段群的抗震安全性影响不大,且大坝是安全的。这说明了金安桥水电站碾压混凝土重力坝结构设计合理,能够抵御设防地震。
RCC gravity dam with incised transverse joint is a whole structure approximately due to joint effect of incised transverse joint.When RCC gravity dam encounters strong earthquake,aseismic safety of dam is mutative with different cracked degrees.During aseismic analysis by using FEM,considering structure characteristic of tru-cut transverse joint,joined mesh and incised mesh of incised transverse joint can be simulated by living mesh and killed mesh;and cracked degree can be equaled to discount elasticity moduli of the whole joined mesh of incised transverse joint.In the end,the aseismic safety of left bank dam monoliths of Jinanqiao Hydropower Station using above methods are analyzed.The results indicate while left bank dam monoliths of Jinaoqiao Hydropower Station encounters M9 earthquake,cracking of incised transverse joint has little influence on aseismic safety of individual dam monolith and dam monolith,and dam is safe.This indicates Jinanqiao Hydropower Station RCC gravity dam can withstand the design earthquake with the reasonable design.
RCC gravity dam with incised transverse joint is a whole structure approximately due to joint effect of incised transverse joint.When RCC gravity dam encounters strong earthquake,aseismic safety of dam is mutative with different cracked degrees.During aseismic analysis by using FEM,considering structure characteristic of tru-cut transverse joint,joined mesh and incised mesh of incised transverse joint can be simulated by living mesh and killed mesh;and cracked degree can be equaled to discount elasticity moduli of the whole joined mesh of incised transverse joint.In the end,the aseismic safety of left bank dam monoliths of Jinanqiao Hydropower Station using above methods are analyzed.The results indicate while left bank dam monoliths of Jinaoqiao Hydropower Station encounters M9 earthquake,cracking of incised transverse joint has little influence on aseismic safety of individual dam monolith and dam monolith,and dam is safe.This indicates Jinanqiao Hydropower Station RCC gravity dam can withstand the design earthquake with the reasonable design.
引文
[1]孙恭尧,王三一,冯树荣.高碾压混凝土重力坝[M].北京:中国电力出版社,2004.
[2]张社荣,卢向丽.拱形重力坝地震动力反应分析[J].水力发电学报,2004,23(2):65-68.
[3]何发祥,王忠,刘浩吾.采用无质量地基模型时动力平衡方程的缩减[J].四川大学学报(工程科学版),2000,32(4):7-10.
[4]朱境清.结构抗震分析原理[M].北京:地震出版社,2002.
[5]刘国明.古田溪一级重力坝悬臂梁振型分解反应谱法抗震计算[J].水力发电学报,2004,23(1):31-35.
[6]刘国明.古田溪三级平板支墩坝动抗滑稳定分析[J].水利学报,2000,(1):54-59.
[7]白卫峰,陈健云,钟红.基于混凝土率相关损伤模型的重力坝地震动超载响应分析[J].水利学报,2006,37(7):820-826.
[8]黄劲松,潘燕芳,闫慧玉.大朝山碾压混凝土重力坝静动力有限元计算分析[J].武汉大学(工学版),2003,36(6):22-26.
[2]张社荣,卢向丽.拱形重力坝地震动力反应分析[J].水力发电学报,2004,23(2):65-68.
[3]何发祥,王忠,刘浩吾.采用无质量地基模型时动力平衡方程的缩减[J].四川大学学报(工程科学版),2000,32(4):7-10.
[4]朱境清.结构抗震分析原理[M].北京:地震出版社,2002.
[5]刘国明.古田溪一级重力坝悬臂梁振型分解反应谱法抗震计算[J].水力发电学报,2004,23(1):31-35.
[6]刘国明.古田溪三级平板支墩坝动抗滑稳定分析[J].水利学报,2000,(1):54-59.
[7]白卫峰,陈健云,钟红.基于混凝土率相关损伤模型的重力坝地震动超载响应分析[J].水利学报,2006,37(7):820-826.
[8]黄劲松,潘燕芳,闫慧玉.大朝山碾压混凝土重力坝静动力有限元计算分析[J].武汉大学(工学版),2003,36(6):22-26.
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