节段接缝薄弱层对大跨悬浇预应力混凝土箱梁变形影响研究  

STUDY OF THE EFFECT OF SEGMENTAL JOINT WEAK LAYERS ON DEFORMATION OF LONG SPAN CANTILEVER-CASTING PC BOX GIRDERS

作　　者：刘杰[1] 叶见曙[2] 陈娟娟[1] 

机构地区：[1]三峡大学土木与建筑学院,湖北宜昌443002 [2]东南大学交通学院,南京210096

出　　处：《工业建筑》2015年第2期70-75,共6页Industrial Construction

基　　金：国家自然科学基金项目(11472160);宜昌市自然基础科学研究与应用专项项目(A14-302-a02);三峡大学科学基金资助项目(KJ20130047)

摘　　要：为分析节段接缝薄弱层对大跨悬浇预应力混凝土箱梁变形的影响,以虎门大桥辅航道桥施工阶段分析有限元模型为基础,建立带节段接缝薄弱层单元的有限元模型。考虑节段接缝薄弱层单元的材料特性、单元长度的影响,运用有限元法对该问题进行分析。结果表明,节段接缝薄弱层的变形对大跨悬浇预应力混凝土箱梁累积位移的影响不可忽略;节段接缝薄弱层的剪切变形很小,对箱梁变形的影响主要由节段接缝薄弱层的弯曲变形引起。同时,提出采用凿毛的施工工艺措施来减小这种影响。In order to analyze the effect of segmental joint weak layers on deformation of long span cantilever-casting PC box girders, FE models with segmental joint weak layer elements were established based on the FE model considering construction processes of the assistant shipping channel bridge of humen bridge.Considering variations in thickness and material properties of segmental joint weak layer elements, the problem was studied with FEA.The results showed that deformation of segmental joint weak layers could lead to significant increment in cumulative deformation of long span cantilever-casting PC box girders; the shearing deformation of segmental joint weak layers was quite small, and this effect was mainly induced by bending deformation of segmental joint weak layers. Meanwhile, construction technology measure of chiselling was proposed to decrease the effect.

关 键 词：预应力混凝土箱梁 节段接缝 薄弱层 凿毛 下挠 

分 类 号：U441[建筑科学—桥梁与隧道工程] U448.35[交通运输工程—道路与铁道工程]