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圆钢管混凝土(CCFST)柱-预应力混凝土环梁节点作为一种全新的节点形式,其充分结合了钢结构承载力大与预应力混凝土结构跨度大的优点,可应用于大型场馆及超高层建筑当中。但目前国内外学者对于该新型节点的受力性能研究尚少,在试验研究与有限元分析对比的前提下,利用有限元软件对该新型节点核心区受剪性能全过程进行分析,主要研究了预应力参数对该节点抗剪承载力的影响,提出了CCFST柱-预应力混凝土环梁节点抗剪承载力的计算公式。研究结果表明:当预应力从0增至0.75fptk时,节点抗剪承载力提高了约14%;节点抗剪承载力公式计算值与有限元分析结果吻合良好。
The CCFST-prestressed concrete ring beam joint is a new node form, which fully combines the advantages of large steel structure bearing capacity and large prestressed concrete structure span, and can be applied to large-scale stadiums and super high-rise buildings. among. However, at present, domestic and foreign scholars have few studies on the mechanical properties of the new node. Under the premise of comparison between experimental research and finite element analysis, the whole process of the shear performance of the core region of the new node is analyzed using finite element software. With the influence of prestress parameters on the shear capacity of the joint, the formula of the shear capacity of the CCFST column-prestressed concrete ring beam joint was proposed. The results show that when the prestress increases from 0 to 0.75 fptk, the shear capacity of joints increases by about 14%; the calculated values of shear capacity formula of joints agree well with the results of finite element analysis.