环形基础的基底反力公式理论解  

Base Pressures Theoretical Formulafor Ring Foundations

作　　者：谢信江 Xie Xinjiang(Sichuan Electric Power Design&Consulting Co.,Ltd.,Chengdu 610041,China)

机构地区：[1]四川电力设计咨询有限责任公司,成都610041

出　　处：《特种结构》2020年第1期94-101,共8页Special Structures

摘　　要：对于在偏心荷载作用下与地基脱开的环形基础,需要通过现行高耸规范查表来计算基底反力,但规范中计算系数表格的脱开面积适用范围有限。本文分析了在偏心荷载作用下出现局部脱空情形环形基础的基底反力(接触应力、基底压力)分布,推导完成了其轴力、弯矩的计算公式,提炼出广义通用公式。并进一步地将通用公式的计算适用范围推广到基底全压情形。经验证,推导公式代入数值后计算结果与现行高耸规范附录中的计算系数表等资料结果高度一致。推广后的通用公式可对环(圆)形基础在任意轴力、弯矩下的线性基底反力分布实现精确求解。本文可为实际工程计算和高耸规范修编提供参考。To calculate the base pressure of ring foundations under eccentric load,it is normally based on the coefficient table in the Code"design of high-rise structures".However,the application scope of this table is limited.In this paper,the distribution of ring foundations base reaction force(contact stress,base pressure)with partial released area under eccentric load is analyzed.The formulas for calculating the axial force and bending moment are derived,and a generalized formula is also extracted.Then the application of this generalized formula is further extended to the case with fully compression.The calculation results of the formula are highly consistent with the results based on coefficient table in the design code appendix.Thus,it is verified that this generalized formula can be used to accurately calculate the ring(circular)foundation base pressure distribution under axial forces and bending moments.This paper can provide references for practical projects and the Code"design of high-rise structures"revision.

关 键 词：环形基础 基底反力 轴力 弯矩 公式推导 

分 类 号：TU470[建筑科学—结构工程]