Application Research On Anti-float Of Anchor Rod In Basement Of High-rise Podium

With the rapid improvement of China's engineering construction technology level,urban construction is developing in the direction of high-rise.China has a high population density and limited space for human activities.Therefore,the investment and construction of underground space has attracted widespread attention.High-rise buildings with one or more basements,underground garages,underground plazas and other structures are continuously put into use.Groundwater has a significant impact on these underground structures,making the study of anti-floating issues the key to the construction of underground projects.When the buoyancy of groundwater is greater than the total weight of the structure and its upper load,the basement and podium structures of high-rise buildings are in a state of compensation or overcompensation.Under the continuous influence of groundwater buoyancy,the underground structure will be destroyed.There are two types of damage to the underground structure under the action of groundwater: one is the local damage type.When the bottom plate of the underground structure is subjected to uneven groundwater buoyancy,it cracks or bulges,causing the bottom plate to break,causing groundwater to flow in Indoors,this situation is more common in the basement of high-rise buildings.Furthermore,it is the overall destruction of the structure.The underground structure will rise up under the action of groundwater.At this time,the foundation floor will be destroyed,and the joints of important parts such as beams and columns will also crack,resulting in the instability of the underground structure.The anti-floating scheme adopted for the underground structure generally includes the weight method,the drainage method and the addition of anti-floating structural members.In a series of anti-floating measures,anti-floating anchor rods are widely used in engineering construction due to their advantages of simple manufacturing process,flexible layout,short construction period and convenience,and relatively low structural cost.This article mainly uses the actual engineering case as the background to carry out anti-floating design for the basement of a skirt building of a high-rise building,and explores how to select anti-floating measures reasonably.The design calculation of anti-floating anchor and the calculation of anti-floating capacity were carried out,and then ABAQUS finite element analysis software was used to model the anti-floating anchor and the base plate of the basement,and to study the bottom plate under different arrangements of anti-floating anchor Stress situation,the stress analysis and simulation of the reinforced concrete bottom plate provides a better anti-floating effect of the optimal plan,and contributes to saving engineering cost.On this basis,the optimal design of the anti-floating anchor rod will provide a valuable reference for the design of the anti-floating structure of the basement in the future.The main results and work of this research are as follows:(1)By reading domestic and foreign literature on anti-floating design of underground engineering structures and industry standards,grasp the development status of anti-floating engineering in basement,compare anti-floating measures of underground structural engineering,and select the best anti-floating design plan;(2)Combining specific cases,discuss the stability of anti-floating in the basement,and select appropriate anti-floating measures from the perspective of economy and safety;(3)Use anti-floating anchors to reinforce the project,use ABAQUS finite element software to analyze the effect of anti-floating anchors on the anti-floating effect of the basement floor,and perform variable parameter analysis to find the effect of different parameter changes on floor deformation;(4)According to the results of finite element variable parameter analysis,it can be concluded that the arrangement of the anchors under the floor and the thickness of the concrete floor have a great influence on the bearing capacity of the structure under water pressure and the deformation and displacement of the floor.The specific realization is as follows: changing the arrangement of the anchor bolts under the bottom plate,and arranging the anchor bolts in the middle area of the bottom plate is helpful to reduce the maximum stress of the bottom plate and the deformation and displacement of the bottom plate.Risk of damage to the structure;under the premise of unchanged anchor arrangement conditions,properly increasing the thickness of the concrete floor can effectively reduce the deformation and displacement of the floor,and can improve the stress distribution of the reinforcement inside the floor and reduce the intermediate area The maximum stress value of the anchor.Figure[22] table[15] reference[61]...