高层建筑的结构刚度对箱形基础性状的影响  

Influence of superstructure stiffness on performance of box foundation

作　　者：陈卫[1] 赵锡宏[1] 

机构地区：[1]同济大学地下建筑与工程系,上海200092

出　　处：《建筑结构》2009年第8期99-102,65,共5页Building Structure

摘　　要：对9个箱形基础工程实测结果的定量分析表明,上部结构刚度增长存在一个临界层数(界限高度):当建造到某一结构层后,上部结构刚度形成,基础与上部结构接近一个刚性体整体工作;基础沉降和地基反力等量增长,其曲线形状基本保持不变;箱形基础底板钢筋应力开始下降或基本不变;竖向刚度趋向于最大值。根据高层建筑与深梁工作性状的可比性,对于箱形基础,可以把0.3,0.5和0.7倍的基础长度作为剪力墙、框剪、框架结构上部刚度界限高度的初步判别。The field experiment data of 9 box foundation engineering cases show that there is a critical number of floors （critical height）. Furthermore, these test results also show that the stiffness of superstructure is formed, the foundation and superstructure interaction behaves near to a rigid body after some floors constructed, then, the measured settlement and foundation pressure increase equivalently, their shape of curves keeps almost constant, stress of steel bar in slab of box foundation basically decreases or is unchanged and the vertical stiffness tends toward the largest. By means of the consistency of the working performance between high-rise building and deep beam, a preliminary method is also put forward that 0. 3, 0. 5 and 0.7 times of the length of foundation can be taken as the critical height for influence range of stiffness of shear wall, frame-shear wall and frame structure on box. foundation, respectively.

关 键 词：地基基础 上部结构 共同作用 临界层数 界限高度 上部结构刚度 

分 类 号：TU753[建筑科学—建筑技术科学] TU311.2