Elastic-plastic Seismic Response Analysis Of Inter-layer (column Top) Isolation System Considering P-? Effect

With the advancement of science and technology,the technology that resists earthquakes has become more mature.After decades of development,the seismic isolation system has a complete theoretical analysis and technical system.Under the test of actual earthquake damage,it has exerted excellent isolation effects.Effectively safeguard human life and property safety.In recent years,the earthquake-isolation system is blooming all over the world.It is necessary for further study the isolation system,especially the effect of the second-order gravity effect on the structure.Because the existence of the seismic isolation layer will lead to the change of the overall stiffness of the structure,the P-? effect is more detrimental to the dynamic response of the structure.This article takes the actual project as the research object.The building is a 6-story frame structure.Firstly,the Mander model is used to define the constitutive relationship of the materials used in the structure,and the earthquake-resistant system,the base-isolation system and the layer interval system are analyzed through the direct integration method.The dynamic response of the structure under seismic system and the comparison of cycle values,inter-story shear forces,and interlayer displacement angles demonstrate the superiority of isolation and the rationality of selection.Secondly,the elasticity analysis of selected structures mainly solves: Cantilever The dynamic response of the column size to the overall structure,the effect of the P-? effect on the layered-seismic system,and the influence of the lower structure on the overall structure of the pull-beam are combined to select the appropriate component dimensions for all factors;then the P-? effect is considered.Based on the effect,the elasto-plastic treatment of the structure is performed by defining the constitutive relationship and inserting the fiber hinge to further investigate the elasto-plastic analysis of the understructure of the column-to-bed seismic isolation system and draw the corresponding IDA curve;For the data analyzed above,the “Code for the Design of Architectural Isolation”(draft for soliciting opinions)was selected to give the quantitative index values,and the seismic isolation system for the inter-story column top was adopted.Seismic fragility substructure analysis,the probability of each substructure beyond different stages,to arrive at an overall configuration of exceeding probability;Finally vibration table test the correctness of the selection and finite element simulation contrast proof structure.The content of this paper is mainly divided into the following sections:(1)Make a theoretical derivation for the selected frame structure,and compare the theoretical analysis method with the finite element software analysis method to prove that the finite element software can simulate the actual dynamic response of the structure well,and then use the material constitutive structure of the structure.The definition of the relationship,while calculating the plastic hinge length during elastoplastic analysis;(2)Analyze and prove the rational selection of structures,and analyze the differences in the dynamic response of the three types of structures according to the seismic design,base-isolation design,and interval-seismic design of the same building,highlighting the superiority of the seismic isolation system.Sexuality,to prove the rationality of the segregation system of the selected layer,and to compare the dynamic response of the anti-seismic system and the substructure of the seismic isolation system;(3)Under the selected structural system,the detailed analysis: the dynamic response of the cantilever column size to the overall structure,the specific influence of the P-? effect on the layered seismic system,and the overall structural dynamic response of the lower structure with or without the beam structure influences;(4)Perform incremental dynamic analysis on the selected structure to simulate the entire process from elasticity to elastoplasticity until the structure collapses.Understand the dynamic response of the interval-seismic system under different seismic levels,and evaluate the possible future seismic levels.,Predict structural dynamic response;(5)Based on the IDA analysis data,the vulnerability of the structure is analyzed,and the quantitative indexes given by the new isolation standard are used to analyze the superstructure,the seismic isolation layer and the substructure of the layered seismic isolation system at different performance stages.Exceeds the probability to determine the overarching probability of the overall structure;(6)Using shaking table test and finite element simulation to simulate the dynamic response of the actual structure under the action of ground motion,analyze the test acquisition data and finite element analysis data,and compare the dynamic response of the three structures to prove that the earthquake isolation system has very separating the effects of earthquakes can effectively reduce the impact of earthquakes on the structure,and at the same time,it confirms the rationality of selecting the interval earthquakes in this paper.