| In the vast southwestern region,the terrain is complex and varied,while the mountainous layered framework structure exists extensively in these mountainous regions.In particular,the earthquakes in Sichuan,Yunnan,and other regions have repeatedly occurred.For the construction of buildings on them,the importance of seismic research becomes more and more prominent.According to past experience,seismic isolation technology and BRB reinforcement technology have a good effect on reducing the impact of earthquakes.Therefore,the introduction of seismic isolation technology and BRB reinforcement technology into the mountain bypass frame structure will certainly become a trend.In this paper,the OpenSEES numerical simulation is used as the research method,and the mountain layer structure is the research object.The simulation of the seismic isolation device is carried out.A non-isolated model,four seismic isolation models and a BRB reinforcement model are established,under the action of rare earthquakes.Seismic performance study: The reliability of the isolation device simulation was analyzed;the non-isolated model was compared with the isolation model,the calculation model with different types of isolation devices,and the calculation model with different number and location of the isolation devices;A seismic isolation model was reinforced using BRB,and the earthquake resistance after reinforcement was summarized.The specific research content is as follows:1 The test data of the LRB600 lead rubber shock isolation bearing was collected.The FPB friction pendulum shock bearing was selected.The hysteretic curve of the two kinds of isolation devices of OpenSEES was used to simulate the hysteresis curve of the simulation through the experimental values and Theoretical value to verify.2 Summarize the test results of the simulated layer-down frame structure at home and abroad,and verify the correctness of the OpenSEES simulation layer-down frame structure.By using SAP2000 and OpenSEES,the static analysis and eigenvalue analysis were performed on the established calculation model.The first ten cycles of the eigenvalue analysis and the base vertical reaction force of the static analysis were compared.3 The isolation support blocks most of the energy of the ground motion into the superstructure and has good energy dissipation capacity.Therefore,the seismic isolation model shows better seismic performance than the non-isolated model.However,afterinstalling the seismic isolation device on the upper ground surface,the constraint on the upper ground-facing structure weakens,the structure moves horizontally,and the displacement between layers of the lower layer floor increases,so it is recommended to increase the stiffness by adding BRB.4 The seismic isolation performance of the LRB600 is better than that of the selected FPB.This is due to the fact that the LRB600 has better regulation and energy dissipation,and can also take part of the floor shear.The 1st floor non-grounded column is relatively less than the 1st floor grounding column.In the 1st floor,the non-grounding column is equipped with an isolating device.The stiffness ratio inside the floor is not changed so much.The effect of vibration isolation is not clear.5 Due to the increased displacement between the layers of the lower layer after the isolation bearing is installed,refer to the layout of BRB in the relevant literature.Select a seismic isolation model to analyze the layer-removal part and the Y-arrangement of BRB.Analyze that BRB has increased.The structure resists lateral stiffness and energy dissipation after yielding,which effectively reduces the displacement between the layer-removing portion and the Y-layer... |
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