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现行钢筋混凝土结构设计规范(TJ10—74)仅给出了两跨及两跨以上、且总宽度不小于高度1/3的多层房屋中钢筋混凝土柱的计算长度;而且所给的计算长度值不完全合适,不能满足各种类型框架结构的设计要求。在这次修订工作中,根据理论分析结果及国内外经验,重新拟定了框架柱计算长度的条文。现简要介绍如下。在偏心受压杆件的强度计算中,需要考虑轴向力在已变形的杆件中引起的附加弯矩。由于精确计算各类杆系结构中偏心压杆附加弯矩的工作量过大,目前各国规范多是采用近似方法来进行计算。即根据结构中某根钢筋混凝土柱的截面几何特征、材料等级
The current reinforced concrete structure design specification (TJ 10-74) only gives the calculated length of reinforced concrete columns in multistory buildings with two spans or more and two or more spans and a total width of not less than 1/3 of the height; and the calculated length is given. Not completely suitable, can not meet the design requirements of various types of frame structures. In this revision work, based on the theoretical analysis results and experiences at home and abroad, the clauses for the calculation of the length of the frame columns have been redrafted. The brief introduction is as follows. In the calculation of the strength of the eccentrically compressed bar, the additional bending moment caused by the axial force in the deformed bar needs to be considered. Due to the fact that the workload of the eccentric bending bar additional bending moments in the calculation of various rod structure structures is excessive, the current national standards mostly adopt approximate methods for calculation. That is, according to the cross-sectional geometry and material grade of a certain reinforced concrete column in the structure