锈蚀-疲劳耦合作用下钢筋混凝土梁挠度计算方法研究  

DEFLECTION CALCULATION OF REINFORCED CONCRETE BEAMS UNDER CORROSION-FATIGUE COUPLING ACTION

作　　者：李鹏飞[1] 许乐欣 毛燕[1] 韩旭[1] 董振华[1] LI Peng-fei;XU Le-xin;MAO Yan;HAN Xu;DONG Zhen-hua(Research Institute of Highway Ministry of Transport,Beijing 100088,China;School of Transportation Engineering,Dalian Maritime University,Dalian,Liaoning 116026,China;Shandong Jinqu Consulting Design Co.LTD,Jinan,Shandong 250014,China)

机构地区：[1]交通运输部公路科学研究院,北京100088 [2]大连海事大学交通运输工程学院,辽宁大连116026 [3]山东金衢咨询设计有限公司,山东济南250014

出　　处：《工程力学》2023年第S01期207-212,247,共7页Engineering Mechanics

基　　金：广东省重点领域研发计划资助项目(2019B111106002);国家重点研发计划项目(2021YFB3202900);中央级公益性科研院所基本科研业务费专项资金项目(2022-9048)。

摘　　要：为探究锈蚀-疲劳耦合作用下钢筋混凝土梁的结构力学行为及刚度退化规律,设计了3组不同应力幅作用的钢筋混凝土梁锈蚀-疲劳耦合持荷试验,分析了各试验梁的疲劳寿命及刚度演化规律。结果表明,钢筋、混凝土疲劳和钢筋的锈蚀耦合作用下,钢筋混凝土构件的疲劳寿命显著降低,疲劳梁和锈蚀疲劳耦合梁的挠度发展曲线均呈现“突增-稳定-突增”的变化规律,且锈蚀疲劳耦合梁在第二阶段的挠度发展速率要远大于同应力幅下的疲劳加载梁。该方法在既有规范基础上分别改进了现有疲劳梁和锈蚀疲劳耦合作用下结构的挠度计算方法,可以有效考虑钢筋疲劳作用、外荷载应力幅、混凝土模量退化、钢筋锈蚀等因素的影响,其计算值与试验值吻合较好,验证了该文提出的刚度计算模型的有效性。Three sets of corrosion-fatigue coupling bearing tests of reinforced concrete(RC)beams under different stress amplitudes are designed to study the structural mechanical behavior and stiffness degradation of reinforced concrete beams under corrosion-fatigue coupling effect,and the fatigue life and stiffness evolution law of each test beam are analyzed as well.The results indicate that,the coupling effect of corrosion and fatigue reduces the fatigue life of reinforced concrete members,and the deflection development curves of fatigue beams and corrosion-fatigue coupled beams both show a'sudden increase-stable-sudden increase'change law.And the deflection development rate in the second stage is much larger than that of the fatigue-loaded beam under the same stress amplitude.On the basis of existing codes,the stiffness calculation method of existing fatigue beams and corrosion-fatigue coupled beams is improved.The proposed method systematically considers the effects of fatigue,stress amplitude,concrete elastic modulus degradation and steel corrosion.And a good agreement is observed between theoretical results and experimental values,which verifies the accuracy of the stiffness calculation model.

关 键 词：桥梁工程 钢筋混凝土梁 锈蚀-疲劳 耦合作用 刚度退化 

分 类 号：TU375.1[建筑科学—结构工程]