波形钢腹板管翼缘组合梁抗弯性能试验研究

为研究波形钢腹板管翼缘组合梁的受弯破坏形态及弯曲受力性能,制作2根试验梁进行纯弯试验,研究波形钢腹板管翼缘组合梁施工阶段(试验梁C1)及使用阶段(试验梁C2)的破坏形态及跨中挠度、界面滑移、纵向应变的发展规律。结果表明:试验梁均发生塑性弯曲破坏,其受弯破坏过程可近似划分为弹性、弹塑性及破坏3个受力阶段;试验中各试验梁均未出现腹板剪切屈曲;试验梁C2的管翼缘与混凝土翼板间未出现界面滑移或破坏,二者协同工作性能良好;受薄板褶皱效应影响,波形钢腹板管翼缘组合梁的截面弯曲变形不再符合常规梁理论"平截面假定",但仍可近似按"拟平截面假定"分析。

Experimental Research on Flexural Behavior of Steel and Concrete Composite Girders with a Rectangular Tubular Up-Flange and a Corrugated Steel Web

To study the failure mode and mechanical behavior due to flexure of tubular flange composite girders with a corrugated steel web,we manufactured two test girders to perform flexural tests.Thereafter,we studied the development laws of failure mode,mid-span deflection,interface slippage and longitudinal strain of the test girders designed for the construction stage(Specimen C1)and the service stage(Specimen C2),respectively.The results show that the plastic bending failure will occur in all the test girders,whose bending failure process can be divided into three loading stages:the elastic stage,the elastic-plastic stage,and the failure stage.Shear buckling of the corrugated web does not emerge during the testing processes.The interface slippage or failure between the concrete slab and the steel girder of the Specimen C2 does not occur,which shows a good cooperation working performance between the steel girder and the concrete slab.Due to a wrinkle effect of thin plate,the flexural deformation of the cross section of the tubular flange composite girder with a corrugated steel web will not conform to the plane section assumption of conventional beam theory,whereas it can be analyzed by an approximate plane section assumption.