Research On Lifting And Correcting Tilt Of Brick-Concrete Structures

In recent years,with the rapid development of China’ construction industry,a large number of brick-concrete strctures have caused tilt problems for various reasons.If it is directly dismantled,it will not only affect normal life but also hinder the sustainable development of the environment.In order to ensure the safety of inclined buildings and reduce unnecessary losses,it is necessary to rationally reinforce the corrective measures.Based on the brick-concrete apartment,this paper develops a plan of underpinning correction based on the existing rectification theory of brick-concrete structure,and analyses the underpinning correction and uplift by finite element software.The main research contents are as follows:(1)According to the geological conditions and reasons for the slope of the project,the internal force of the original brick concrete structure is calculated by PKPM.According to the engineering practice and comparing the existing jacking schemes.the H type steel underpinning system and the lifting and correction scheme for the steel truss transfer system are proposed.(2)Combined with constitutive relation of masonry material,the key technical parameters of brick concrete structure jacking up are determined.According to the design of rectification plan,the loading distance of jacking is further studied by numerical simulation.The research shows that the best jack up distance is 1.2m.(3)The ANSYS finite element analysis software is used to consider the elastic and nonlinear constitutive relation of masonry material,establish the local wall model of H type steel underpinning system and steel truss replacement system,and compare and analyze the two kinds of underpinning schemes.The analysis shows that the two kinds of underpinning systems can achieve the lifting work well and the truss structure During the underpinning,the force reached 69.6%.(4)Finally,according to the characteristics of the brick concrete structure and the coordination of the structural deformation,the cooperative work of the brick concrete structure and the steel is studied.The research shows that the wall does not destroy when the lift displacement difference is-1.2mm to 1.45 mm.