斜交框构桥设计要点的探讨  

Discussion on the Design Essentials of Oblique Frame Bridges

作　　者：柴桂红[1] 

机构地区：[1]铁道第三勘察设计院集团有限公司,天津300142

出　　处：《铁道标准设计》2011年第11期81-84,88,共5页Railway Standard Design

摘　　要：为探讨斜交框构桥在设计过程中应注意的要点,结合具体工点设计,采用MIDAS分析软件建立有限元模型,对框构主体钝角区应力、路桥过渡、基础沉降、框构主体配筋、框体扭转变形及框构主体混凝土裂缝控制因素进行分析,得出斜交框构设计时钝角处应适当增大配筋,与框构相衔接的路基过渡段应设置圬工转正体结构,横向结构尺寸较大框构宜分节,不宜分节者应采取措施控制不均匀沉降及改善结构配筋,控制框构主体扭曲变形,增加构造钢筋来提高框构结构的抗裂性。In order to study the design essentials of oblique frame bridges during the design process,the paper citing a specific project,used MIDAS Civil structure analysis windows system to establish a finite element model to analyze the stresses in the obtuse angle portion of the major structure,transition between subgrade and frame bridge,settlements of the foundation,torsional distortions of the major structure,and the crack control factors of concrete of the major structure.It concluded that the structural reinforcement should be increased in the obtuse angle portion,a concrete block should be designed in the transition section between subgrade and frame bridge to form a monolithic structure,frame bridge with large transverse size should be constructed in segments,if this can not be done,measures must be taken to control the differential settlements of foundations and improve structural reinforcement,torsion distortion of the major structure should be controlled,and the crack resisting property of the frame bridge should be improved by increasing distribution reinforcement.

关 键 词：框构桥 斜交桥 设计要点 

分 类 号：U442.5[建筑科学—桥梁与隧道工程]