钢—混凝土组合梁的等效截面

Static properties comparison of steel-concrete composite beams being equivalent as stiffness

基于材料的弹塑性本构关系,提出了以保证截面抗弯刚度相等为原则的截面换算方法,将钢—混凝土组合梁等效成工字型钢梁。采用结构计算软件ETABS研究等效后钢梁的静力特性,并与GB 50017-2003《钢结构设计规范》给出的将截面上翼缘宽度按照材料模量比等效的截面换算方法进行了比较,发现在均布荷载和集中荷载作用下,用本文提供的换算方法等效出的钢梁截面,较之钢结构规范,能够更为精确地模拟组合梁的真实静力特性。因此,用这种方法等效后的组合梁截面,能够更为有效地用于组合框架和新型结构体系的研究分析。

This paper come up with the method of transforming sections essuring the flexural rigidity remain unchanged and transform the steel-concrete composite beam into I-shaped steel beam. The principle is based on elastic-plastic constitutive relation of the materials. Using the structure calculation program ETABS to study the static behaviors of the equivalent steel beam, and compare it with the Steel Structure Design Codes recommend method that transform the top flange width according to the elastic modulus ratio. When acted by the uniform and concentrated force, the steel section transformed by the mathod introduce in this paper, compare with the other one,imitate the static property exactly. For this reason, it can be more appropriate for analysis of composite frame and new type of structure system.