自锚式斜拉-悬索协作体系桥非线性分析  

Nonlinear analysis of self-anchored cable-stayed suspension bridge

作　　者：王会利[1] 秦泗凤[2] 张哲[1] 许福友[1] 

机构地区：[1]大连理工大学桥梁工程研究所,辽宁大连116024 [2]大连大学材料破坏力学数值试验研究中心,辽宁大连116622

出　　处：《大连理工大学学报》2010年第6期953-957,共5页Journal of Dalian University of Technology

基　　金：国家自然科学基金资助项目(50708012);交通部西部交通建设科技项目(200631882350)

摘　　要：阐述自锚式斜拉-悬索协作体系桥几何非线性特征,分析混凝土收缩徐变、主缆矢跨比和主梁拱度对协作体系的影响.应用线性理论、线性二阶理论和非线性理论对一座主跨800m的自锚式斜拉-悬索协作体系桥进行分析,得到主梁、主塔在活载作用下不同矢跨比和主梁拱度下的弯矩和位移.分析表明:主跨800m的自锚式斜拉-悬索协作体系桥可以采用较简单的线性二阶理论进行近似活载计算,其误差不超过6%;混凝土收缩徐变对结构受力影响较大;整体刚度优于悬索桥;主缆、主梁轴力和刚度随着矢跨比的增大而减小;主梁设置拱度可以提高体系整体刚度.Geometrical nonlinearity of self-anchored cable-stayed suspension bridge was studied.The influences of shrinkage and creep of concrete,rise span ratio and girder camber on system were discussed.A self-anchored cable-stayed suspension bridge with main span of 800 mwas analyzed with linear theory,two-order linear theory and nonlinear theory.The moment and displacement of girder,pylon under different rise span ratio and girder camber stages with live load were gotten.According to the results of analyses,the live load of a self-anchored cable-stayed suspension bridge with main span of 800 mcan be analyzed with two-order linear theory and the error is less than 6%.The shrinkage and creep of concrete greatly affect the structure.And the system stiffness is superior to that of suspension bridge.As the rise span ratio becomes larger,the axial force and stiffness of main cable and girder are smaller.The system stiffness increases if main girder camber is set.

关 键 词：自锚式 斜拉-悬索 线性二阶 非线性 

分 类 号：U441.2[建筑科学—桥梁与隧道工程]