疲劳荷载下锈蚀配筋混凝土梁的力学性能研究综述

Review on Mechanical Property of Corroded Reinforced Concrete Beam Under Fatigue Load

在车辆周期反复荷载和环境侵蚀共同作用下,配筋混凝土桥梁疲劳和耐久性问题日益突出,为深入研究疲劳荷载和环境侵蚀的影响和作用规律,梳理分析锈蚀钢筋疲劳性能、混凝土疲劳性能、疲劳荷载和环境侵蚀作用下钢筋与混凝土黏结性能的研究。经归纳总结发现,由于混凝土材料的非匀质性和钢筋锈蚀方法的差异性,试验研究结果具有较大的离散性,需要创新发展材料疲劳性能测试方法和多因素耦合作用下黏结性能测试方法;依据试验结果进行拟合建立的黏结强度、黏结滑移本构关系,还需结合使用环境条件、约束条件进一步完善;依据连续介质力学推导的黏结强度和黏结滑移本构关系,计算参数确定和工程验证研究需要进一步深入。

The fatigue and durability of reinforced concrete bridges are increasingly prominent while bridges are subjected to the combined actions of vehicle fatigue loads and environmental corrosion.To deeply study the effects of combined actions on the fatigue properties of RC members,the literature review is made from 3 aspects of fatigue properties of rusted reinforcement,fatigue properties of concrete,and fatigue properties of bonding between concrete and reinforcement bar.The result indicates that the obtained experimental results have a large dispersion due to the inhomogeneity of concrete and the difference in rusting methods of reinforcement.It is necessary to innovate and develop the test methods for fatigue property and bonding property under the action of multi-factors.The bonding strength and bond-slip constitutive relationship,which are proposed by fitting the experimental data,are still needed to be improved with considering the environmental and restraint conditions.The bonding strength and bond-slip constitutive relationship,which are derived from continuum mechanics,are needed to be verified in practice further.The calculation parameters are determined precisely.