钢-活性粉末混凝土简支组合梁正截面破坏模式

Normal section failure mode of simple-supported steel-reactive powder concrete composite beams

针对钢-普通混凝土组合梁由于混凝土材料缺陷所导致的一些局限性,将RPC引入到组合梁领域,形成钢-活性粉末混凝土组合梁。采用对比分析,采用ANSYS软件对钢-普通混凝土简支组合梁进行分析,将计算结果与试验结果进行比较,对有限元模型进行验证,然后在其他参数不变的条件下,将混凝土板更换为RPC板,用ANSYS对钢-RPC组合梁进行全过程非线性分析,并对RPC板厚、钢梁屈服强度和钢梁截面尺寸进行参数分析。定义了正弯矩作用下钢-RPC组合梁正截面破坏的弹性模式和塑性模式,研究了不同参数下2种计算模式的差别,认为正弯矩作用下钢-RPC组合梁的正截面抗弯承载力仍然可以按照简单塑性理论进行计算。

Reactive powder concrete （RPC） was introduced into the field of composite beams from the aspect of enhancing material behavior, forming the steel - RPC composite beams （RPCCB）. Following the ways of comparative analysis, the analyses of steel- normal concrete composite beams（NCCB） through ANSYS were carried out, and the results were compared with the test results. The concrete slab was replaced to RPC slab with other parameters that are not changed, and the non - linear analyses of RPCCB were conducted. In addition, parametric analysis of the thickness of RPC slab, yield strength and sectional dimension of steel beams were also analyzed. The elastic and plastic failure modes were defined for the RPCCB, and the difference between the two modes were studied. The results show that the bearing capacity of the RPCCB is higher than that of NCCBs obviously, and the simple plastic theory can still be used for RPCCB.