中文摘要：

组合扁梁将钢梁内嵌于混凝土楼板之中，不仅能够较大程度的降低结构层高，改善钢结构的防火性能，而且能够满足建筑上对大空间的无柱要求，在多层钢结构建筑中有广阔的应用前景。组合扁梁有效宽度的选取将直接影响其承载力和刚度的计算，更是组合扁梁工程应用的设计基础。本文通过建立简支组合扁梁的有限元模型，分析了组合扁梁的跨度、梁间距、翼缘板厚度等因素对组合扁梁有效宽度的影响并对进一步的研究提出了建议。

英文摘要：

The steel-concrete composite slim beams, with the steel beam encased in concrete floor slabs, have ninny advantages, such as low structural height, efficient fire resistance and good serviceability, etc. Therefore, there is a promising application prospect in multi-storey steel buildings for composite slim beam. The effective width of composite beam is the significant precondition for the calculation of loading capacity and stiffness of composite slim beam which are the foundation of the application in projects. In this paper, the influences on the effective width of some important factors such as span, spacing and thickness of flange plate are analyzed by Finite Element Analysis （FEA） and the suggestions for further researches are proposed.