Research On Support Structure And Its Effect On Seismic Strengthening Of Brick-concrete Structure

Brick-concrete structure as a very common form of building structure in China,has been widely used in various construction projects since the 1970 s.But the actual engineering proves that its masonry materials have poor bending,shear and tensile properties,weak mortar adhesion,and poor integrity,and other shortcomings have gradually appeared.The previous earthquake disaster statistics also show that the brick-concrete structure is prone to damage under earthquake,so it is of great significance to strengthen the brick-concrete structure before earthquake.This paper designs a variety of support structures for reinforcement of brick-concrete structures,studies the damage forms and characteristics of brick-concrete structures under various working conditions,and compares the seismic reinforcement effect of the support structures on the brick-concrete structures under different earthquake intensities.So as to provide a reference for the actual project.The main research contents of this article are as follows:(1)Design of supporting structure.Based on the application characteristics of the support structures,the wood is determined as its material,and the physical and mechanical properties of the material selection are introduced in the paper.At the same time,based on the destruction characteristics of the brick-concrete structure and referring to the actual seismic and rescue support tool construction experience,the "door" and "window" support structure forms are designed in the paper,and the specific geometric dimensions and application environment are given.(2)Analysis of the mechanical properties of the supporting structures.The thesis uses ABAQUS to establish the finite element model of the support structure,and uses the displacement-controlled loading method to analyze the vertical and lateral bearing capacity of each form of supports;through the change of displacement and stress,the vertical and lateral ultimate bearing capacity and ultimate displacement of the support are obtained,and the performance characteristics of each support are compared and studied.(3)Establish brick-concrete structure model.Based on the characteristics of common brick-concrete residences,this paper designs a three-story brick-concrete structure as the research object,introduces its material parameters,and compares with the specifications to verify the rationality of its design.At the same time,ABAQUS was used to select CDP model and integral modeling method to complete the establishment of finite element model of brick-concrete structure.(4)Analysis of the reinforcement effect of the supporting scheme.ABAQUS was used to study the wall damage and interlayer displacement of the brick-concrete structure model under seismic load with or without support.The comparison found that the damage of the brick-concrete structure mainly occurred at the opening of the doors and windows,the bottom wall of the first floor,the corners of the building and the connection of the wall,which is consistent with the actual earthquake damage performance.The selected four kinds of supporting and matching use have good reinforcement effect on the brick-concrete structure,of which the C3M2 combination effect is the best.The replacement or superimposed use of "window" type and "door" type supports has a limited impact on the final reinforcement effect.The floor where the support is arranged has a significant effect on the reinforcement effect,and it should be ensured that there is support on the lower floor.As the strength of ground motion increases,the reinforcement effect of the brick-concrete structure will gradually weaken.Therefore,it is feasible to use supports to carry out seismic reinforcement of brick-concrete structures.