| China is located in the area between two big seismic belts of the world, and China is the world's most used reinforced concrete structure of the states, so reinforced concrete frame structures in China require high seismic performance. With the research and the use of new materials of high strength steel, high strength and high performance concrete, the scope of application of the reinforced concrete structure has been expanding in the construction field. It has theoretical significance and practical significance of research on its seismic performance. Through the study of this kind of structure design for the future and provide a theoretical basis and also can be used to guide engineering practice.Based on the cooperation project of Construction Drawing Review Center in Liaoning province Yingkou City Economic and Technological Development Zone, the project focuses on seismic performance of the beam-column Joints with weakening at the ends of beam by experimental research and finite element analysis. A different dimension parameters of the rigidity regulating elements and reinforced concrete slab specimens embedded rigidity regulating elements are designed and produced, testing them under static loading, focusing on the impact of various factors to the seismic behavior, ductility performance as well as stiffness and strength degradation.This paper mainly introduces the metal elements:Rigidity Adjusting Boxes (RAB), which are designed to weaken the T-shaped beam flange, and reduce the T-shaped beam rigidity on seismic behavior of beam-column Joints with weakening at the ends of beam of steel reinforced concrete frame. The test design situation, loading system and test process, as well as the failure phenomenon are mainly introduced. The test results and conclusions are observed based on the analysis and summary of load-displacement curves and stress concentration of each element. In addition, the finite element analysis for each specimen is performed. Comparing the numerical results with the experiment results, we find they can match well, validating the accuracy and reliability of the finite element analysis.The test results prove that rigidity adjusting box can provide good effect to lower the strength of floor flange and weaken the effect of the stiffness. They can provide sufficient strength and rigidity for the normal use of structure function when the external load is small, ensure the structures'normal working state under the influences of no earthquake and small earthquake. Rigidity adjusting boxes buck before concrete buckling damage, and produce plastic buckling deformation when the load intensity near the concrete strength but not destroyed yet, which can decrease the strength of the T-shaped beam rapidly and reach the purpose of strong column and weak beam. |
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