钢筋桁架纤维水泥叠合板受弯性能试验研究

Experimental study on flexural performance of reinforced truss fiber cement composite slabs

为研究新型钢筋桁架纤维水泥叠合板的受弯性能,对3块不同参数的叠合板试件进行静力加载试验,研究了施工阶段叠合板骨架体系的受力及变形特征,分析了使用阶段不同配筋形式试件的破坏形态、荷载-应变关系、承载力以及挠度变化。试验结果表明,施工阶段叠合板骨架自身刚度良好,可免设或少设临时支撑;使用阶段横向分布筋能够约束混凝土裂缝发展及叠合面粘结滑移,使纤维水泥板和混凝土板共同受力,提高了构件开裂、屈服及极限荷载;纤维水泥板在各阶段能有效承担和传递荷载,提高楼板整体刚度和承载能力;拼缝截面作为钢筋屈曲和混凝土最先开裂的薄弱处,应设置附加钢筋等构造措施。

In order to study the flexural performance of the new reinforced truss fiber cement composite slab, three composite slab specimens with different parameters were subjected to static loading tests, the mechanical and deformation characteristics of the composite slab frame system were investigated during the construction stage, and the failure pattern, load-strain relationship, bearing capacity and deflection changes of specimens with different reinforcement types were analyzed during the service stage. The test results show that the rigidity of the truss slab frame itself is good during the construction stage, and temporary supports can be omitted or lessened. The transverse distribution of reinforcement during the service stage can restrain the development of concrete cracks and the bonding and slippage of the stacked surface, which makes the fiber cement board and the concrete plate jointly stressed and improves the cracking, yielding and ultimate load of the component. The fiber cement board can effectively bear and transmit the load in each phase and improve the overall rigidity and bearing capacity of the slab. The joint section is a weak point where the reinforcement buckles and the concrete first cracks and it should be reinforced with additional reinforcement and other structural measures.