Analysis On The Performance Of Anti-floating Anchor And Its Effect On Anti-floating Of Basement

With the fast expansion of Chinese economy and urbanization,China’s urban construction has entered a stage of rapid development.High rises and skyscrapers have emerged rapidly in cities,posing greater demands for the embedded depth of the foundation.As there is less and less urban land available for construction,it is highly necessary to develop a large number of underground spaces.Anti-floating design is the main problem of large substructures,such as multi-story basements of high-rise building,underground parking lots and underground shopping malls.In the actual design,designers often overlook the optimal layout of the anti-floating structure and the joint action and deformation coordination of anti-floating structure with the main structure,leading to waste in design or even design errors.This paper aims to explore the optimization of the anti-floating structure and anti-floating anchor placement.It also compares,analyzes and optimizes different anti-floating anchor schemes of anti-floating projects.The author hopes to summarize commonly applicable optimal schemes of anti-floating structures,and their characteristics.Specific works as follows:1)In this paper,the underground anti-floating water level is studied,and the calculation formula of water buoyancy is determined.SAP2000 and Midas building are used to model the raft,and the model of raft foundation and raft foundation is established.This paper analyzes the variation law of the deflection,crack and bending moment of the raft under the influence of the arrangement of the anchor rod,the stiffness of the anchor,the thickness of the raft and the buoyancy of the water.2)In situ test of the floating anchor bar,the U ~ δ curves are drawn,and the data support for the finite element simulation is provided.3)By using the finite element software ABAQUS anti-floating anchor for numerical simulation,analysis of axial force in different load and anchor length under the condition of deformation,anchor and soil anchor distribution,and compared with the engineering test,to provide reference for the actual project.The force and deformation of anchor group under the effect of group anchor are analyzed.4)Based on the research work of finite element software ABAQUS and field test,the theoretical analysis of the stress and deformation of anti-floating anchor is carried out.