Research On The Tilting Damage Of The Foundation Form Of Brick-concrete Structure In Mountainous Area

In recent years,with the acceleration of urbanization,the utilization rate of mountainous sites has gradually increased.There are many unfavorable geological conditions in mountainous areas.Uneven settlement is easy to occur once the foundation is poorly treated or improperly used in the later stage.Brick-concrete structure is a little weak in ductility and it is more susceptible to damage when uneven settlement occurs.When the ground treatment and the later use are identical,the choice of the form of foundation directly affects the safety and usability of the whole building.Therefore,the analysis and research on the inclined damage of the brick-concrete structure of the mountainous area under different basic forms has practical significance.Based on the relevant literature and related engineering materials,the related theoretical research and finite element analysis at home and abroad are briefly introduced.Taking a brick-concrete structure residential building in Zhangjiakou area as the research object,based on ABAQUS finite element software,the tilting damage of the brick-concrete structure residential building with strip foundation and raft foundation under different inclinations is analyzed.The main tasks are as follows:(1)The ABAQUS finite element model of foundation soil-foundation-upper brick-concrete structure is established,and the basic assumptions of the model are defined;The determination of the model unit,geometric dimensions and constitutive relations of related materials is described;The grid,load,analysis step,boundary conditions and contact constraint settings and analysis conditions of the finite element model of the project example are introduced.(2)According to the finite element analysis results,the influence of the strip foundation with width of 1.4m,1.8m and 2.2m and thickness of 0.4m and 0.6m on the deformation,foundation stress,superstructure displacement and superstructure stress of the building was analyzed in detail under the inclinations of 0.1m,0.2m,0.4m and0.6m.(3)The influence of raft foundation with thickness of 0.4m,0.6m and 0.9m and raft cantilever length of 0.7m,0.9m and 1.1m on the deformation,foundation stress,displacement of superstructure and stress of superstructure is analyzed in detail under the inclination of 0.1m,0.2m,0.4m and 0.6m.(4)The influences of the two types of foundations with thickness of 0.4m,strip foundation width of 1.4m,1.8m,2.2m and raft foundation cantilever length of 0.7m,0.9m,1.1m on the inclined damage of superstructure were comparative analyzed.(5)Through correlation analysis and research,it provides a reference for the choice of the basic foundation of brick-concrete structure in mountainous area from the perspective of structural safety and economy.Finally,the results of all the research were summarized and some suggestions were made for the follow-up research.