钢筋混凝土短梁挠度的研究

Research on Deflection of R.C.Short Beams

分析了钢筋混凝土简支短梁和连续短梁实测荷载-挠度曲线的特征,剪切斜裂缝的出现引起钢筋混凝土短梁荷载-挠度曲线的明显转折,剪切刚度和剪切变形对钢筋混凝土短梁的挠度有较大影响.斜裂缝出现后,箍筋和水平腹筋对钢筋混凝土短梁的剪切刚度有较大影响,从而对钢筋混凝土短梁的挠度产生较大影响.对钢筋混凝土短梁,只考虑弯曲变形按现行设计规范计算所得挠度与试验实测挠度误差显著,剪切效应对钢筋混凝土短梁挠度的影响不可忽略.

According to others＇ and the author＇ s test results, the characteristic of the load - deflection curve of R. C. short beams with simple supports and continuous supports is analysed. The turning point of the load - deflection curve is induced by the inclined cracks. The deflection of the short beam is influenced largely by the shear rigidity and the shear deformation. After the inclined cracks appear, stirrups and horizontal web reinforcements have large effects on the shear rigidity and the deflection of short beams. The calculating results according to the current design code are not consistent with the test results, and the effect of shear on the deflection can not be ignored.