双层波纹钢混凝土组合拱静力性能研究

Study on static behavior of corrugated steel-concrete-corrugated steel arch

为提高传统波纹钢拱的刚度和承载力,提出了一种双层波纹钢混凝土(SCS)组合拱结构,其主要包括内外两层波纹钢板以及核心混凝土。为了研究SCS组合拱的静力性能,开展了1个SCS拱跨中加载试验,获得了其承载力以及破坏模式。相较于波纹钢-钢筋混凝土拱和钢筋混凝土拱,在相同的钢与混凝土用量下,SCS拱的承载力更高,这是由于波纹钢有助于增大截面惯性矩以及截面抗剪强度。基于试验结果,建立并验证了有限元模型,分析了混凝土厚度和强度、波纹钢厚度和强度、连接键对受力性能的影响。有限元分析结果显示混凝土厚度与强度、波纹钢厚度与强度的提高均能提高SCS拱的承载力;连接键设置不足将导致波纹钢与混凝土的界面破坏,严重削弱SCS拱的刚度以及承载力。

In order to improve the stiffness and load-bearing capacity of traditional corrugated steel arches,a novel type of structure named corrugated steel-concrete-corrugated steel(SCS)arch was proposed,where concrete lays in the two corrugated steel(CS)arches.In this study,the static performance of one SCS arch was experimentally investigated under mid-span loading.The static strength and failure mode of SCS arch were obtained,and were compared with those of the other two types,namely corrugated steel-reinforced concrete arch and reinforced concrete arch.The results show that the ultimate bearing capacity of the SCS arch is higher than that of the other two types for the same steel and concrete,owing to the positive effect of the CS on the moment of inertia and shear resistance.Based on the experimental results,the finite element model was built and verified.Furthermore,the influences of concrete thickness and strength,corrugated steel thickness and strength,connectors on the mechanical properties were analyzed.The finite element analysis results show that the increase of concrete thickness and strength,corrugated steel thickness and strength can improve the ultimate bearing capacity of the SCS arch.Setting inadequate connectors will cause interfacial failure between the CS and concrete,severely reducing the stiffness and ultimate bearing capacity of the SCS arch.