| As the types of building structures are more and more irregular and diversified,the torsional vibration effect will inevitably occur in buildings under earthquakes,sometimes accompanied by stress concentration.Therefore,in order to ensure the stability of the structure,energy consumption and shock absorption technology The application in engineering is very necessary.This article mainly introduces the influence of lead rubber base isolation support(LRB)and support system on the steel frame structure,in which the lead rubber support is between the upper structure and the lower structure of the structure.Seismic isolation layers are arranged between them,so that seismic energy is concentrated at the seismic isolation layers,and the structure period is extended to achieve the anti-seismic effect;the support system is to use the reasonable arrangement of the external support of the structure to reduce the interlayer displacement and interlayer displacement angle of the structure,so as to achieve Anti-seismic effect.This paper takes a plane irregular high-rise steel frame structure as the research object,and uses SAP2000 software to establish model 1(original structure),model 2(plus herringbone support structure),model 3(interlayer LRB structure),and model 4(Joint structure of support and LRB),by comparing the stability of the structure in four states,analyze its seismic performance.The main research contents and methods are as follows:(1)Extract the first 12-order natural vibration period and mass participation coefficient of the structure,and perform modal analysis on the structure to obtain the periodic and torsional characteristics of the structure.Take the first three-order representative data analysis and obtain it,the structure with LRB support has a natural vibration period of 3.124 s,which is 33% higher than the 2.343 s without vibration isolation support structure.It shows that the installation of the isolation support can extend the period of the structure.Taking the analysis of the first three orders of vibration mode,we can see that the first two orders of the structure The vibration modes are mainly translational,and the third-order vibration mode is mainly torsion.(2)The analysis of the response spectrum obtained from the response spectrum conditions and the response spectrum function shows that the structure with the chevron support and lead rubber bearing has better shock absorption effect than the original structure,and the effect of the support and LRB under the joint action the best.(3)Based on the finite element dynamic time history analysis,the interlayer displacement and interlayer displacement angle data of the structure under different seismic waves are obtained.Combining the base shear and bending moment of the structure and the interlayer shear data of the structure,the support and The structure under the combined action of LRB has the largest change in interlayer displacement and the best seismic performance.The results are consistent with the response spectrum analysis.In order to explore the impact of different support systems and different placement positions of LRB bearings on the seismic performance of the structure,the model five plus single inclined rod support,model six plus X-shaped support,and model seven are equipped with LRB support structures on the top of the tenth floor.For different support systems,the structure with support can improve the lateral stiffness of the structure.Among them,the X-shaped support is the best,followed by the chevron-shaped structure,and the structure with the single diagonal rod is the worst;In terms of the location of the LRB support,the natural vibration period of the structure with the LRB support is significantly extended.The installation of the LRB support can reduce part of the earthquake effect and improve the seismic performance of the structure.The LRB support is set on the top of the third floor The self-vibration period of the seat is greater than the top of the tenth floor.The lower the position of the isolation support,the better the earthquake resistance of the structure.Figure: [100];table: [36];reference: [55]... |
