脱粘对桁架式钢管混凝土拱肋刚度影响研究  

Effect of Debonding on Stiffness of Trussed Concrete-filled Steel Tubular Arch Rib

作　　者：涂光亚[1] 颜东煌[1] 邵旭东[2] 易壮鹏[1] 

机构地区：[1]长沙理工大学土木与建筑学院,湖南长沙410114 [2]湖南大学土木工程学院,湖南长沙410082

出　　处：《公路交通科技》2011年第2期93-96,110,共5页Journal of Highway and Transportation Research and Development

基　　金：湖南省教育厅科研项目(08C109);长沙理工大学土木与建筑学院重点学科基金资助项目(10QSSK07)

摘　　要：定量分析了钢管与核心混凝土之间的脱粘对桁架式钢管混凝土拱桥整体刚度的影响程度。基于完全脱粘计算模型,以一桁架式钢管混凝土悬臂梁为例,揭示了脱粘使桁架式钢管混凝土拱肋抗弯刚度降低的机理。采用有限元方法,以一桁架式钢管混凝土拱肋为例,分析了在完全脱粘情况下矢跨比、桁高、钢管壁厚和荷载作用方式对桁架式钢管混凝土拱肋刚度的影响规律。分析结果表明:在全跨均布荷载作用下,脱粘使得钢管混凝土桁式拱肋刚度降低最大约10%左右,在集中力或半跨均布荷载作用下,脱粘使得钢管混凝土桁式拱肋刚度降低最大会达到50%以上。The effect of debonding between steel tube and centre concrete on the stiffness of trussed CFST arch bridge were analyzed quantitatively.Based on the calculation model of complete debonding,taken a trussed CFST cantilever beam for example,the mechanism of decreasing of bending stiffness of trussed CFST arch rib due to debonding was revealed.By using finite element method,taken a trussed CFST arch rib for example,the effect rule of rise-span ratio,height of truss,thickness of steel pipe wall,and action mode of load on the stiffness of trussed CFST arch rib under the condition of complete debonding were analyzed.The research results indicate that（1） debonding decreased the stiffness of trussed CFST arch rib about 10% at most under the uniformly full-span distributed load,while debonding decreased the stiffness of trussed CFST arch rib above 50% at most under the concentrated force or uniformly half-span distributed load.

关 键 词：桥梁工程 脱粘 有限元法 刚度 桁架式 钢管混凝土拱肋 

分 类 号：U448.22[建筑科学—桥梁与隧道工程] U448.38[交通运输工程—道路与铁道工程]