Seismic Response And Seismic Analysis Of L-shaped Irregular Steel Frame Supporting Structures

With the rapid development of the social economy,people's economy and quality of life have greatly improved,and the requirements for material pursuit have become higher and higher.Buildings that do not meet the rule structure are more likely to pursue irregular and singular buildings.Therefore,many high-rise,irregular buildings stand out.For the irregular planar structure of the upper level,due to its complicated structure and force,different structural structures have different locations of damage and damage under the action of earthquakes,and the damage caused varies.Therefore,it is very meaningful to analyze the seismic capacity of irregular steel structures.This paper is mainly about the seismic effects of different forms of support on high-rise steel structures.Firstly,it introduces the disasters caused by earthquakes,the research on steel structures at home and abroad,and the definition of irregular structures.Then,SAP2000 is used to establish three different supported models for analysis under earthquake action,mainly for modal analysis,response spectrum analysis,linear time history and rare earthquake nonlinear time history under multiple earthquakes,and a certain amount of viscoelasticity.The damper is compared with the rain single slanting bar support in rare earthquakes.The obtained floor displacement and inter-layer displacement angle are used to analyze the seismic performance of different supporting structures,and the weak position of the structure is found for reinforcement.The main contents of this paper are as follows:(1)Using SAP2000 to establish an unsupported model,a model with a single diagonal support,and a model 3 supported by a cross-shaped diagonal rod,and analyze the period and frequency of the first 12-order natural vibration period under modal response.And the quality participation coefficient,to judge that it meets the requirements of the specification.(2)The three models are analyzed under the two-way seismic response spectrum,and the floor displacement and inter-layer displacement angle of the three models are obtained.Through comparative analysis,various variation characteristics of the three models are found,and thus different support pairs are judged.The magnitude of the impact of the seismic performance of the structure.(3)Linear time-history analysis of three models under multiple earthquakes,threeseismic waves were selected for seismic response analysis,and the floor displacement and interlayer displacement angle under different seismic waves were obtained.The seismic response of different supports was judged by comparing the response spectrum analysis of the three models in the elastic phase and the data of the elastic time history analysis.And find the dial-in position of the structure for reinforcement.At the same time,in order to analyze the plasticity variation,the nonlinear time-history analysis under the rare earthquake is carried out in the model 2 supported by the single oblique bar.(4)Perform energy dissipation and shock absorption analysis on a certain number of viscoelastic dampers with structural arrangement,and perform energy dissipation analysis on model 2 with slanted bar support and damper arrangement under rare earthquake to judge the damper Shock absorption effect.By contrasting the damper,the effect of anti-seismic and shock-absorbing energy dissipation is very large,and the effect of avoiding earthquake damage is obvious.