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一、概述钢筋混凝土平腹杆双肢柱系一单跨多层框架,其特点是跨度小,腹杆刚度大。为简化计算,各杆件的弯矩一般均采用整体弯曲和局部弯曲相叠加的原理。目前,国内推荐的近似计算法大致可分为三种:一是将钢筋混凝土平腹杆双肢柱完全看作弹性体系计算杆件内力(简称弹性法);二是在按弹性方法分析双肢柱各杆件内力时,考虑了混凝土产生裂缝等非弹性变形的影响,拉肢取混凝土开裂后的刚度(简称弹塑性法);三是在第二种方法的基础上,取双肢柱的拉肢刚度为零(简称极限法)。不难看出,弹性法和
I. Overview Reinforced concrete flat-seat double-limb column-single-span multi-story frame is characterized by small span and large stiffness of the web. In order to simplify the calculation, the bending moment of each member generally adopts the principle of superposition and partial bending. At present, the domestically recommended approximate calculation method can be roughly divided into three types: First, the double-limbed column of reinforced concrete plane-abdominal rod is completely regarded as the elastic system to calculate the internal force of the rod (abbreviated as elastic method); the second method is to analyze the double limbs by the elastic method. When the internal forces of the columns are taken into account, the effect of inelastic deformation such as concrete cracks is taken into account. The stiffness of the cracked concrete after cracking is used (referred to as the elasto-plastic method); the third method is based on the second method. The limb stiffness is zero (abbreviated as the limit method). It is not difficult to see that the elastic law and