木-混凝土组合梁静力试验研究  

Experimental study on wood-concrete composite beams

作　　者：胡夏闽[1] 李巧[1] 彭虹毅[1] 陆伟东[1] 

机构地区：[1]南京工业大学土木工程学院,江苏南京210009

出　　处：《建筑结构学报》2013年第S1期371-376,共6页Journal of Building Structures

基　　金：国家自然科学基金项目(51378255)

摘　　要：为了研究木-混凝土组合梁在静载作用下的受弯性能,进行了4根木-混凝土组合梁的试验,其中1根为完全剪力连接组合梁,3根为部分剪力连接组合梁,考察了木-混凝土组合梁的变形发展过程和破坏形态,得到了组合梁跨中的荷载-挠度曲线、荷载-梁端滑移曲线、组合梁跨中沿截面高度的纵向应变分布和组合梁剪跨区混凝土翼板横向应变分布,并分析了剪力连接度和剪力连接件的布置方式等因素对组合梁受弯承载力以及刚度的影响。试验结果表明:随着剪力连接度的降低,组合梁的变形和界面相对滑移增大,而弹性受弯承载力和极限受弯承载力则随之减小,但并不与剪力连接度成正比关系。连接件并排布置的组合梁与连接件错位布置的组合梁的试验比较表明,只要连接件间距大于其直径的4倍,连接件的布置方式对木-混凝土组合梁的受力性能影响不大。In order to investigate the bending behavior of wood-concrete composite beams under static load,four woodconcrete composite beams were tested,one with full shear connection,three with partial shear connection.The deformation and failure pattern of the composite beams were observed.The force-deflection curve of mid-span,loadslip curve at the end of specimens,longitudinal strain distribution along the depth of the composite section at midspan,transverse strain distribution of concrete flange in composite beams were obtained.Flexural capacity and rigidity of composite beams were studied with consideration of the factors of shear connection type and arrangement of shear connectors.Observation from the experiments indicates that slip at the end of specimens increases with the decrease of shear connection degree,while both elastic and ultimate flexural capacity decrease,but the reduction of bearing capacity is not in direct proportion with the degree of weakening of the shear connection.The experimental comparison of wood-concrete composite beam with shear connectors arranged next to each other and that with staggered shear connectors shows that the arrangement of shear connectors has little effect on behavior of wood-concrete composite beams,as long as the distance between shear connectors is larger than 4 times of its diameter.

关 键 词：木-混凝土组合梁 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]