Study On The Influence Of Seismic Performance Of Multi-storey Light Steel Residence

With the development of the economy,sustainable development is the mainstream direction today.The development of the construction industry has not been optimistic,mainly inefficient and labor intensive,especially for the environment.The light steel keel structure has the advantages of light weight,high strength,standard production,short construction period,energy saving and environmental protection,etc.It can be promoted in the construction industry and can solve the problem of low-rise housing in remote areas.It has a positive role in promoting the housing industry in China..The light steel keel structure system uses light-weight materials such as cold-bent thin walls,which can realize prefabrication of industrial chemical plants in the construction industry.Through factory prefabrication,the material can be effectively utilized and the efficiency of on-site construction can be improved.Prefabrication in the factory can also improve industrial technology.And promote the promotion of development in society.Obviously,it can reduce the environmental pollution.At present,the light steel residential structure generally builds a two-storey or three-storey low-rise residential system.The user is not satisfied with the current housing area.The structural system will be built under the condition that the earthquake load can ensure the safety of the house.Multi-layered.In order to solve this problem,this paper studies the change of aspect ratio and the change of longitudinal width under the action of earthquake.The research on the overall seismic performance of light steel structure uses SAP2000 finite element software to establish nine structural overall models,using time history analysis methods.The comparison and analysis of several structural reactions under earthquake action.The specific work is as follows:(1)According to the aspect ratio and the change of the longitudinal width,the modal analysis is carried out on the models of the two sets of schemes.When the number of layers(aspect ratio)of the light steel keel structure system is continuously increased,the frequency of the structure is gradually smaller and smaller,and the cycle is gradually increased.In inverse proportion to the frequency,it appears to gradually become larger and the stiffness gradually becomes smaller.Compared to K-11(twolayer structure),K-12(three-layer structure),K-13(four-layer structure),K-14(fivelayer structure),K-15(six-layer structure)The vibration period(1st order)showed a significant increase of 54%,111%,185%,and 268%,respectively.When the longitudinal width(opening number)of the light steel keel structure was changed,it was compared with the K-21(single opening).)Structure,K-12(two open),K-22(three open),K-23(four open),K-24(five open)natural vibration period(first order)reduced by 9%,28% 41%,46%;thus the change in the height and longitudinal width of the floor is inextricably linked to the period of self-vibration.(2)The structural floor height(aspect ratio)is different,and the finite element three-dimensional model is established,and the earthquake influencing factors are obtained through time-history analysis.The results show that as the floor height(aspect ratio)increases,the body lateral stiffness decreases and the overall seismic performance of the structure decreases.Taking the 8 degree rare case as an example,under the action of EL-Centro wave,the maximum interlayer displacement angle is 1/83;under the action of Taft wave,the maximum interlayer displacement angle 1/91 cannot meet the specification requirements,and finally according to different fortification intensity.The area provides reasonable design recommendations.(3)The model establishes the finite element three-dimensional model by changing the longitudinal width,and studies the influencing factors of seismic performance through time-history analysis in the case of multiple encounters and rare encounters.The calculation results are compared and analyzed: the longitudinal width changes the earthquake resistance of the whole structure.The performance is good and the displacement of the overall structure is gradually reduced.Taking 8 degrees rare as an example,under the action of EL-Centro wave,the maximum interlayer displacement angle is 1/209;under the action of Taft wave,the maximum interlayer displacement angle is 1/154 and meets the specification requirements.The above analysis of seismic performance of light steel structures provides a reference for the study of similar structures.