摘要
本文采用随机振动理论与有限元技术相结合的方法,以基岩随机地震作为输入,对群桩基础和土-桩-结构相互作用体系进行了三维随机地震反应分析。文中首先以-3×3群桩基础作为分析模型,探讨了桩-土-桩动力相互作用对承台随机地震反应的影响;然后,用单自由度体系模拟上部结构,分析了上部结构惯性对桩基承台随机地震反应的影响。在此基础上,以某桥桥墩为背景,用多自由度体系模拟上部结构,建立了土-桩-结构相互作用体系的三维分析模型,获得了桩基承台的功率谱响应、以及桩顶处的主应力标准差和主应力速率标准差等结果,探讨了群桩顶部各桩主应力标准差的分布规律,得到了一些有应用价值的结果。
The random seismic response of grouped pile and soil pile superstructure interaction system were investigated by using 3-D model. The analysis method was based on the random vibration theory and finite element method, and the stochastic earthquake motion at bedrock was applied to the primitive input. First, a 3×3 pile foundation was used as analysis model, and the effect of pile soil pile interaction on the random seismic response of footing was analyzed. Next, the superstructure was modeled by single degree freedom systems, and the effect of superstructure inertia on the random seismic response of soil pile structure interaction system was also discussed. Finally, the 3-D model of soil pile superstructure interaction system was established by the engineering background of a bridge pier, and the response power density of footing and the standard deviation of piles were calculated. The standard deviation distribution of the pile group was shown.
出处
《力学季刊》
CSCD
北大核心
2004年第3期417-423,共7页
Chinese Quarterly of Mechanics
基金
国家自然科学基金资助项目(59895410)
关键词
土-桩-结构相互作用
随机地震反应
影响机理分析
三维模型
soil pile superstructure interaction
random seismic response
influencing mechanism analysis
3-D model
