【摘要】 以位移控制加载,进行了深度锈蚀的无腹筋钢筋混凝土梁的四点受弯加载试验。通过锈蚀梁的纵筋的应变分布,计算各加载水平下纵筋与混凝土之间的粘结应力。试验表明,深度锈蚀梁和非锈蚀梁的应变分布和应力历程有着明显的差异;加载初期阶段,剪跨区域的平均粘结应力逐步增加至峰值,锚固区域的平均粘结应力无明显增加;加载后期阶段,剪跨区域的平均粘结应力逐步降低,而锚固区域的平均粘结应力显著增加;随着荷载的增加,深度锈蚀梁的承载机理由"梁效应"向"拱效应"转变。基于"拱效应"的受力特征,提出了深度锈蚀梁极限荷载的计算方法。更多还原

【Abstract】 Four-point static bending tests of the seriously corroded reinforced concrete beam were conducted under displacement control. The bond stress between the main rebar and the concrete at any load level was computed,based on the longitudinal strain of the main rebar. It can be concluded that the strain distribution and the bond stress history of the seriously corroded reinforced concrete beam are different from that of non-corroded beam. The bond stress in the shear span increases to peak value and the bond stress in the anchorage region dose not increase significantly at the early loading stage. But the bond stress in the shear span decreases and the bond stress in the anchorage region is extremely higher at the later loading stage. With the increase of the applied load,arch action,instead of beam action,has achieved a dominant position in the seriously corroded reinforced concrete beam. The calculating method of the ultimate strength for the seriously corroded reinforced concrete beam was proposed based on the arch action.更多还原