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.