CCFST柱-预应力混凝土环梁节点抗剪承载力计算分析

Calculation and analysis of shear capacity of CCFST column-prestressed concrete beam joints connected with ring beam

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。

Circular concrete-filled steel tubular( CCFST) column-prestressed concrete ring beam joint is a new form of node,which combines the advantages of high bearing capacity of steel structure and the large span of prestressed concrete structure,and it can be applied to large stadiums and super high-rise buildings. But at the moment,scholars at home and abroad have little research on the mechanical properties of the new type of joints,based on the comparison of the experimental study and finite element analysis,finite element analyses were conducted to simulate the whole process of the shear behavior of the joints by the software,it mainly study the effect of prestress on shear bearing capacity of the joints,the shear bearing capacity formula of CCFST column-prestressed concrete ring beam joint was put forward. The study results show that,with the increase of the prestress within the 0. 75 times of its ultimate tensile strength,the shear capacity of the joints increased by about 14%. The calculated values of the formula for the shear capacity of the joints are in good agreement with the finite element analysis results.