| It is a trend of urban construction to carry out the comprehensive integrated development of rail transit and city based on the TOD(Transit-Oriented Development)model,and adopts the conversion structure to meet the multi-purpose high-rise buildings.In this paper,based on the actual project of a subway overcover building structure in Shenzhen,numerical simulation and experimental research were used to study the seismic performance and the application of seismic energy dissipation technology in fully frame-supported transfer slab RC structure.The major work contents and conclusions are as follows:(1)In this paper,the seismic performance of a fully frame-supported transfer slab RC structure on the upper cover of a subway in Shenzhen iss researched,and the deformation form and seismic performance characteristics of the structure are determined by numerical simulation.The results show that the overall stress and force transmission path of the fully frame-supported transfer slab RC structure are reasonable,the structure has sudden changes in the stress and deformation of the transition slab layer,the maximum deformation and plastic damage appear in the bottom frame area,and the structure meets the seismic code requirements.(2)The quasi-static seismic performance test of fully frame-supported transfer slab RC structure(1/5 scale model)under low cyclic load is carried out.The results show that the hysteretic performance of the structure is stable,the hysteretic curve is an inverse "S" shape,the damage of the structure is mainly concentrated in the bottom frame,the story drift of the first layers of the structure is 1/154,and the structure is shown as "small and medium earthquake elasticity,and local yield in large earthquakes",which can meet the seismic performance requirements of 9 degrees earthquake,and the structure is safe and reliable.(3)For the fully frame-supported transfer slab RC structure,the seismic energy dissipation control is carried out by using the sector lead viscoelastic damper(SLVD)with independent intellectual property rights.The deformation form and seismic performance characteristics of the SLVD structure are clarified through numerical simulation and analysis.The results show that SLVDs improves the deformation capacity and seismic performance of the frame region in the bottom of structure,the story drift and joint displacement are reduced by about 20%～30%,and the damage energy consumption of the structure components is reduced by about 25%～35%.(4)The performance test of SLVD used in fully frame-supported transfer slab RCstructure is studied.The results show that SLVD exhibits good hysteretic deformation ability,and the hysteretic curve obtained is full and symmetrical.SLVD specimens can achieve large deformation with 200% strain amplitude,corresponding to 1/7 story drift of structure.(5)The pseudo-static seismic performance test study was carried out on the fully frame-supported transfer slab RC structure retrofitted by the SLVD after earthquake damage repaired,and the test results and phenomena of the original structure,the damage structure and the SLVD structure were compared and analyzed to determine the seismic performance characteristics of the energy dissipation structure.The results show that the hysteretic curve of the SLVD structure is inverse "S" shape,and the hysteretic curve of the SLVD structure is relatively full.The SLVDs inhibits the structural damage and reduces the energy consumption of the structural damage.The maximum story drift of the structure reaches 1/100,meeting the standard limit value of rare earthquakes,and the SLVD structure exhibits good seismic performance.(6)The refined finite element model of the test model of fully frame-supported transfer slab RC structure and SLVD specimen were established to simulate the test process.The results show that the refined finite element model is reasonable and can be used for structural component optimization and damage analysis. |
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