Research on Bending Performance of Concrete Sandwich Laminated Floor Slabs with Integrated Thermal and Sound Insulation

Abstract

In this study, a full-scale test on the bending performance of concrete sandwich laminated floor slabs with integrated thermal and sound insulation was carried out, and the effects of different reinforcement ratios on the bending performance of concrete sandwich laminated floor slabs were investigated as well as the variation law of the failure modes, characteristic loads, load-mid span deflection, load-rebar strain curves, and anti-slip performance. The results indicate that the concrete sandwich laminated floor slabs present typical bending failure characteristics. According to bending failure characteristics, the damage process can be divided into three stages, i.e., elasticity, cracking, and failure. The bearing capacity significantly increases with the increase in reinforcement ratio. The normal service, yield, and ultimate loads of bearing capacity of the floor slabs with a larger reinforcement ratio increase by 54.55%, 52.94%, and 46.46%, respectively. Moreover, the mid-span deflection decreases significantly with the increase in reinforcement ratio, and the cracking expansion is also delayed. Before cracking, the prefabricated layer and laminated layer can realize load bearing together, and the floor slab is in a state of complete interaction. When the floor slabs reach the ultimate state, the superimposed surface produces a sliding effect, and the floor slab is in a state of partial interaction. The finite element analysis software ABAQUS (with the version number of ABAQUS 2020, the chief creator of David Hibbitt, and the sourced location of the United States) was used to perform nonlinear numerical simulation. The test results accord well with the simulation results, which verifies the correctness of the finite element model. Based on finite element simulation, the influence of post-cast concrete strength on the ultimate load can be ignored.

Experimental investigation on flexural behavior of prefabricated sandwich insulation wall panels with textile reinforced engineered cementitious composites as the wythes after freeze-thaw cycles

“…Choi et al (2016) and Huang and Dai (2020) proposed two main methods to calculate the composite degree of sandwich panel at different stress stages, that is, the composite degree of stiffness before cracking and the composite degree of the bearing capacity after cracking. Based on the experimental investigation, Liu et al (2022) proposed the formulas for calculating the cracking load and ultimate load of the sandwich panel composed of reinforcement, concrete and phenolic foam board. Based on the parallel axis theorem and sandwich beam theory, Balıkoğlu and Demircioğlu (2022) derived the formulas for calculating the equivalent and effective bending stiffness of the composite sandwich beams with grid-scored foam.…”