公路连续梁桥设计要点及验算分析  

Design Points and Verification Analysis of Highways Continuous Beam Bridge

作　　者：刘小伟 LIU Xiaowei(Wuhan Engineering Consulting Department Co.,Ltd.,Wuhan,Hubei 430014,China;Huazhong University of Science and Technology,Wuhan,Hubei 430074,China)

机构地区：[1]武汉市工程咨询部有限公司,湖北武汉430014 [2]华中科技大学,湖北武汉430074

出　　处：《黑龙江交通科技》2024年第10期102-106,共5页Communications Science and Technology Heilongjiang

摘　　要：为了提高公路连续梁桥的设计质量,防止其在建设和运营期间出现安全事故,分析了连续梁桥的结构选型原则和桥位布置原则,以安顺至盘州(黔滇界)高速公路的连续梁桥为研究对象,将其分三跨布置,跨径组合为(39+68+39)m,选择了桥梁混凝土和钢筋的物理力学参数,并设计了箱梁的顶板厚度(跨中顶板和悬臂顶板)、底板厚度、腹板厚度等。随后,分析连续梁桥的计算荷载和作用组合,利用有限元软件建立连续梁桥的三维仿真模型,验算了桥梁在承载能力极限状态和正常使用极限状态下的性能,桥梁的抗剪、抗扭、抗弯、抗裂能力满足规范要求,悬臂端的挠度小于悬臂长度的1/300,边跨、中跨的挠度小于计算跨径的1/600,说明连续梁桥的设计方案可行。In order to improve the design quality of continuous beam bridges on highways and prevent safety accidents during construction and operation,the structural selection principles and bridge layout principles of continuous beam bridges were analyzed.Taking the continuous beam bridge on the Anshun-Panzhou(Guizhou-Yunnan border)Expressway as the research object,it was divided into three spans with a span combination of(39+68+39)m.The physical and mechanical parameters of the bridge concrete and steel bars were selected,and designed the top plate thickness(mid span top plate and cantilever top plate),bottom plate thickness,web plate thickness,etc.Subsequently,the calculation load and action combination of the continuous beam bridge were analyzed,and a three-dimensional simulation model of the continuous beam bridge was established using the finite element software.The performance of the bridge under the ultimate bearing capacity and normal use limit state was verified.It was found that the shear,torsion,bending,and crack resistance of the bridge met the code,and the deflection of the cantilever end was less than 1/300 of the cantilever length,and the deflection of the side span and middle span was less than 1/600 of the calculated span,indicating that the design scheme of the continuous beam bridge is feasible.

关 键 词：连续梁桥 设计要点 作用组合 结构验算 

分 类 号：U442[建筑科学—桥梁与隧道工程]