Research And Construction Monitoring Of Segmented Replacement Reinforcement Technology Of Shear Wall Without External Support

Taking a high-rise residential building as the engineering background,this paper introduces the method of segmented replacement reinforcement of the shear wall without external support.In order to analyze and study the change of stress and strain during the replacement and reinforcement of the shear wall,and to avoid the shearing of the shear wall In addition,when the bearing capacity cannot support the upper load,the unreplaced and replaced wall sections are monitored in real time through surface-type and embedded-type intelligent strain gauges to observe whether the stress value during the replacement of the shear wall is below the specification limit,and Use the "life and death unit" in the ABAQUS finite element software to simulate the cutting and grouting conditions of the replacement wall section,and then compare and analyze the monitored data with the finite element simulation values.According to the comparison between the field monitoring data and the results of finite element analysis,it was found that according to the original four-batch replacement method of dividing the shear wall into equal widths,the bearing capacity of the shear wall during the replacement process did not meet the upper load,but with the replacement After the strength of the new wall section rises,the overall bearing capacity of the shear wall gradually improves.After the final reinforcement of the shear wall is completed,the strength of the new wall after replacement is improved compared to the original shear wall,and the wall bearing capacity is sufficient with its upper load,the reinforcement effect basically meets the requirements.By analyzing the stress distribution after the completion of the shear wall replacement,it is found that the stress distribution of each replacement wall segment decreases sequentially according to the replacement order.This is because the stress hysteresis effect causes the stress of the first replaced wall segment to be greater than the stress of the later replaced wall segment,although the reinforcement The load-bearing capacity of the shear wall is improved,but the stress gap between the replacement wall sections is large,which affects the overall performance of the shear wall.Therefore,in order to solve such problems,the number of batches divided from the shear wall And the width of the replacement wall section,and combined with the ABAQUS finite element software to simulate,the results show that when the shear wall is replaced by three batches of reinforcement,the stress level during the replacement process is higher and the construction safety is lower.After the replacement,the stressdifference of each wall section is larger,and the reinforcement effect is worse.When the shear wall is replaced in five batches,the safety of the shear wall construction process is higher.When the replacement batch is unchanged,it can be obtained by finite element simulation comparison.When the width of the wall segment is divided into0.4m,0.5m,0.5m,0.6m,and the stress difference of each replacement wall segment can be effectively reduced.Improve the overall performance of the shear wall.