Abstract
In this paper, a new composite floor system using cold-formed thin-walled C steel channel embedment and a foam concrete slab is developed. This new type of floor system features lightweight, high fire-resistant, and high anti-corrosion features, and can be used for multi-story buildings, providing a promising new alternative floor system for the construction market. Two four-point bending tests were carried out to investigate the flexural capacity and failure modes of this new type of composite slab. Based on the test results, a nonlinear finite element model was developed using general software package ABAQUS. The model is validated using the test results. Using this model, parametric studies were performed to study the key parameters affecting the structural behavior of this new type of composite floor system. Different parameters such as density of the foam concrete, grade of the cold-formed thin-walled C steel channel embedment, and spacing of the cold-formed thin-walled C steel channel were investigated. Their contributions to the overall moment capacity and their effect on the failure modes of this type of composite slab were discovered. Based on experimental results and FE results, design formulas for ultimate flexural capacity of this new type of composite slabs were also developed which can accurately predict their flexural capacity.
Highlights
Foam concrete is a cellular lightweight concrete with reduced density
The density of foam concrete varies from 400 kg/m3 to 1600 kg/m3, much lighter than normal concrete
Up to now, foamed concrete has been widely used for nonstructural members in buildings, working as a lightweight material for sound barriers, and as filling for composite members [2]
Summary
Foam concrete is a cellular lightweight concrete with reduced density. It is made of cement and fly ash with a compressive strength between 9 and 24 MPa in different densities [1]. Up to now, foamed concrete has been widely used for nonstructural members in buildings, working as a lightweight material for sound barriers, and as filling for composite members [2]. It has been used as filling for masonry due to its good thermal insulation and ability to protect against fires [3]. Sohel et al [6]
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