Study On Seismic Performance Of Frame-shear Wall Structure With Embedded Steel Bolt Connection

In recent years,the state has actively promoted the development of prefabricated buildings.However,due to the complex assembly forms,difficult quality control and unfavorable on-site construction,engineering enterprises and projects often adopt prefabricated structures passively due to the requirements of national and local policies on assembly rates.Therefore,how to simplify the connection form of the node to make it convenient for construction and assembly,and ensure that it has good seismic and overall performance is the key.Based on this,on the basis of a large number of scholars’ research,this paper puts forward a kind of embedded steel bolt connection node which is convenient for construction and assembly,and carries out the seismic performance test of prefabricated frame and frame-shear wall connected by grouting sleeve at the end of the beam.On the basis of experimental research,numerical simulation calculation and parameter analysis are carried out,and the seismic performance is studied by analyzing the failure mode,bearing capacity,stiffness,ductility and energy dissipation capacity.The main conclusions and innovations of this paper are as follows :(1)The seismic performance of embedded steel bolted frame is slightly better than that of cast-in-place frame.The hysteresis curves of the two specimens are full,and the energy dissipation capacity is good.The energy dissipation capacity of the prefabricated specimen is better than that of the cast-in-situ specimen.In the process of displacement loading,the hysteresis curve is generally ’bow’.In the later stage of loading,the curve gradually develops to ’anti-S’,and the energy dissipation effect is reduced.The bearing capacity of precast specimens is slightly lower than that of castin-place specimens,but the difference is not more than 5%.The bearing capacity degradation coefficient of precast specimen is higher than that of cast-in-situ specimen,indicating that the cumulative damage of the former is lighter than that of the latter.The stiffness degradation of the two specimens is similar,and the stiffness and ductility of the prefabricated specimens are better than those of the cast-in-place specimens.(2)Seismic performance of frame-shear wall with embedded steel bolt connection is equivalent to that of cast-in-situ frame-shear wall.The hysteretic curve shape of castin-situ frame-shear wall is between ’bow’ and ’anti-S’,while the hysteretic curve of precast frame-shear wall is ’bow’,and the energy dissipation capacity is relatively good.At the later stage of displacement loading,the energy dissipation capacity of cast-insitu specimens decreased,while the prefabricated specimens continued to rise.The bearing capacity of precast specimens is slightly lower than that of cast-in-place specimens,but the difference is not more than 5%.The bearing capacity degradation and stiffness degradation of the two specimens are similar,and the stiffness of the two specimens is equivalent in the whole cyclic loading process.The ductility of precast specimens is slightly better than that of cast-in-place specimens.(3)The embedded steel bolt connection node used in this paper is reliable and has good force transmission performance.When the prefabricated frame and frame-shear wall specimens reach the ultimate bearing capacity,the development of cracks in the core area of the joints is significantly weaker than that of the cast-in-situ specimens,and the steel and column base reinforcement in the connection area have yielded,which conforms to the failure mechanism of strong joints and weak components.(4)The influence of concrete strength and axial compression ratio on the embedded steel bolted connection frame is obtained.Through ABAQUS simulation analysis,it is found that in a certain range,with the increase of concrete strength or axial compression ratio,the mechanical performance of the specimen will also be improved,but the increase will be reduced.(5)The influence of concrete strength and axial compression ratio on the embedded steel bolted connection frame-shear wall is obtained.For medium and low strength concrete,the improvement of strength grade will also improve the mechanical performance of the structure,and the improvement effect is equivalent.When the axial compression ratio is in the range of 0～0.45,with the increase of axial compression ratio,the bearing capacity and stiffness of the structure will be improved,but the overall cooperative work performance will decrease.The paper has 62 drawings,13 tables,81 references.