摘要
基于江西省萍水河特大桥为原型,在定量分析了汽车活载+温度荷载作用下桥面连续处失效机理的基础上,提出了一种钢-混组合梁简支桥面连续处UHPC-NC+剪力钉优化的新型构造.利用ABAQUS有限元软件,建立桥面连续原型与新型构造有限元模型,并将计算结果进行对比分析其抗裂性能.此外进行了UHPC层厚度的参数分析,进一步探究桥面连续处UHPC层厚度的合理取值范围.通过有限元计算及实桥试验结果表明:钢-混组合梁简支桥面连续新型构造能够明显提高负弯矩区的开裂性能,建议在设计活载作用下,负弯矩区UHPC纵向铺设长度为简支梁跨径的5%,UHPC层厚度的合理范围为桥面板截面的20%~56.3%.
Based on the prototype of Pingshuihe Bridge in Jiangxi Province,the failure mechanism of bridge deck continuity under the action of vehicle live load and temperature load was quantitatively analyzed,and a new structure of UHPC-NC+shear studs optimization for simply supported bridge deck continuity of steel-concrete composite beams was proposed.Using ABAQUS finite element software,the continuous prototype and new structural finite element model of bridge deck were established,and the calculation results were compared and analyzed for their crack resistance.Based on the parameter analysis of UHPC layer thickness,the reasonable range of UHPC layer thickness at the continuous part of bridge deck was explored.The results of finite element calculation and real bridge test show that the continuous new structure of steel-concrete composite beam simply supported bridge deck can obviously improve the cracking performance in negative moment area.It is suggested that the longitudinal laying length of UHPC in negative moment area is 5%of the span of simply supported beam under the design live load,and the reasonable range of UHPC layer thickness is 20%~56.3%of the cross section of bridge deck.
作者
胡志坚
于媛媛
HU Zhijian;YU Yuanyuan(School of Transportation and Logistics Engineering,Wuhan University of Technology,Wuhan 430063,China)
出处
《武汉理工大学学报（交通科学与工程版）》
2023年第6期1159-1165,1172,共8页
Journal of Wuhan University of Technology（Transportation Science & Engineering）
关键词
钢-混组合梁桥
破坏机理
新型构造
抗裂性能
工程应用
steel-concrete composite simply supported bridge
failure mechanism
new structure
crack resistance
the engineering application
