Study On Technical Scheme Of Whole Translation Of Steel Framed Buildings

With the development of large-scale urban renewal and urban renewal in China,a large number of buildings have appeared,which are not built for long and still have great value,but are in conflict with urban development planning.The whole displacement technology of buildings has become an effective measure to solve this contradiction.Based on the overall translation of a steel frame structure in a market,this paper designs the translation route for the overall displacement of the building,and designs the two-way translation scheme and underpinning system.In this paper,the finite element analysis method is used to analyze the stress state of the superstructure and underpinning system under different jacking conditions.In addition,two different load-time schemes are designed for the jacking force of the building during displacement.This paper analyses and compares the transient dynamic analysis of buildings under different loads and time when they are displaced.Transient dynamic analysis includes the acceleration and velocity response of the whole structure and the stress state of the whole structure and underpinning reinforcement system.According to the actual engineering situation of the building,this paper designs the translation route in detail for the overall displacement of the building,determines the vertical and horizontal two-way translation scheme,chooses the underpinning scheme of the single beam under the column to be the underpinning scheme in the process of translation,and reinforces the underpinning system of the vertical and horizontal translation of the building,so as to ensure the safety of the building in the process of overall displacement.In this paper,the finite element analysis software ANSYS is used to establish a three-dimensional finite element model to analyze the stress of the superstructure and underpinning system under different pushing conditions during the whole displacement of the building.The fourth strength theory is used as the failure criterion for the steel frame structure under underpinning conditions,that is,the equivalent stress of the whole structural member reaches the compressive strength of the member.At the same time,the stress analysis of underpinning reinforcement system under adverse pushing conditions is also carried out in this paper.In order to further satisfy the safety requirements in the course of building translation,the transient dynamic analysis of the building under different load-time action is carried out,and the three-dimensional solid model is established by using the finite element software ANSYS.By comparing the modal analysis and time-history analysis results under translation state,the natural vibration period and main vibration direction of the whole structure are obtained.In this paper,through comparative analysis,the natural vibration period of the structure is avoided and the influence of the natural vibration is reduced in the translation process.At the same time,it is concluded that the dynamic response of acceleration,velocity and displacement of the whole structure is related to the time interval of load action.The fluctuation of the time-history curve under the smaller time interval is smaller than that under the larger time interval.When the jacking load is applied,the time interval of the change of the jacking load is as small as possible to avoid the large dynamic response of the whole structure during the jacking process.