地震动峰值速度对地下隧洞内力的影响研究
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摘要
本文利用混合模拟方法,合成了加速度反应谱及峰值位移相同,而峰值速度不同的两组人工地震动时程。同时选择典型隧洞,进行了弹塑性地震反应分析,研究了地震波水平输入时,地震动峰值速度对隧洞内力的影响。在软土场地中,当加速度反应谱及峰值位移相同时,峰值速度较大的地震动时程将引起隧洞较大的弯矩和剪力。在硬土场地中,峰值速度对隧洞弯矩和剪力的影响较复杂,没有明显规律,某些单元的弯矩和剪力可能会明显增大。峰值速度对隧洞单元轴力的影响较小。在进行地下隧洞设计的地震动参数确定时,应合理考虑峰值速度的影响。
A hybrid simulation method is used to generate two group artificial ground motions that are compatible with the same response spectrum of absolute acceleration and same peak displacement,but different peak velocities.The elastic-plastic seismic response analyses of underground tunnel are performed.The influence of peak ground velocity (PGV) on the internal force of underground tunnel are studied.For the time histories with the same response spectrum and same peak displacement,the larger PGV will cause the larger moment and shear force for the underground tunnel in soft soil site.The influence of PGV on the moment and shear force of the tunnel in stiff soil site is irregular.The moment and shear force of some tunnel elements can be increased obviously. The PGV has less effect on the axial force of the underground tunnel. The influence of peak velocity should be considered reasonably in determination of design ground motion parameters for underground tunnels.
A hybrid simulation method is used to generate two group artificial ground motions that are compatible with the same response spectrum of absolute acceleration and same peak displacement,but different peak velocities.The elastic-plastic seismic response analyses of underground tunnel are performed.The influence of peak ground velocity (PGV) on the internal force of underground tunnel are studied.For the time histories with the same response spectrum and same peak displacement,the larger PGV will cause the larger moment and shear force for the underground tunnel in soft soil site.The influence of PGV on the moment and shear force of the tunnel in stiff soil site is irregular.The moment and shear force of some tunnel elements can be increased obviously. The PGV has less effect on the axial force of the underground tunnel. The influence of peak velocity should be considered reasonably in determination of design ground motion parameters for underground tunnels.
引文
陈国兴,庄海洋,徐烨,2004.软弱地基浅埋隧洞对场地设计地震动的影响.岩土工程学报,26(6):739—744.
高学奎,朱唏,2005.近场地震动输入问题的研究.华北科技学院学报,2(3):80—83.
谷拴成,朱彬,杨鹏,2006.地下结构地震反应非线性分析.地下空间与工程学报,2(5):748—752.
蒋英礼,2009.软土地铁车站地震作用下的响应分析[硕士学位论文].北京:北京交通大学.
于品清,2009.软土地下结构地震反应及其环境影响评价[硕士学位论文].大连:大连理工大学.
赵凤新,张郁山,2006a.拟合峰值速度与目标反应谱的人造地震动.地震学报,28(4):429—437.
赵凤新,张郁山,2007.拟合峰值位移与目标反应谱的人造地震动.核动力工程,28(2):38—41.
庄海洋,2006.土-地下结构非线性动力相互作用及其大型振动台试验研究[博士学位论文].南京:南京工业大学.
周媛,2006.地震动速度与位移对大跨斜拉桥地震反应影响的研究[硕士学位论文].北京:中国地震局地球物理研究所.
中华人民共和国国家标准,2008.《建筑抗震设计规范(GB50011-2001)》(2008年修订版).北京:中国建筑工业出版社.
Hashash Y.M.A.,Hook J.J.,Schmidt B.,2001.Seismic design and analysis of underground structures.Tunneling and Underground Space Technology,16(6):247—293.
Zhao Fengxin,Zhang Yushan,Lu Hongshan,2006b.Artificial ground motion compatible with specified ground shaking peaks and target response spectrum.Earthquake Engineering and Engineering Vibration,5(1):41—48.
高学奎,朱唏,2005.近场地震动输入问题的研究.华北科技学院学报,2(3):80—83.
谷拴成,朱彬,杨鹏,2006.地下结构地震反应非线性分析.地下空间与工程学报,2(5):748—752.
蒋英礼,2009.软土地铁车站地震作用下的响应分析[硕士学位论文].北京:北京交通大学.
于品清,2009.软土地下结构地震反应及其环境影响评价[硕士学位论文].大连:大连理工大学.
赵凤新,张郁山,2006a.拟合峰值速度与目标反应谱的人造地震动.地震学报,28(4):429—437.
赵凤新,张郁山,2007.拟合峰值位移与目标反应谱的人造地震动.核动力工程,28(2):38—41.
庄海洋,2006.土-地下结构非线性动力相互作用及其大型振动台试验研究[博士学位论文].南京:南京工业大学.
周媛,2006.地震动速度与位移对大跨斜拉桥地震反应影响的研究[硕士学位论文].北京:中国地震局地球物理研究所.
中华人民共和国国家标准,2008.《建筑抗震设计规范(GB50011-2001)》(2008年修订版).北京:中国建筑工业出版社.
Hashash Y.M.A.,Hook J.J.,Schmidt B.,2001.Seismic design and analysis of underground structures.Tunneling and Underground Space Technology,16(6):247—293.
Zhao Fengxin,Zhang Yushan,Lu Hongshan,2006b.Artificial ground motion compatible with specified ground shaking peaks and target response spectrum.Earthquake Engineering and Engineering Vibration,5(1):41—48.
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