Longitudinal Seismic Response of Large Sectional Shield Tunnel
In this paper,seismic deformation method is applied to analysis the longitudinal seismic re -sponse of the shield tunnel for the specific project across Yangtze River in Nanjing. The shield tunnel is simplified to a line beam to establish equivalent continuous model , which has the same longitudinal deformation with the shield tunnel. The axial force and bending moment are simultaneously considered in calculating and the pre-stress of bolts is also considered. According to the impact of the inputting angle and the level of strong motion , inputting is divided into the following cases : inputting by PGV= 0.15m/s(equivalent to 7 degrees seismic fortification intensity)and PGV=0.30m/s(equivalent to 8 degrees seismic fortification intensity) ,incident angles are respectively 0° ,30° ,45° ,60°. Then,the results by seismic deformation method are compared with that by the 3-D finite element method ,and the similar results can be obtained. The results indicate that: (1) Seismic deformation method is a simple and practical tool for engineering application ,e. g. for longitudinal seismic response analysis of large sectional shield tunnel;(2) Amount of joint opening is directly obtained by seismic deformation meth -od,as an important parameter for the anti-seismic design of shield tunnel,which is recommended as a dynamic indicator for evaluation and control of structure response during large earthquake occurring ; (3)Incident angle and level of inputting strong motion (acceleration, velocity and displacement)have an important effect on longitudinal seismic analysis ,the most unfavorable load case should be selected as a control condition for design and study of engineering.
Runmeng SHAO Homing ZHAO
School of Civil Engineering ,Beijing Jiaotong University ,Beijing 100044,China Institute of Foundati School of Civil Engineering ,Beijing Jiaotong University ,Beijing 100044,China
国际会议
5th International Symposium on Environmental Vibration(第五届环境振动国际研讨会)
成都
英文
313-319
2011-10-20（万方平台首次上网日期，不代表论文的发表时间）