Analysis Of Seismic Performance Of Irregular High-rise Steel Structures

With the development of modernization,in order to make full use of land resources and reduce unnecessary land waste,more and more high-rise structures are appearing in urban construction and development.Because various buildings have their own characteristics,the design In the design process,the teachers consider the aesthetic effect.It is difficult for the structure of the regular structure to achieve the aesthetic effect,so in the process of design,most irregular structures have emerged.Since the 21 st century,earthquakes have occurred frequently,and the impact of earthquakes on buildings has to be considered in the design process,especially the response of irregular structures to earthquakes,which is more important.Due to the instability of the structure itself,seismic action has a greater impact on the structure.In order to stabilize the structure,the seismic energy is dissipated by adding different supporting structures to protect the overall stability of the structure.Therefore,the application of supporting structure to buildings has a broad development prospect.This article first introduces the irregular structure and steel structure system,and then briefly introduces the modal analysis,response spectrum analysis and dynamic time history analysis in the seismic theory analysis method.The second study is the seismic performance analysis of irregular high-rise steel structures,using SAP2000 finite element software to build an irregular building,which is the research object.Four schemes were established by adding different support structures to the object.Scheme one is the original structure,scheme two is the ordinary support structure,scheme three is a herringbone anti-buckling energy-consuming support structure(herringbone BRB structure),and scheme four is a single-inclined rod anti-corrosion structure.Buckling energy dissipation support structure(single inclined rod BRB structure).The modal analysis,response spectrum analysis and dynamic time history analysis of the structure are carried out through the four established schemes.(1)In the modal analysis,it is shown from the flat-torsional characteristics and the natural vibration period of the structure.Under the four schemes,the structure mainly has the translational effect in the first two modes,and the torsional effect in the third mode.,The effective mass participation coefficient of the first 15 modes has reached more than 90%,which meets the requirements of seismic codes.The first natural vibration period under the four schemes are 3.085 s,2.113 s,2.086 s and 2.309 s respectively.Through comparative analysis,it can be seen that the steel frame structure reduces the first natural vibration period of the structure through the influence of the supporting structure.The natural vibration period of the glyph antibuckling energy-dissipating support structure is the smallest,indicating that the natural vibration characteristics of the support structure are the best,and the seismic response of the structure is reduced.(2)Through the analysis of the response spectrum by setting the response spectrum conditions,it can be seen that the floor displacement and the interstory displacement angle in the X and Y directions are significantly reduced after the support structure is added.The support structure improves the lateral rigidity of the model.Compared with the plan two plus ordinary support structure,the floor displacement of the plan three plus herringbone support structure is closer,but the dynamic characteristics of the anti-buckling energy dissipation support are better than the ordinary support.(3)Different working conditions are set in the time history analysis,and through the comparison of three seismic waves under frequent and rare earthquakes,the floor displacement and the displacement angle between floors,the base shear force,the acceleration of the top floor and the shear between floors of the structure are obtained.Power and other related data.Under frequent and rare earthquakes,the interlayer displacement angle of the weak layer of the substructure is relatively large.After the support structure is added,the interlayer displacement angle of the structure is reduced,which dissipates the seismic energy and increases the rigidity of the structure.Based on the above schemes,it is believed that the herringbone antibuckling energy dissipation brace exhibits better seismic performance under the action of an earthquake.Figure:[66] table:[39] reference:[52]...