The Seismic Reinforcement Scheme Optimization And Effect Evaluation Of Existing Masonry Structure

In recent years,with the development of urban construction,the shortage of construction land,for the existing building reinforcement and disease control gradually get people's attention,the existing building reinforcement technology as one of the important branches of building disease control project,in the modern construction industry occupies an increasing position.The research object of this paper is a masonry structure with long service life and high overrun.by referring to the relevant literature and relevant information,the optimization of the existing masonry structure seismic reinforcement scheme based on the combined weighted-tops decision model is carried out,and the related problems of seismic reinforcement scheme in many objective decision are solved.At the same time,the finite element software ANSYS is used to carry out numerical simulation analysis on a masonry structure,and the effect of the selected reinforcement scheme is illustrated by studying the seismic performance before and after reinforcement.The research idea of this paper is to introduce the detection and identification of the strengthening project to illustrate the main defects of the building,and then design several feasible seismic strengthening schemes.finally,these schemes are optimized and the effect of the selected seismic strengthening schemes is evaluated by numerical simulation.The main contents of this paper are as follows:this paper introduces the process and results of the inspection and identification of a masonry structure teaching building,and concludes that the building has the defects of extended service,high overrun and few transverse walls;The reasons why the seismic results of the structure do not meet the requirements and the wall compression results do not meet the requirements are analyzed.Three feasible reinforcement schemes are formulated,and the advantages and disadvantages of each scheme are analyzed.The choice of the three schemes is a many objective decision-making problem,and the methods to solve this problem are studied.three alternatives are optimized based on the combined weighted-tops is decision model: firstly,the combined weight is determined,which is composed of subjective weight and objective weight,which is more scientific and reasonable;Finally,the ideal solution and the negative ideal solution are determined by the tops is decision model,and thecloseness degree of each scheme and solution is obtained,so that the optimal seismic reinforcement scheme is determined according to the closeness degree.selecting reasonable element type,constitutive relation and material property parameters,selecting and adjusting seismic wave according to building site,design seismic grouping,establishing finite element model before and after reinforcement,respectively analyzing the time course of the finite element model,obtaining the peak displacement response,interlayer displacement response and base shear force of the structure,and finally evaluating the seismic performance of the structure based on interlayer displacement angle.The reinforcement project further proves that the cast-in-place reinforced concrete slab wall reinforcement is a reliable and effective treatment method to solve the problem of insufficient earthquake resistance of masonry structure.The method can ensure the shear strength of masonry structure wall,ensure the temporary completion of the " three-level" fortification target in the earthquake,and provide theoretical and practical reference for similar projects.