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为了探讨界面滑移效应对钢-竹组合楼板变形的影响,进行了6块组合楼板受弯性能试验,对其破坏形态、承载能力、跨中变形、界面相对滑移进行了研究。试件分为两组,第一组为冷弯薄壁型钢与竹胶板界面仅用结构胶复合,另一组则在胶黏基础上用自攻螺钉强化。基于弹性体变形理论和界面剪力与滑移量成正比的假设,推导出简支钢-竹组合楼板在对称荷载作用下的跨中变形理论计算式。试验和理论分析表明:第一组试件考虑滑移效应的跨中变形计算值与实测值吻合较好,因考虑了跨中附加挠度的影响,理论计算结果与换算截面法相比,其精度大约提高5%,更符合实际情况;第二组由于自攻螺钉的强化作用,整体性能提高,材料进入塑性发展阶段,在纯黏结界面理论计算方法的基础上,引入塑性发展系数,较好地实现了跨中变形理论计算与试验结果的吻合。
In order to investigate the effect of interface slip effect on the deformation of steel-bamboo composite slab, the flexural performance of six composite slabs was tested, and the failure morphology, bearing capacity, mid-span deformation and relative slip of interface were studied. The specimens were divided into two groups. The first group consisted of composite structural steel with cold-formed thin-walled steel and the interface with the bamboo-type plastic. The other group was reinforced with self-tapping screws based on the adhesive. Based on the assumption that the elastic deformation theory and the interfacial shear force are proportional to the slippage, the theoretical calculation formula of midspan deformation of simply supported steel-bamboo composite slab under symmetrical load is deduced. The experimental and theoretical analysis show that the calculated results of the mid-span deformation of the first group of specimens considering the slip effect are in good agreement with the measured values. Because the influence of the additional mid-span deflection is considered, the theoretical calculation results are approximately Increased by 5%, more in line with the actual situation; the second group due to the strengthening effect of self-tapping screws, the overall performance increase, the material into the plastic stage of development, based on pure bonding interface theory calculation method, the introduction of plasticity development coefficient, better The theoretical calculation of the mid-span deformation coincides with the experimental results.