部分剪力连接预应力组合箱梁受弯性能试验研究  

Experimental study on bending behavior of prestressed composite box girder with partial shear connection

作　　者：胡少伟[1] 叶祥飞[1] 

机构地区：[1]南京水利科学研究院,江苏南京210024

出　　处：《建筑结构学报》2011年第10期153-158,共6页Journal of Building Structures

基　　金：江苏省自然科学基金项目(BK2007010);中央级公益性科研院所重大项目(Y410006)

摘　　要：为研究剪力连接程度对预应力钢与混凝土组合箱梁的界面相对滑移、挠度及受弯承载力的影响,设计制作了4根不同剪力连接程度预应力钢与混凝土组合箱梁模型试件,采用三分点对称加载,对其进行了受弯性能试验研究。研究表明,随着剪力连接程度的降低,变形及界面滑移明显增大,承载能力有所降低,但并不与剪力连接程度成正比关系,连接程度为0.5的组合箱梁承载力较完全连接组合箱梁降低不到30%。结合国内外7根部分剪力连接组合梁试验资料,运用最小二乘法,对欧洲规范EC4中关于部分剪力连接组合梁承载力计算公式进行了修正。结果表明,修正值与实测值吻合良好,满足工程精度要求。To investigate the influence of the shear connection on the bending behavior of composite box beams such as the slip between concrete flange plate and steel beam flange,deformation and bearing capacity,four prestressed steel-concrete composite box beams with different shear connection details were designed and constructed.The test specimens were loaded by three concentrated forces symmetrically and the three loading points equally divide the girder into three segments.The bending behavior of the specimens was studied in details.The research results show that the deformation and interface slip are increased and the bending capacity is reduced with the weakening of the shear connection,but the reduction of bearing capacity is not in direct proportion with the degree of weakening of the shear connection.The bending capacity of two composite box beams with the shear connection of 0.5 was reduced less than 30 percent comparing with the full shear connection.Based on experiment results of seven composite box beams with partial shear connection reported by various researchers from China and other countries,the calculation formula of flexural capacity of composite steel-concrete beams with partial shear connection in Eurocode 4 was modified using the least square method.It turns out that the modified values are in good agreement with experimental results which meet the engineering accuracy.

关 键 词：预应力组合箱梁 部分剪力连接 受弯承载力 界面滑移 挠度 

分 类 号：TU398.9[建筑科学—结构工程] TU317.1