Study On The Design Of Adding Layer And Seismic Reinforcement For A Brick-concrete Structure

In recent years,some existing brick-concrete structures do not meet the current use requirements,or because of the age does not suffice the requirements of the current seismic code,and it is difficult to guarantee structural safety.Therefore,in order to meet the existing use requirements and seismic code requirements,it is necessary to carry out additional storeys reconstruction and seismic reinforcement design,Which is of great significance today.There are many ways to add layer to brick-concrete structure,and Steel structure is provided with the advantages of light weight and high strength,which also makes it the first choice,what is more,it have small impact on the original structure foundation.In this dissertation,the teaching building requiring additional floors and seismic reinforcement is treated as the object of study.Through finite element method numerical simulation,the stress change of masonry wall in the process of displacement control loading is studied.The difference of hysteretic curve and skeleton curve before and after wall reinforcement is studied.According to the testing and appraisal results of the teaching building,appropriate reinforcement methods are selected to reinforce the structural components that do not meet the seismic requirements.The specific contents are as follows:(1)Summarizes the common earthquake damage of brick structure form briefly,beside frequently-used seismic strengthening reinforcement methods and its pros and cons,selecting the applicable test and materials for reference,determining the finite element parameters and establishing a test wall model based on the selected tests for static loading analysis.Then compare the skeleton curve of the test wall with the skeleton curve obtained by numerical simulation,The validity of the masonry wall model has been verified;(2)Based on engineering examples,accordance with the material constitutive model,material and the CDP model shape parameters,establishing a model of the single-piece wall before and after reinforcement and quasi static loading analysis.the hysteresis curve,skeleton curve,stiffness degradation curve,the total energy consumption curve and ductility coefficient between the two used to study the seismic performance changes of the wall after reinforcement.(3)Analyzed the detection results of a brick-concrete structure teaching building,and used it in an engineering example to design the connection node between the light steel added structure and the original structure,and the components of the teaching building which do not suffice the seismic requirements will be strengthen;The seismic performance of the teaching building after reinforcement is calculated by the PKPM software,At the same time,the seismic performance before and after reinforcement is analyzed and compared in terms of seismic calculation,compression calculation,structural inter-story displacement and inter-story displacement angle.Judge from the consequence,the seismic capacity of the reinforced structure is greatly improved and meets the seismic requirements.This method has a certain reference value for the brick-concrete structure that needs to be reinforced with additional layers.