Abstract

To promote the development of BIM technology in the field of identification and reinforcement of existing buildings, this paper takes concrete structures as the research object, refers to the current building seismic identification standards, and develops a BIM-based seismic identification system for concrete structures. The research establishes a corresponding data integration platform for the existing concrete frame structure system. Through the secondary development of Revit software, the computer can automatically extract building information and automatically generate a BIM model for seismic identification. The study shows that the program can provide efficient and accurate calculation results in the seismic qualification of concrete frame structures. The seismic test of the concrete structure of the existing building shows that the concrete strength of some components of the building is lower than C20, and the spacing of stirrups in the densified area of some beam components is greater than 100 mm. The seismic structural measures of the building do not meet the requirements. However, the measures and the calculation index follow the relevant regulations. And the calculated values of all programs are highly consistent with the manual calculation results. it can providing a new idea for local earthquake prevention.

Introduction

In China, there are many existing buildings, the new construction area is large every year, and the land area available for real estate development is less and less (Sing, Love, and Liu 2019). As the development of China’s engineering construction moves towards the third stage of maintenance and modernization, the appraisal, reinforcement, and reconstruction of buildings will receive further attention and development (Bong and Rahman 2022). During the long-term use of building structures, due to the natural environment or human factors, material ageing and structural damage will occur, which in turn will affect the durability of the structure and the bearing capacity of components. (Lee, Kim, and Kim 2021). In addition, as people continue to reflect and pay attention to the environment and survival issues, the concept of sustainable development has become more and more popular, and the construction industry must also take a sustainable development path that is in harmony with resources and the natural environment (Santos, Andrade, and Pereira 2019). The construction of new buildings needs to consume a lot of non-renewable resources, and the service life of existing buildings can be extended by employing maintenance and reinforcement, which is in line with the goals of resource protection and the requirements of sustainable development strategies. Repairing and transforming old buildings instead of blindly demolishing them reduces the emission of construction waste and preserves the memory of the city while protecting the ecology

Conclusion

China has many existing buildings, so the research on existing building inspection and appraisal procedures is of great practical significance and has social and economic benefits. Based on ‘Building Seismic Appraisal Standards’ and combined with BIM technology, the research aims to improve the accuracy and efficiency of testing and appraisal, develop the seismic appraisal software for concrete frame structures, and integrate the seismic appraisal software referring to the latest research results of existing building testing and appraisal. The software is adopted in the seismic identification of existing buildings. The research successfully carried out rapid modeling and used the software to check the seismic bearing capacity of the building. During the data collection process, the gap between the design value and the actual value of the frame column reinforcement configuration is between 1mm-9 mm, which meets the relevant error standards, so the data is used in subsequent calculations. Combined with the on-site test data and program identification results, the concrete strength of some components of the building is lower than C20, and the spacing of stirrups in the densified area of some beam components is greater than the minimum value required by the code, so it does not meet the requirements of the ‘Building Seismic Identification Standard’ for the 7-degree zone C in Class building regulations. The seismic bearing capacity of the building can meet the requirements of the relevant codes according to the program calculation results of the control internal force of the components, the ratio of the bearing capacity of each component to the internal force, and the seismic bearing capacity of the building. However, due to the limited time, the software still has many shortcomings. For example, the existing building structures are of various types, and the research is only conducted on the existing concrete frame structure. To realize the automation of the existing building inspection and identification, it is necessary to improve the structure and the type of evaluation object. When conducting seismic analysis, the study did not take into account the reduction in yield strength after corrosion of the reinforcement, and further research and improvement are needed in future studies.