| With the proposal of China’s "dual carbon" goals and the demand for modernization in the construction industry,promoting the development of prefabricated components has become an inevitable trend.As a major vertical load-bearing element,shear walls are widely used in large-volume residences and high-rise buildings with strict lateral resistance requirements due to their good seismic behavior,high horizontal load-bearing capacity and flexible structural arrangement.Therefore,the prefabrication of shear walls is crucial to increasing the assembly ratio of buildings.However,the currently used prefabricated shear walls mostly suffer from complicated construction,high cost,and connection quality problems,which limit their practical application in engineering.In order to solve the above problems,A novel pre-inserted prefabricated reinforced concrete shear wall is developed,which has advantages of convenient construction,reliable connection and grout-free.Full-scale seismic behavior tests and numerical analysis were conducted to inverstigate the seismic behavior of preinserted prefabricated reinforced concrete shear wall,the main research work can be summarized as follows:(1)Through the review of relevant codes,tests,theoretical research and investigation of engineering cases for shear walls,6 pieces of precast shear wall specimens and 2 pieces of cast-in-place shear wall specimens were designed and fabricated to study the effects of axial ratio and aspect ratio on the seismic behavior of precast shear wall.(2)Low reversed cyclic loading tests were conducted on pre-inserted prefabricated reinforced concrete shear wall specimens with different axial ratios,and the test results were compared with cast-in-place shear wall specimens.The seismic behavior in terms of the crack development and distribution,hysteresis characteristics,skeleton curves,ductility,stiffness degradation and energy dissipation capacity of prefabricated specimens and cast-in-place specimens is investigated and the influence of axial ratios on prefabricated specimens is studied.(3)Low reversed cyclic loading tests were conducted on pre-inserted prefabricated reinforced concrete shear wall specimens with two different aspect ratios to study the influence of aspect ratios on the seismic behavior of precast shear walls,such as crack development and distribution,hysteresis characteristics,skeleton curves,ductility,stiffness degradation and energy dissipation capacity.(4)The numerical models of cast-in-place shear walls and pre-inserted prefabricated reinforced concrete shear walls are developed to simulate the hysteresis curves by using the finite element software DIANA,and the accuracy of the numerical models are validated.Based on the verified numerical models,the effects of axial ratio,aspect ratio and longitudinal reinforcement rate of embedded column on the load-bearing performance of pre-inserted prefabricated reinforced concrete shear wall are analyzed. |
