Study On The Effect Of The Isolation Layer Arrangement And The Combination Of Seismic Isolation On The Seismic Isolation Of The Steel Frame Structure

In recent years,vibration isolation technology has been developed rapidly,especially rubber vibration isolation bearings and damping shock absorbers are used in the structure of vibration isolation,which is more and more popular as a new concept of vibration isolation.At present,the forms of isolated buildings in various countries include reinforced concrete structures,masonry structures and steel structures.Domestically,China has built a large number of multi-layer masonry isolation structures and multi-story reinforced concrete isolation buildings,and some buildings have also withstood the test of large earthquakes,but the application of isolation technology in steel structures is relatively rare.In addition,there are many problems in the application of seismic isolation technology in actual engineering.For example,the specific layout of the isolation device,the effect of the isolation layer selection on the isolation effect,the joint application of isolation and shock absorption technology,etc..This article focuses on the above problems,with a view to providing reference for the selection of building isolation schemes and joint application of isolation and vibration reduction technology.Combined with a multi-layer steel frame engineering example,SAP2000 was used to establish a three-dimensional finite element model,and the seismic isolation bearing was selected according to the specifications,and three seismic waves were selected for dynamic time history analysis.First,by comparing the seismic response of different types of isolation bearings with different numbers and different locations,the rule of the impact of the isolation bearing arrangement on the isolation effect of the isolation structure is explored,and the better plane arrangement method of the isolation bearings is selected.Secondly,by comparing the isolation effect of the isolation layer at the bottom and top of the first column,explore the influence of the location change of the isolation layer on the isolation effect,as well as the characteristics and applicable conditions of the base isolation and layer isolation.Finally,the seismic isolation effect of the seismic isolation and joint structure is analyzed concretely,and the improvement degree of the seismic isolation and joint structure is compared with the traditional seismic structure.The analysis and research results show that: when common rubber bearings andlead rubber bearings are mixed,different number of combination schemes will have different effects on the structure's isolation performance;When the number of the two types of isolation bearings is fixed,the lead-core isolation bearings are arranged on the surrounding columns,and the natural rubber bearings are arranged on the middle column.By comparing the base isolation and layer isolation,the base isolation is better than the layer isolation in terms of performance alone,and it should be a better choice in high-intensity areas,but the floor isolation has the advantages of simple and economical construction facilities,flexible support maintenance and maintenance,and designers can choose the appropriate location of the isolation layer according to the actual working conditions.In addition,when adding layers to the original building or under special site conditions,only floor-seismic earthquakes can be selected.Finally,through the specific analysis of the isolation effect of the seismic isolation and joint structure,after using the seismic isolation and isolation technology,the structure can be found according to the specification to reduce the intensity of a fortification,and the design can reduce the cross-sectional size of the member to save costs,To provide a reference for the design of seismic isolation and joint structure.