二次受力钢筋砼连续迭合梁斜截面强度试验研究

Experimental Research for Shear Strength of Diagonal Section of Reinforced Concrete Continuous Composite Beam under Two-stage-loading

本文通过对二次受力钢筋砼连续迭合梁斜截面受力性能的试验研究,探讨了其斜截面二次受力特点,分析了截面剪应力重分布的过程。指出,随截面剪应力重分布的发展,该种梁与相应一次受力对比梁的差异逐渐减小,至极限破坏时,差异基本消失。从而从机理上解释了“迭合梁抗剪强度此相应整浇梁不会降低”这一尚未研究清楚的客观现象。在此基础上,本文提出了斜截面抗剪强度计算公式。

The bearing caractristics of diagonal section and the redistribution of shear stress of reinforced concrete continuous composite beam under two- stage-loading have been studied in this paper by means of experiments. It is pointed that the difference between this type of beam and its corr- esponding one-stage-loading beam decrease gradually with its stress red- istribution and disappear with its failure.Therefore,the actual experi- ment result-no decrease in shear strength of composite be am as compa- red with its corresponding integrated cast beam can be explained.Based on this conclusion,the formula of calculation on shear strength have been devoloped.