型钢混凝土梁受弯刚度计算

Computation of Flexural Rigidity of Steel Reinforced Concrete Beam

根据平截面假定和型钢混凝土共同变形假定,推导出型钢混凝土梁刚度与钢筋混凝土及型钢刚度的迭加关系.利用现行混凝土结构设计规范中刚度计算的有关公式,在对中和轴位置和考虑型钢受拉翼缘影响的裂缝间钢筋应力不均匀系数等进行近似处理后,给出了型钢混凝土梁刚度计算公式及其简化公式.给出的计算公式与试验结果吻合较好,可供工程技术人员参考.

Based on the assumptions that a plane section before bending remains a plane after bending and no relative movement takes place between steel and concrete, an expression for the flexural rigidity of steel reinforced concrete (SRC) beams as a function of the rigidities of steel and concrete was derived. The approximate and simplified formulas for calculating the flexural rigidity of SRC beams were proposed based on the expression, the relevant formulas given in the Chinese current design codes for concrete structures, the approximate position of neutral axis and the approximate stress factor of the reinforcement including the tensile flange of steel. The proposed formulas agree well with experimental results and may be used as a reference for structural engineers.