Experimental Study on an Innovative Hollow Concrete Floor System Assembled with Precast Panels and Self‐Thermal‐Insulation Infills

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.

Experimental and Numerical Study on Flexural Behavior of a Full-Scale Assembled Integral Two-Way Multi-Ribbed Composite Floor System

“…The distribution of concrete damage was in an "X" shape, which was basically consistent To further compare the crack distribution, a parameter "DAMAGET" was selected to represent the degree of tensile damage of the assembled integral two-way multi-ribbed composite floor system in ABAQUS. The calculation method of DAMAGET at a specific strain ε 1 is explained as Equation ( 4) [20], where E 0 represents the original undamaged Young's modulus of concrete, f(ε) is the stress function of a specific node and ε 1 0 f (ε)dε stands for the strain energy at the given stress. The range of DAMAGET is within [0,1], indicating the extent of damage of materials.…”

“…Through the design and construction of a real-life project, the feasibility of this new floor system was verified. Other kinds of assembled or assembled integral in floor systems, such as PK prestressed composite slab floor system [15], the assembled monolithic hollow-ribbed floor [16], prefabricated PC floor system [17], and other new systems [18][19][20][21][22] were all investigated through experimental and theoretical methods. Though the assembled techniques could greatly shorten the construction time and enhance the construction efficiency, there is still an urging worry about its stiffness and anti-crack properties under designed load.…”