Finite element analysis of flexural performance of reinforced truss hollow composite concrete slabs
Abstract
Combining the advantages of cast-in-place hollow slabs and prefabricated reinforced truss composite concrete slabs, a novel hollow composite slab is proposed, characterized by the inclusion of hollow thin-walled boxes without reinforcement at the edges, referred to as the hollow composite slab. To further investigate the flexural performance and critical design parameters of the hollow composite slab, numerical simulations were conducted using the finite element software ABAQUS. Based on the actual specimen fabrication and test results, the rationality of the finite element modeling was validated. Using the finite element model, a parametric analysis of key parameters for the specimens was conducted. The results showed that the finite element model could effectively simulate the crack distribution, flexural performance, and deformation characteristics of hollow composite slabs. The influence of concrete strength and the longitudinal dimension of hollow thin-walled boxes on the flexural performance of hollow composite slabs was minimal, with ultimate bearing capacities changing by only 4.63% and 0.91%, respectively. In contrast, changes in slab thickness and span had a significant impact on the flexural performance, with ultimate bearing capacities changing by 20.46% and 42.09%, respectively. The bearing capacity of hollow composite slabs increased significantly with increasing slab thickness but decreased markedly with increasing span.
Introduction
Prefabricated construction represents a pivotal measure for the building industry to implement national requirements for green, environmentally friendly, and low-carbon development. It is also a major transformation in construction methods in China, aligning with the principles of green building development and holding great significance for achieving the goals of “carbon peaking and carbon neutrality". Concrete composite slabs, as prefabricated structural elements composed of precast concrete base slabs and cast-in-place concrete, are an essential component of prefabricated buildings. However, the traditional concrete composite slabs have limitations, such as a small span and the presence of extended reinforcement at slab edges (commonly referred to as “anchor bars”), which reduce construction efficiency, increase procedures, and elevate production and material costs. These issues contradict the core concepts of prefabricated design. Additionally, traditional designs fall short of meeting higher demands for building environments, functionality, and quality. Modern housing layouts are trending toward simplified arrangements of columns and beams, featuring larger column grids and fewer beams, to facilitate flexible spatial division while ensuring thermal insulation and soundproofing functions.
No comments:
Post a Comment