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现行 TJ10—74《钢筋混凝土结构设计规范》中,偏压构件正截面强度计算从下列原则出发:1.计算区分为大小偏心两种情况,界限条件为 S_n=0.8S_0,对矩形截面也就是 X=0.55h_0。2.大偏心受压构件计算所采用的应力图形是折算的等效矩形(本文只讨论矩形截面的偏压构件)其折算强度 R_w=1.25R_a;小偏心构件计算中,由于采用所谓的“内力矩守恒”,内力图形是一个由截面确定的图形——长为0.55h_0、宽为1.25R_a 的矩形。
In the current TJ10-74 “Code for Design of Reinforced Concrete Structures”, the calculation of the normal section strength of a biased member is based on the following principles: 1. The calculation is divided into two cases, size and eccentricity. The boundary condition is S_n=0.8S_0, and the rectangular section is X. =0.55h_0. 2. The stress pattern used for the calculation of the large eccentricity compressive member is the equivalent equivalent rectangle (this article only discusses the bias member with rectangular cross section) and its conversion strength R_w=1.25R_a; The so-called “conservation of internal moments”, the internal force pattern is a shape determined by the cross section - a rectangle with a length of 0.55h_0 and a width of 1.25R_a.