Concrete Replacement Of Shear Wall In A High-rise Building Research And Application

With the development of the construction industry,the construction of our country has entered a period of emphasis on repair and construction.The research on the strengthening and reconstruction of building structures has become more mature and the engineering has become more widely used.As one of the most important structural forms of building in China,concrete structure has a wide range of applications and large scale of existing and new constructions.When the structure faces functional transformation or safety problems,the use of reinforcement and transformation technology can ensure the continued safe use of building structures and increase the structure safety service life,accompanied by extremely high economic benefits.Among them,the concrete replacement and reinforcement method is widely used in the reinforcement of concrete beams,walls,and columns,and has achieved good reinforcement effects.However,the prior research of the concrete replacement method for shear walls is lagging behind the construction technology.Therefore,this article uses concrete reinforcement Based on the case study,the research uses unsupported concrete replacement method to strengthen high-rise building shear walls.Based on the research results and construction experience of the predecessors,the axial compression ratio is used as an index to limit the shear wall stress during the construction process.Based on the actual situation,a suitable construction scheme is formulated to ensure structural safety and construction quality during construction of shear wall concrete unsupported replacement.Establishing special strength curve for grout compression strength,and use non-destructive testing to accurately detect the change in compression strength of the shear wall replacement concrete,so as to understand the compression strength bearing capacity of the shear wall.Combination of numerical simulation and measured concrete strain,it is confirmed that there is a stress lag phenomenon in the shear wall strengthened by the unsupported displacement method.The numerical simulation research proves that the construction sequence of the segmental replacement method affects the stress distribution of the reinforced shear wall.The stress of the first replacement wall section is greater than the later replacement of the wall section.The method of replacing the concrete at both ends of the shear wall first will help improve the bending stiffness.The initial stiffness of the force wall,and the seismic performance is better.Increasing the strength of the replacement concrete has no effect on the stress distribution of the shear wall.With the increase of the strength of the replacement concrete,the seismic performance of the shear wall is gradually improved.Taking the case of high-rise residential buildings with shear walls in this paper as an example,the dynamic elastic-plastic analysis method is used to prove that the proper increase of the strength of the replacement concrete has a small impact on the structural safety of this case,and the structure maintains a reasonable force distribution and energy consumption performance,Satisfying the seismic goal of "no collapse for major earthquake".