平钢板-UHPC组合桥面板负弯矩区超高周疲劳性能  

ULTRA-HIGH CYCLE FATIGUE PERFORMANCE OF FLAT STEEL PLATE-UHPC COMPOSITE BRIDGE DECK IN NEGATIVE MOMENT REGIONS

作　　者：贺龙飞 谭珂 李传习[1] 张永明 施宇 杨腾宇 裴必达 HE Long-fei;TAN Ke;LI Chuan-xi;ZHANG Yong-ming;SHI Yu;YANG Teng-yu;PEI Bi-da(Key Laboratory of Green Construction and Maintenance of Bridges and Buildings of Hu’nan Province,Key Laboratory of Safety Control for Bridge Engineering of the Ministry of Education,Changsha University of Science&Technology,Changsha,Hu’nan 410004,China;Foshan Jianying Development Group Co.,Ltd,Foshan,Guangdong 528000,China;Foshan Transportation Technology Co.,Ltd,Foshan,Guangdong 528000,China)

机构地区：[1]长沙理工大学桥梁与建筑绿色建造与维护湖南省重点实验室,桥梁工程安全控制教育部重点实验室,湖南长沙410004 [2]佛山市建盈发展有限公司,广东佛山528000 [3]佛山市交通科技有限公司,广东佛山528000

出　　处：《工程力学》2025年第3期203-216,共14页Engineering Mechanics

基　　金：国家自然科学基金项目(52078059,51808055);湖南交通科技项目(202016);湖南省研究生科研创新项目(CX20210767);湖南省自然科学基金项目(2021JJ40593)。

摘　　要：为了进一步研究平钢板-UHPC组合桥面板在疲劳荷载下的受力性能,基于某大跨径组合梁斜拉桥的桥面板设计,进行了2块不同配筋率(1.69%、1.86%)足尺模型的超高周负弯矩疲劳荷载试验及其研究。疲劳试验中,研究了试件裂缝宽度、刚度、UHPC应变、受拉钢筋应变、钢板应变随循环加载次数的变化规律。试验结果表明:以裂缝宽度0.1 mm为寿命标准,在荷载比R为0.25、荷载水平S≥0.8的疲劳荷载作用下,平钢板-UHPC组合桥面板裂缝宽度随循环次数增长缓慢,其疲劳寿命不低于1600万次;平钢板-UHPC组合桥面板刚度随循环次数增加缓慢下降,抗负弯极限承载力几乎没有衰减;受拉钢筋对UHPC的约束作用抑制了裂缝沿深度方向的扩展,使得在UHPC表面至顶层纵向钢筋之间存在钢纤维可能疲劳拔断区域;当该区域深度有限时,其对钢-UHPC组合桥面板抗负弯疲劳性能及剩余承载力下降的影响可忽略不计。平钢板-UHPC组合桥面板的疲劳设计应是防止裂缝宽度过大引起锈蚀的耐久性控制。In order to further study the mechanical properties of the flat steel plate-UHPC composite bridge deck under fatigue load,according to the bridge deck design of an ultra-long-span composite cable-stayed bridge,a ultra-high cycle fatigue tests with negative moment of two full-scale models with different reinforcement ratios(1.69%and 1.86%)were carried out.During the test,the variation patterns of crack width,stiffness,UHPC strain,tensile reinforcement strain,and steel plate strain of the specimens with the number of loading cycles were investigated.The test results showed that:Using a crack width of 0.1 mm as the service life criterion,under fatigue loading conditions with a load ratio R of 0.25 and a load level S of 0.8 or greater,the crack width in the flat steel plate-UHPC composite bridge deck increases slowly as the number of cycles increases,and the fatigue life is no less than 16 million cycles.;The stiffness of the flat steel plate-UHPC composite bridge deck decreased slowly with the increase of fatigue cycles,while the ultimate bearing capacity under hogging moment almost no degradation;The restraining effect of tensile reinforcement on the UHPC restrict the propagation of cracks along the depth direction,making a region of possible fatigue pull-out of steel fibers between the UHPC surface and the top longitudinal reinforcement.When the depth of this area was limited,it’s influence on the degradation of the fatigue performance and residual bearing capacity of flat steel plate-UHPC composite bridge deck under hogging moment can be ignored.The fatigue design of the flat steel plate-UHPC composite bridge deck should be controlled by the durability that prevent corrosion caused by excessive crack width.

关 键 词：桥梁工程 平钢板-UHPC组合桥面板 试验研究 超高周疲劳性能 疲劳损伤机理 

分 类 号：TU398[建筑科学—结构工程] U443.32[建筑科学—桥梁与隧道工程]