Foundation Settlement Response Analysis Of Frame Structure And Strengthening Research

The reinforced concrete frame structure is the most widely used form of building structure in construction.The uneven foundation settlement seriously affects the safety of the frame structure of the building.This paper mainly studies the variation law of internal force and displacement of frame structure under foundation settlement and corresponding reinforcement measures and draws corresponding conclusions and suggestions(1)I use the ABAQUS to establish a five-story structure of the overall framework for the settlement of the framework of the impact of the simulation analysis.In this paper,unequal settlement analysis and integral settlement analysis are carried out.Four conditions are set up for unequal settlement(S1 no settlement,S2 independent settlement of a column with footing,S3 independent side column settlement,S4 combined settlement).The analysis results show that the influence of independent foundation settlement on the frame is partial,and the axial force of the independent column connected to the settlement column changes greatly.The moment and shear force of the beam connected with the settlement column changes obviously,the farther away from the settlement,the influence of the column is smaller.The influence of a column with footing is smaller than that of the independent side column under the same amount of settlement.No matter what kind of independent settlement method,the influence of displacement increases with the increase of the layer height,and the influence of internal forces decreases with the increase of layer height.(2)The integral settlement set three conditions(S1 condition is the integral uniform settlement,S2 condition is the integral tilt settlement,S3 condition is the "basin-shaped settlement).Through the analysis:it can be concluded from the analysis that the effect of integral settlement on the internal forces and displacements of the frame structure is global,and the integral uniform settlement has little effect on the frame structure and is almost negligible.The whole tilt settlement has little effect on the frame structure under the condition of small inclination.However,the influence of "basin-shaped"settlement on the frame structure is larger than the integral tilt settlement,but the influence is smaller than the unequal settlement on the surrounding components.Therefore,as much as possible in the design should consider the basis of the strip or the raft foundation.(3)Calculating the internal force of a frame structure with actual settlement,convert the monitored settlement data into a displacement load and load it into the finite element software to calculate the internal force,and propose a method based on finite element internal force calculation to judge the frame structural safety.It can provide reference forjudging the safety of the upper frame structure.(4)The common foundation reinforcement and structural reinforcement measures are studied in this paper.Through the case study,we will focus on the measures for strengthening jet grouting piles and increasing the section method The rotating jet grouting pile can adjust the rotating speed and increase the speed and slurry mixing ratio.It is concluded that the rotary jet grouting pile has the advantages of strengthening silt and sand foundation and is suitable for urban narrow construction environment.Section enlargement method strengthen the upper structural members with a good bearing capacity and stiffness.