Experimental Research And Finite Element Analysis Of Fiber Reinforced Gypsum Panel With Reinforcement Concrete Core Composite Members

Along with the promotion of policies on wall material innovation and implementation of energy-saving and environmental-friendly buildings in China, modernization of the housing industry has been gradually put on the agenda. One of the tasks under highest priority in engineering would be to accelerate the optimization and upgrade of the traditional building techniques, and to develop new residential structure systems. Fiber-reinforced gypsum panel is a lightweight hollow-section panel made of plasterboard mixed with waterproof glass-fiber, which would work as a gravity-carrying system after the hollow section filled reinforced concrete. In order to promote the use of this type of structural members in our country, the bearing capacity and seismic-resistant behavior of this new type of composite members were investigated through experimental studies and FEM analyses, with research results summarized in this dissertation. The research work mainly covered the following aspects:1. Mechanical properties including compressive strength, tensile strength, modulus of elasticity and poisson's ratio of the fiber-reinforced gypsum panel were tested, and preliminary and exploratory experiments were conducted on the bonding strength between the core concrete and the gypsum panel. The stress-strain curve acquired from the compressive strength test and tensile strength test will be used for the non-linear FEM analysis in the future.2. Through pseudo-static cyclic tests on four groups of fourteen full-scale composite walls with different types, the shear capacity and major failure modes of composite walls with different core formation were studied, and the wall stiffness, ductility and energy-dissipation capacity were investigated. It turned out that the, fiber-reinforced gypsum panel and core concrete work together to resist the external load, and the composite wall has good load-carrying capacity, stiffness, energy dissipating capacity and ductility. The four-line skeleton curve is also acquired which could be used for analyzing and determining the seismic-resistant capacity of the wall in the future.3. The experimental results have been compared with analytical results using the FEA program ADINA. The FEA model of each type of concrete-filled composite walls were built, and then validated by comparing the analytical results with experimental results. Parametric studies were conducted on this basis, which would investigate the effects of concrete core formation, rebar lay-out, shear-span ratio and concrete strength on the load-carrying capacity of the composite walls.4. A new type of composite floor slabs made of fiber-reinforced gypsum panel and reinforced concrete was proposed in this dissertation. The overall performance of the composite floor slabs was obtained through full scale static bending tests and nonlinear FEA analyses were carried on the composite floor slabs by ADINA. Furthermore the equation for calculating the cracking capacity and the ultimate capacity of the composite slabs was proposed.5. The performance of the fiber-reinforced gypsum panel with concrete filled in every one or two or three cores under eccentric axial load is studied through experimental research. The compressive capacity and failure modes were discussed along with experimental results from Australia. The test results showed that the failure mode of the composite wall specimens under compression was buckling, and the compressive capacity satisfied the requirements for ordinary middle-rise and high-rise buildings.