大尺度预应力型钢-混凝土组合梁变形性能参数分析

为研究大尺度预应力型钢-混凝土组合梁变形性能,对已有试验的预应力型钢-混凝土组合梁建立模型,验证建模分析的可靠性。基于分析结果,设计7根大尺度预应力型钢-混凝土组合梁构件,考虑型钢对混凝土区域约束效应的影响,将混凝土划分为"核心"区和"非核心"区,采用不同的本构关系模型,分析其变形性能,探讨型钢含钢量、预应力度、混凝土强度等级等参数的变化对模拟梁变形性能的影响。数值分析结果表明:型钢含钢量和预应力度的增强能够有效地提高构件抗变形性能。提出考虑核心约束效应的预应力型钢-混凝土组合梁新型建模分析方法,为工程实践提供依据的同时,也为大尺度预应力型钢-混凝土组合梁变形设计提供参考。

Parameter analysis of deformation performance about large-scale prestressed steel reinforced concrete beams

In order to study the deformational properties of large-scale prestressed steel reinforced concrete beams,by modeling and analyzing the existing prestressed steel reinforced concrete beams,the reliability of modeling analysis was verified.Based on the analysis results,7 large-scale prestressed steel reinforced concrete beams were designed.Considering the regional constraints,concrete is divided into two parts,core area and non core area,to analyze the deformational properties during stress and discuss the effect of the parameter variables like prestressed degree,steel content of section steels and concrete strength grade etc.On the deformational performance of simulated beams.By analyzing the statistics,it is shown that the reinforcement of steel content of section steels and prestressed degree can effectively improve the anti-deforming capability of components.It is put forward a new kind of modeling and analyzing method to consider the core constrain of prestressed steel reinforced concrete beams.It not only provides basis for engineering practice but also provides a reference for the variant design of the large-scale prestressed steel reinforced concrete beams.