考虑内力重分布的连续FRP-混凝土组合板受力性能分析

Analysis of Mechanical Performance of Continuous FRP-concrete Composite Slabs Considering Internal Force Redistribution

FRP-混凝土组合板是一种新型组合板,由于FRP的线弹性特性,作为连续结构与混凝土连续梁的受力显著不同。为研究连续组合梁的力学性能,基于共轭梁法,文章提出了考虑内力重分布的受力分析方法。对于每种工况,使用对应的单个受力分析方程即可分析组合板受力全过程外荷载与组合板弯矩的关系,计算简便。此外,给出了双跨跨中对称集中加载和满布均布荷载两种常见工况下的组合板受力分析方程,并与相关试验结果进行了比较。结果表明,计算值与试验值吻合较好,提出的方法能够有效地对组合板进行受力分析。

FRP-concrete composite slab is a new type of composite slab.Due to the linear elastic properties of FRP,the stress acting on it as a continuous structure is significantly different from that of concrete continuous beams.To study the mechanical properties of continuous composite beams,based on the conjugate beam method,this paper proposes a stress analysis method that considers the redistribution of internal forces.For each working condition,the relationship between the external load and the bending moment of the composite plate during the entire process of loading can be analyzed using the corresponding single force analysis equation,which is easy to calculate.In addition,the stress analysis equations of the composite plate under two common conditions of symmetrical concentrated loading and fully distributed uniform load in the middle of the double span were given,and compared with the relevant experimental results.The results show that the calculated values are in good agreement with the experimental values,and the proposed method can effectively analyze the stress of the composite plate.