压型钢板-竹胶板组合楼板的力学性能试验研究

为拓宽竹材的应用范围,实现建筑结构构件材料和形式的多样化,本文在阐述竹材的构造和力学性能以及竹材改性产品的基础上提出了一种新型的组合楼板──将竹胶板与压型钢板用结构胶粘结成为压型钢板-竹胶板组合楼板,并针对这一新型组合楼板进行了试验研究及理论分析。以竹胶板厚度、芯部压型钢板厚度及组合楼板跨度为参数进行了6块组合楼板的力学性能试验。结果表明,压型钢板-竹胶板组合楼板的整体工作性能优良,竹胶板与钢板之间具有很好的组合效应,能够提供较高的承载力和刚度,其力学性能可以满足作为建筑楼板的需要。根据组合楼板在正常使用阶段的变形范围内呈现出理想弹性性能的试验结果,提出了组合楼板抗弯刚度的计算方法;根据破坏阶段的应力状态提出了组合楼板极限受弯承载力计算方法,据此计算的组合楼板跨中挠度及受弯承载力的计算值与试验值吻合较好。

Experimental study on mechanical behavior of profiled steel sheet-bamboo plywood composite slabs

In order to spread application of bamboo and implement the diversification of component materials and forms in building structures,a new kind of bamboo-based composite slabs was put forward based on introduction of the composition and mechanical properties of bamboo and modified bamboo products,which sticks bamboo plywood and profiled steel sheet together into bamboo-steel composite floor slabs by structural adhesive,and a series of experiments and theoretical studies were conducted on the new kind of composite slabs.With thickness of the bamboo plywood,profiled steel in the core and the span of slabs as parameters,mechanical properties were tested on 6 pieces of the composite slabs.The results of experiments indicate that as a whole the service behavior of the bamboo-steel slabs is fine;there is excellent composite effect between bamboo plywood and profiled steel sheet thus providing higher bearing capacity and stiffness;the mechanical properties of the composite slabs meet the requirement of building floor slabs.According to the experimental results,composite slabs demonstrate ideal elastic performance under the regular serviceability stage,and calculation method for the bending rigidity of composite slabs is suggested;based on stress condition in the failure stage,calculation method for the ultimate bending bearing capacity is proposed.The calculated values of the midspan deflection and flexural capacity of slabs chime match well with the experimental ones.