基于振动台模型试验的管桩-土-上部结构体系的地震响应试验研究

摘要

By shaking table testing of a tube pile model, this paper investigates acceleration amplification factor distribution on superstructure and maximum shear and overturning moment on the top of the pile under earthquakes for a single pile foundation structure system. Studies show that seismic responses of the pipe pile structural system were affected not only by the input acceleration amplitude, but also superstructure and site characteristics. The structure earthquake responses are more related to structural characteristics on the hard site; while they are more associated with the site condition on the soft site. The actual pile -soil-superstructure system is not a simple structure; the overall dynamic characteristics of the upper and lower structure must be considered as an integrated system.%通过管桩振动台模型试脸,研究了地震作用下单桩基础结构体系的上部结构加速度放大系数、桩顶最大剪力和最大倾覆弯矩响应幅值的分布规律及其影响因素.研究表明,管桩结构体系的各种地震响应不仅与输入的加速度幅值有关,不同的上部结构和场地的动力特性也影响管桩基础地震响应幅值的变化趋势；坚硬场地上结构的地震反应与结构有关,软弱场地上结构的地震响应与场地有关；实际桩-土-上部结构体系不是一个简单结构,必须整体考虑上部和下部结构的动力特性.