【摘要】 采用改进的Penzien模型 ,利用研制开发的桩 -土 -杆系结构动力相互作用分析程序DIPSFSA ,对带支撑和不带支撑的钢框架均按刚性基础和考虑桩土参与作用两种情况进行地震反应分析 ,研究上部结构刚度改变对桩 -土 -结构动力相互作用的影响。结果表明 ,在Ⅲ、Ⅳ类场地土条件下 ,无论上部结构是否加设支撑 ,桩土参与共同工作对上部结构地震反应均有不容忽视的影响 ,且上部结构相对于地基的刚度越大 ,桩 -土 -上部结构之间的共同工作效果越明显。从而说明 ,软土地基上结构刚度越大 ,结构不一定越安全。更多还原

【Abstract】 By using improved Penzien model,the seismic response analysis of the steel frame either with brace or without brace is carried out respectively according to the rigid foundation and interaction considering the pile-soil-frame structure.The influence of dynamic interaction on the pile-soil-frame structure due to the stiffness variation of superstructure is researched.The result indicates that on the site Ⅲ、Ⅳ whether the superstructure is with brace or not,it should not be neglected for the influence of seismic response on the superstructure due to the dynamic interaction of the pile-soil super structure.Furthermore,greater the stiffness ratio of superstructure to the foundation is,the effect of dynamic interaction is clearer.Therefore,greater structural stiffness is situated on the soft foundation,the structure is not necessarily safer.更多还原