钢筋混凝土梁长期荷载下挠度近似计算方法

An Approximate Method for Deflection Calculation of Reinforced Concrete Beam under Long Term Loads

长期荷载作用下钢筋混凝土梁的挠度受荷载、混凝土收缩及徐变等多种因素影响，其变形是非线性的．本文用梁开裂后的“平均”截面，提出了近似计算方法．求解变形时，受压区取“平均”截面中的２／３面积，并考虑应力均匀分布；受拉区考虑了钢筋对混凝土变形的约束作用．

The deflection of reinforced concrete beam under long term loads is non linear.This paper describes an approximate calculation method.An ′average′ cross section is proposed for the cracked region of a beam which contains an area of tensile concrete located at the tensile level to account for tension stiffening.Creep and shrinkage induced curvatures are calculated separately.A comparison with test data is made.