Seismic Performance Of The Shale Ceramsite Concrete Frame With The Different Reinforcement Beam

In the last decade, the frequent earthquakes have caused huge losses for the attacked countries. The seismic performance of building is strongly related to its weight and deformation capacity. Therefore, properly selecting the building materials with the light-weight, high-strength and good-deformation abilities is an important approach to improve the seismic performance of building.Ceramsite concrete, due to its light weight, strong strength, thermal insulation, and many other advantages, has a broad application prospect. At present, extensive investigations have been carried out for the material properties and physical characteristic. However, the researches on the structural performance and seismic performance of the concrete structure are very limited, and mainly for local members,While the available references on over-all structures are very few. Fame structure is one of the main types of building structures. Thus, it is significant to investigate the seismic performance of ceramsite concrete frame structure.Shale ceramisite concrete is one of important types of ceramisite concrete. In the present thesis, the seismic performance of shale ceramisite concrete is studied. The content is composed of two aspects.(1) six single-story and single-span shale ceramsite concrete frame(reduced-scale is 1:2) models with different reinforcement ratios in the frame beam are fabricated,and tested with low-cycle horizontal loading under the condition of constant vertical loading. The effect of reinforcement ratio and stirrup on the failure pattern, hysteretic loop, ductility, stiffness and bearing capacities is examined.(2) A suitable trilinear hysteretic restoring force model for shale ceramisite concrete frame structure is proposed on the basis of the classical hysteretic model, P-? hysteretic curves, skeleton curve and stiffness degradation law.Furthermore, a calculative formula of stiffness is established through the regression analysis of test data.The preliminary results reveals several conclusions. First, the collapsing mechanism of the shale ceramisite concrete frame structure belongs to ‘beams plastic hinges failure’ mechanism, the hysteretic curve is plumber, and the deformation ductility factor is more than 3. Thus, the shale ceramsite concrete frame has a better ductility and seismic performance. Second, increasing the longitudinal reinforcement ratio or reducing the spacing of stirrup can enhance the seismic performance and deformability of shale ceramsite concrete frame. Third, the proposed trilinear hysteretic restoring force model is in good agreement with the test data.The results of the thesis can provide some reference for the application of shale ceramiste concrete in engineering.