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.
出处
《震灾防御技术》
2011年第2期105-115,共11页
Technology for Earthquake Disaster Prevention
基金
地震科学基金(编号A08109)资助
关键词
人造地震动
峰值速度
隧洞内力
地震反应
内力
Artificial ground motion
PGV
Underground tunnel
Seismic response
Internal force
