预应力型钢混凝土梁-钢管混凝土柱节点变参数受力分析

Stress Analysis of Joint Variable Parameters of Prestressed Steel Concrete Beam and Concrete Filled Steel Tubular Column

预应力型钢混凝土梁-钢管混凝土柱的可靠性是保证框架结构安全的关键。以呼和浩特东站站房为例,采用ADINA有限元软件建立了节点有限元模型,通过变参数分析,研究了节点区加强环板设置方式、厚度及预应力筋截断位置对节点受力性能的影响。结果表明:同时设置内外加强环板并进行圆弧过渡可有效降低环板的应力集中;预应力筋在2. 5倍型钢梁高以外截断时,预应力筋的截断位置对节点的受力影响不大;在设计荷载作用下节点呈非线性弹性变化,具有很好的承载力和刚度,且梁内箍筋最大应力值出现在梁端加强区以外。

The reliability of prestressed steel reinforced concrete beam and concrete filled steel tubular column joint is the key to ensure the safety of the frame structure. Taking the Hohhot East Railway Station house as an example,this paper establishes the finite element model of the joint with ADINA finite element software and studies the influences of the setting mode,the thickness and the truncation position of the prestressed steel bar on the mechanical performance of the joint based on the variable parameter analysis. The results show that the stress concentration of the annular plate can be reduced effectively with the internal and external reinforced plates set up simultaneously. The truncated position of the prestressed tendon has little influence on the stress of the joint when the prestressed tendon is truncated out of 2. 5 times the steel beam height. And the joint tends to have non-linear elastic change under designed load with excellent bearing capacity and stiffness,and the maximum stress value of the stirrup inside the beam appears outside the reinforcement area of the beam end.