Study On Seismic Performance Of Semi-rigid Connection Damping Infill Wall With Frame Structures

In the frame structure,the infill wall can can improve the structural rigidity and energy dissipation capacity,and reduce the lateral displacement of the structure.It also makes it difficult to achieve the expected failure mechanism and can easily cause strong beam-weak column,weak layer,short column damage and other related failures.In order to overcome the above problems,this paper proposes a new type of infilled wall technology—semi-rigidly connected to a damping infill wall.And carried out three full-scale test specimens of the low-cycle cyclic loading test and numerical model analysis,the work is as follows:(1)Through the investigation of earthquake damage phenomena,field surveys at the construction site,and literature data,it can be concluded that the rigid jointed infill wall is characterized by "simple construction but severe earthquake damage".The flexible jointed infill wall has "better seismic performance but construction Complex " features.(2)On the basis of summarizing the advantages of rigid connection and flexible connection infill wall,combined with the characteristics of "high energy dissipation capability" of the infilled wall,a method of constructing semi-rigidly connected damping infill wall of frame structure is proposed.The related achievements have been granted 4patents and 1 substantive examination of invention patent.(3)In order to explore the influence of the semi-rigidly connected damping infill wall on the seismic performance of the frame structure,this paper conducts the rigid connection of ordinary infill wall steel frame specimens,semi-rigid connection damping infill wall steel frame specimens,and infill-free steel frame to low-cycle repeated loading tests.the damage characteristics,hysteretic properties,skeleton curves,stiffness degradation,energy dissipation properties,strain of steel frames,strains of strained steel bars,out-of-plane displacements,etc.of the specimens were compared and studied.The results show that: "Semi-rigid connection damping infill wall" construction scheme is feasible,it is possible to achieve the expected mechanism and design goal of “the small earthquakes use the favorable effects of stiffness effects,and large earthquakes reduce the adverse effects of the stiffness effects”.(4)Using finite element software ABAQUS to simulate the seismic performance of framed infill walls with different structural forms,the stress cloud diagram,equivalent plastic strain,etc.of semi-rigidly connected damped infill walls and rigid infilled walls were studied.the test results were verified to provide theoretical support for the design of semi-rigidly connected damping infill walls.