薄壁型钢—竹胶板组合楼板抗弯性能研究

为了推进建筑楼板的轻型化,提出在两张竹胶板之间粘结两根薄壁C型钢,并用竹板条封边形成一种新型钢竹组合楼板,并进行3种组合楼板的试验研究及理论分析。①钢竹界面仅用粘合剂粘结的单纯胶结型;②钢竹界面用粘合剂粘结并钉入紧固件的复合胶结型;③钢竹界面采取粘合剂与紧固件并用,且在型钢两侧粘贴竹板条的型钢强化型。试验结果表明：螺钉紧固件有效地抑制界面连续的大面积脱胶,钢竹组合效应有所改善;型钢强化型组合板整体工作性能优良,能够提供较高的刚度和很高的承载力;新型组合楼板的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是理想的整体弹性变形试验结果,提出组合楼板抗弯刚度的计算方法;根据破坏阶段型钢的应力状态提出组合楼板极限抗弯承载力极限计算方法,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。

Study on Flexural Performance of Thin walled Steel-Bamboo Plywood Composite Slabs

In order to promote the use of lightweight floor in building,a new kind of composite slab was introduced in this paper.This composite slab consisted of thin-walled C steel and bamboo plywood,which were stuck together by structural glue,and the experimental and theoretical studies on three types of composite slab were carried out： ①non-reinforced composite slab which simply stuck bamboo plywood and thin-walled C steel only with adhesive;②fastener-reinforced composite slab which stuck bamboo plywood and thin-walled C steel with adhesive and fastening pieces;③C steel-reinforced composite slab which not only stuck the components with adhesive and fastening pieces,but also added bamboo plywood lath on their left and right sides.Test results showed that the screw fasteners could effectively inhibit large-area interface degumming,which improved the composite effect of thin-walled C steel and bamboo plywood.The C steel-reinforced composite slab had wonderful working performance as a whole,including superior bearing capacity and stiffness.Therefore,the new composite slab could meet the requirements of building floor.According to the experimental results that composite slabs displayed ideal elastic performance in their regular working stage,the calculation method for the bending rigidity of composite slabs was proposed in this paper.Meanwhile,the calculation method for ultimate bending bearing capacity of composite slabs was proposed according to the stress condition of thin-walled C steel in failure stage.The calculated values of midspan deflection and flexural capacity of slabs were relatively well in accordance with experimental results.