Analysis Of Strengthening Design Based On Damage And Behavior Status For Existing Single Storey Factory Building

Before the eighties of the last century,the reinforcement,transformation and reuse of concrete industrial plants have been gradually valued by the state and society.From the initial direct use to the reinforcement and transformation based on the current situation to make it meet the requirements of reuse function,so as to better play the role of these industrial buildings and preserve their historical traces,this design concept has gradually become a professional special technical product.Due to the change of service function,the approaching of structural design period,the aging under long-term natural and normal use conditions,the damage of structural components,the erosion of industrial production environment,the possible defects in construction and the deterioration of structural materials,as well as the damage caused by natural disasters and improper human handling,most of the single-layer concrete industrial plants in the 1970 s were faced with the question of whether to demolish the old and build the new.Engineering practice shows that it is necessary to reinforce,transform and reuse them.Firstly,many of them,as historical and cultural heritage,have multiple functions such as history,culture and education;secondly,they can greatly save social costs;in addition,they also conform to the concept of green development,reduce the disturbance to surrounding buildings and achieve the goal of saving construction period.In this paper,the hydraulic transmission workshop of CRRC Beijing Erqi Locomotive Co.,Ltd.,which is representative of the concrete single-layer industrial workshop in 1970 s,is selected as the research object.The building needs to be reinforced and transformed to meet the requirements of the Winter Olympic training venue.First of all,based on the existing stress and damage of structural components,according to the relevant specifications for identification and analysis,then according to this,the design concept and structural measures of structural reinforcement are given and compared,so as to put forward the reinforcement scheme and confirm its feasibility through calculation and analysis.The main conclusions are as follows:(1)Overall reinforcement: the roof and even the whole structure are strengthened by adding longitudinal horizontal tie bars at the top chord of the roof truss,so as to eliminate the structural hidden danger caused by the welding damage between the roof panel and the roof truss.Midas software is used to establish its finite element calculation model,to investigate its original state,add tie bar and the buckling mode after reinforcement and transformation,and to verify that adding longitudinal horizontal tie bar of roof top chord can enhance the overall stiffness and stability of the structure and achieve the effect of reinforcement.In addition,the displacement and stress between the roof panel and the roof truss under three kinds of effective welding conditions,such as three points,two diagonal points and two long side points,are compared and analyzed,and the influence degree of them on the action of substitute tie bar is given.(2)In the aspect of local reinforcement: Based on the analysis of conventional reinforcement methods,a new lattice reinforcement method with enlarged section is proposed,which solves the problems of eccentric action of upper column position and insufficient bearing capacity caused by the increase of roof load due to the change of bent column function;the lower column and foundation of bent column are rechecked to make sure that they do not need reinforcement.