轻量化STC-钢组合桥面板静力性能研究  

Research on static performance of lightweight STC-steel composite deck

作　　者：李传习[1,2] 雷智杰 冯峥 何伟伟 谭理 LI Chuan-xi;LEI Zhi-jie;FENG Zheng;HE Wei-wei;TAN Li(Key Laboratory of Bridge Engineering Safety Control by Ministry of Education in China,Changsha University of Science&Technology,Changsha 410114,China;Hunan Key Laboratory of Bridge and Building Green Construction and Maintenance,Changsha University of Science&Technology,Changsha 410114,China)

机构地区：[1]长沙理工大学桥梁工程安全控制教育部重点实验室,湖南长沙410004 [2]长沙理工大学桥梁与建筑绿色建造和维护湖南省重点实验室,湖南长沙410004

出　　处：《交通科学与工程》2021年第1期26-33,共8页Journal of Transport Science and Engineering

基　　金：国家自然科学基金资助项目(51778069,51808055);长沙理工大学学术学位研究生科研创新项目(CX2020SS23)。

摘　　要：为提高密配筋STC−钢组合桥面板的经济性及施工的便捷性,研究了STC层钢筋间距对STC−钢组合桥面板弯拉静力性能的影响,提出轻量化STC−钢组合桥面板。以佛山某大桥为工程背景,设计制作了一片含两段不同配筋率的STC−钢组合桥面板条带模型。通过静力破坏试验,研究了组合桥面结构在负弯矩作用下STC铺装层的受力性能。研究结果表明:钢筋直径为10 mm,间距为80 mm的轻量化STC−钢组合桥面板,STC层的名义弯拉开裂强度达到24.66 MPa,满足实际工程设计荷载作用下的强度要求;组合桥面STC层的名义弯拉强度随着截面配筋率增大而提高,当截面配筋率提高1倍时,弯拉开裂强度可提高47.11%~50.61%;根据荷载−挠度曲线,轻量化STC−钢组合桥面板的受力过程可分为线弹性阶段、裂纹发展阶段、屈服阶段和破坏阶段;不同配筋率的STC层对正交异性钢桥面板刚度补强效果一致,在达到极限承载力之前,组合桥面板中两侧刚度相差不大,在满足实际工程需求的同时适当增大STC层钢筋间距,可方便施工、降低造价成本。To improve the economics and construction convenience of the densely-reinforced STC-steel composite bridge deck,the effect of the STC layer steel bar spacing on the bending and tensile static performance of the STC-steel composite bridge deck was studied,and the lightweight STC-Steel composite bridge deck was presented.Taking a bridge in Foshan as the engineering background,a STC-steel composite deck strip model with two different reinforcement ratios was designed and produced.Through static failure test,the STC paving of the composite bridge deck structure under the action of negative bending moment was investigated.The result show that the nominal bending tensile cracking strength of the STC layer of the lightweight STC-steel composite bridge deck with a steel bar diameter of 10 mm and a spacing of 80mm reaches 24.66 MPa,which satisfies the actual engineering design load strength requirements.The nominal bending strength of the STC layer of the combined bridge deck increases with the increase of the section reinforcement ratio.When the section reinforcement ratio is doubled,the bending tensile strength can be increased by 41.11%~50.61%.According to the load-deflection curve,the stress process of lightweight STC-steel composite bridge deck can be divided into linear elastic stage,crack development stage,yield stage and failure stage.STC layers with different reinforcement ratios have the same effect on stiffness reinforcement of orthotropic steel bridge deck.Before the ultimate bearing capacity is reached,the rigidity of the two sides of the combined bridge deck is not much different.While meeting the actual engineering needs,the distance between the steel bars of the STC layer is appropriately increased to facilitate construction and reduce the cost.

关 键 词：正交异性钢桥面结构 配筋率 超高韧性混凝土 弯拉开裂强度 静力破坏试验 

分 类 号：U448.36[建筑科学—桥梁与隧道工程]