混凝土自锚式悬索桥施工过程中的收缩徐变效应分析及调整  

Shrink and Creep Effects in Construction Stage of Concrete Self-anchored Suspension Bridge and Adjustment Measures

作　　者：乔朋[1] 狄谨[2] 

机构地区：[1]长安大学建筑工程学院,西安市710061 [2]长安大学公路学院,西安市710064

出　　处：《公路》2014年第2期13-17,共5页Highway

摘　　要：混凝土自锚式悬索桥的主梁和桥塔为预应力混凝土或钢筋混凝土结构,在收缩徐变效应的影响下,桥梁结构整体的内力和变形必然发生变化,施工控制过程中必须考虑收缩徐变的影响。结合一座双塔三跨双索面的混凝土自锚式悬索桥,利用非线性有限元模型对施工过程中混凝土收缩徐变对主梁、塔柱、主缆和吊索的内力和线形的影响进行了详细分析,结果表明主梁和塔柱的变形和内力受影响较为显著。根据收缩徐变影响的特点,提出在施工过程中可采取的调整措施,解决收缩徐变效应引起的成桥状态不闭合现象,以保证自锚式悬索桥成桥时达到合理的线形和内力。The main girder and pylon of concrete self-suspension bridges are prestressed or reinforced concrete structures. As the internal force and deformation of the integrated bridge structure are influenced by concrete shrinkage and creep, the effect must be taken into ccnsideration during the bridge construction. Based on one concrete self-anchored suspension bridge with l：wo towers and three spans, the shrink and creep effects on the girder, pylon, main cable and suspenders irL construction stage are analyzed by the nonlinear finite element models. The results show that the effects are more notable to change the inner force and deformation of the main girder and pylon. According to theoretical analysis, it＇s necessary to take some measures to make some proper adjustment to minimize the no-closure effect to the reasonable finished bridge state, which can ensure that the structure deformation and inner force are reasonable and safe in the finished dead state.

关 键 词：混凝土自锚式悬索桥 施工过程 收缩徐变效应 非线性有限元分析 调整方案 

分 类 号：U441.5[建筑科学—桥梁与隧道工程]