有软弱下卧层柱下条形基础的简便计算

Simpie Mathod for Caloulating of Strip Foundation of Piles Under Columu with Soft Soil Layer Beneath

本文根据国家建筑地基基础设计规范，推导出一种同时考虑基础持力层及软弱下卧层的承载力，基础形式是十字交叉条形梁，首先要将上部传给柱子的荷载按梁的刚度分配荷载，经过一次计算即可得出条形基础底面合适尺寸的计算方法，就不必进行软弱下卧层的承载力验算，当地基比较均匀，荷载分布也较均匀，上部结构刚度较好，基础梁按连续梁计算（倒梁法），否则可用基床系数法计算条形基础梁的内力，也可用半无限弹性体法计算基础梁的内力。

According to the national standard of the designing of building base, a mew algorithm of carrying capacity regarding of the bearing layer of the base and the lower soft layer is put forward, that the base style is decussate strip beam, first the load of columm transfering from above being distributed refering to its rigidity, and the computation method of the proper dimension of the strip base is gained through one time of computation, and the proof computation of bearing capacity of lower soft laye is unnecessary. If the ground and the distribution of load is symmetrical, and if the rigidity of upper structure is well, the base beam should be computated as a continuous beam, otherwise the inner stress of base strip beam should be computated by the method of basic coefficient, or by the method or by the method of half infinite elasticity.