拼接式组合扁梁受弯性能分析

本文提出了一种拼接式组合扁梁，对其进行了受弯性能分析．组合扁梁属于内嵌式组合梁，其组成部分较为复杂，传统承载力计算公式偏保守．为便于此类梁的设计，本文在等效应力法的基础上使用等效矩形应力图法，对拼接式组合扁梁的正截面抗弯承载力公式进行推导．使用ABAQUS有限元软件对组合方法公式的准确性进行验证，并与等效应力法公式进行对比，结果表明组合公式得到的数值更为精准．在相同截面高度和用钢量下设计了一个深肋组合扁梁和一个拼接式组合扁梁，并进行了受弯性能对比；同时对不同钢强度和翼缘厚度影响下的拼接式组合扁梁抗弯承载性能进行分析．使用换算截面法对其进行了弹性刚度的计算，并和有限元进行了对比，二者吻合较好，研究结果为拼接式组合扁梁的设计和优化提供了一定参考依据．

Analysis of Flexural Behavior of Spliced Composite Slim Beam

In this paper, a spliced composite slim beam is proposed, and its flexural behavior is analyzed. The composite slim beam is an embedded composite beam, and the traditional formula of bending capacity is conservative. In order to simplify the design of this kind of beam, based on the equivalent stress method, the equivalent rectangular stress block method is used to deduce the formula of the flexural capacity of the normal section of the spliced composite slim beam. Through the establishment of ABAQUS finite element model, the accuracy of the combined method is verified. Compared with the equivalent stress method, the value obtained by the combined formula is more accurate. A composite slim beam with deep deck and a spliced composite slim beam are designed with the same cross-section height and steel cost, and the flexural behaviors of the spliced composite slim beam and composite slim beam with deep decks are compared with each other. The flexural bearing capacity of the spliced composite slim beam is analyzed under the influence of different steel strength and flange thickness. The elastic stiffness of the spliced composite slim beams is calculated by using the transformed section method, and the results are compared with those of finite element model. The results of this study provide references for the design and optimization of spliced composite slim beam.