钢管初应力对钢管混凝土单圆管拱极限承载力影响的研究  

Research on the Influence of Tubular Initial Stress to Ultimate Bearing Capacity of Concrete-Filled Steel Tube(Single Tube) Arch Rib

作　　者：周海龙[1] 周水兴[2] 

机构地区：[1]内蒙古农业大学水利与土木建筑工程学院,内蒙古呼和浩特010018 [2]重庆交通大学土木建筑学院,重庆400074

出　　处：《公路工程》2013年第5期72-74,98,共4页Highway Engineering

基　　金：交通部西部交通建设科技项目(20033188142024);重庆市教委资助(KJ050407);内蒙古农业大学博士基金项目(BJ06-54)

摘　　要：钢管混凝土这种组合材料以其自身的优势,推动了钢管混凝土拱桥的大发展;对于大跨度拱桥而言,由此带来不可避免的初应力问题。利用数值分析的方法,建立了实体-梁单元法,选择了核心混凝土与钢管的本构关系,推导了弹塑性切线刚度矩阵,在此基础上利用Visual Fortran语言编写了极限承载力的计算程序,通过引入初应力系数的概念,探讨了不同初应力系数对极限承载力的影响,给出了单拱肋拱桥初应力的限值,对研究钢管初应力对钢管混凝土拱桥极限承载力影响具有一定的指导意义。This composite material Concrete-Filled Steel Tube promotes the development of CFST arch bridges with its self advantage; yet unavoidable initial stress problem comes especially to long-span arch bridge.This paper built solid-beam method by numerical analysis mean,selected the constitutive model both core concrete and steel tube,deducted the elastic and plastic tangential stiffness matrix,and drawn up calculating program for ultimate bearing capacity using Visual Fortran language,through drawing into initial stress coefficient to explore different initial stress coefficient toward to the influence of ultimate bearing capacity.The result makes important guiding significance for research on the Influence of tubular initial stress to ultimate bearing capacity of concrete filled steel tubular arch bridge.

关 键 词：钢管初应力 钢管混凝土 极限承载力 研究 

分 类 号：U448.22[建筑科学—桥梁与隧道工程]