Study On Seismic Behavior Of Reinforced Concrete Outer-frame Joint With Non-demolition Templates

Non-demolition template is composed of cement, sand, stone, glass fiber mesh cloth, concrete admixture and water according to a certain process produced. It can be introduced to replace the concrete cover of ordinary concrete beams and columns,bonded to the main concrete and bear the load together. More steel and wood could be saved and the construction efficiency can be improved by using the templates. Under static load, the work performance of the non-demolition template and concrete is reliable. Under seismic action, however, study on the work performance and mechanism of the non-demolition template and concrete is less, especially for the less study on seismic behavior of reinforced concrete joints with non-demolition templates. Based on the quasi-static test to simulate the seismic action, low-cyclic loading tests of reinforced concrete outer-frame joints with non-demolition templates are carried out by controlling load and displacement. Seismic behavior of reinforced concrete outer-frame joint with non-demolition templates is discussed according to the finite element simulation. The influence of axial compression ratio, shear compression ratio and the core zone of the joint stirrup ratio on the ultimate bearing capacity, energy dissipation and ductility are analyzed. The main contents of the thesis are summarized as follows:(1)The existing research on non-demolition template and frame joint has been carried on the arrangement of literature. The mechanical properties of reinforced concrete frame joints and non-demolition template structure are summarized. Based on the existing research, quasi-static analysis of reinforced concrete outer-frame joint with non-demolition templates research by experiment and finite element simulation is carried on, and the factors that affect the seismic behavior are identified.(2)Low-cyclic loading tests on reinforced concrete outer-frame joint with non-demolition template are carried out, the results followed from failure patterns,hysteretic curves, energy dissipation and ductility are discussed in detail.(3)The model of reinforced concrete outer-frame joint with non-demolition templates is established according to the design requirements, and the nonlinear analysis calculation of finite element is carried on. The calculated results contrast to experimental results, the finite element simulate of outer-frame joint with non-demolition templates is verified, and the causes of deviation both comparisons are analyzed.(4)By using the orthogonal design experiment, nine models of reinforced concreteouter-frame with non-demolition templates are established. The impact of different axial compression ratio, shear compression ratio and the core zone of the joint stirrup ratio on seismic behavior are discussed in detail. The key factor and important factor of influence of the joints on bearing capacity, energy dissipation and ductility are found out, also impact trend.