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以位移控制加载,进行了具有不同锈蚀率和不同剪跨比的锈蚀无腹筋钢筋混凝土梁的四点受弯加载试验。试验中,以人工和电化加速锈蚀两种方法除去支座间钢筋和混凝土之间的粘结应力。通过锈蚀无腹筋钢筋混凝土梁的纵筋应变分布,计算各加载水平下的纵筋与混凝土之间的粘结应力分布。试验表明,剪跨比较小的锈蚀无腹筋钢筋混凝土梁中的拱效应较强,剪跨比较大的拱效应较弱;加载后期阶段,锚固区域的平均粘结应力显著增大,当锚固区域的粘结性能不能维持拱肋的平衡时,锈蚀无腹筋钢筋混凝土梁即发生破坏。对于承载机理为拱效应的锈蚀无腹筋钢筋混凝土梁,剪跨比和锚固区域的粘结性能是影响其极限承载力的重要因素。根据试验结果,拟合出了极限承载力与两因素之间的关系,且具有良好的适用性。
Four-point flexural loading tests of corroded and non-web reinforced concrete beams with different corrosion rates and different shear-span ratios were carried out with displacement control loading. In the experiment, two methods of artificial and galvanic corrosion were used to remove the bond stress between the steel bar and the concrete. Through the longitudinal reinforcement strain distribution of the corroded reinforced concrete beam without web reinforcement, the distribution of the bond stress between the longitudinal reinforcement and the concrete at each loading level is calculated. The results show that the arching effect is stronger in the corroded reinforced web without corbel, and the arching effect with larger shear span is weaker. In the late loading stage, the average bond stress in the anchored area increases significantly. When the anchorage zone Bond performance can not maintain the balance of arch ribs, the corrosion of non-web reinforced concrete beams that is destroyed. For corroded reinforced non-reinforced concrete beams with arch effect, the shear span ratio and the anchorage zone’s adhesion are the important factors affecting the ultimate bearing capacity. According to the test results, the relationship between the ultimate bearing capacity and two factors is fitted and has good applicability.