Abstract
This paper presents an innovative hollow concrete floor system comprising hollow precast panels and self-thermal-insulation infills. The precast panels are connected by welded reinforcement bars and cast-in-situ concrete joints. To study the vertical load-carrying capacity and the working mechanism of this innovative floor system, a static loading test was carried out on a 1/2 scale model. The specimen consists of six precast slab members, four precast reinforced concrete beams and columns, respectively. Experimental and simulation results related to the crack development and vertical load-carrying capacity were analyzed. It is found that the innovative floor system could meet the capacity requirements of the Chinese code. Furthermore, the crack development of the innovative system shows similar characteristics with the solid floor. To explore the feasibility of the existed analysis methods, the specimen was simulated and compared by nonlinear analysis in ABAQUS. The comparison illustrates that the analogue cross beam method is more accurate and suitable for the simulation of the innovative hollow concrete floor system.
Highlights
As a reliable construction building material, concrete could meet the requirements of demanding construction conditions, different shaped structural components, and harsh environment for its mature construction technologies and superior properties [1,2,3]
For the analogue cross beam method, the continuous slab is simulated by some scattered beams with the same span. e sizes of the analogue cross beam are calculated with the principles that (1) the transformed beams share the same bending stiffness with the hollow slab and (2) the heights of the slab and beam remain identical; the width can be calculated as follows: I
Where bb is the width of the analogue cross beam, the hollow slab is divided into serval average slab strips, b0 represents the width of the hollow slab strips, I is the moment inertia of
Summary
As a reliable construction building material, concrete could meet the requirements of demanding construction conditions, different shaped structural components, and harsh environment for its mature construction technologies and superior properties [1,2,3]. In the 1960s, Mueller invented the B-Z reinforced concrete cellular plate [8], which is a kind of cast-in-situ concrete hollow slab Experimental research on this new type of floor was carried out by Franz [9] and the results showed that the stiffness of the hollow floor was equivalent to the solid flat slab. When using the analogue slab method, the requirements are that (1) the distance between ribbed beams should be larger than 2 b0, and (2) if the difference of the two-way stiffness of concrete hollow floor can be ignored, it should be calculated as isotropic slab; otherwise, it needs to be calculated as an anisotropic slab. When using the analogue slab method, the requirements are that (1) the distance between ribbed beams should be larger than 2 b0, and (2) if the difference of the two-way stiffness of concrete hollow floor can be ignored, it should be calculated as isotropic slab; otherwise, it needs to be calculated as an anisotropic slab. e modulus of the concrete and infills when calculated as the isotropic slab is calculated through the formulas below:
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