Summary： Code for Design of Strengthening Concrete Structure

On May 23rd, the first working conference on the revision and compilation of the national standard "Code for Design of Strengthening Concrete Structure" was held at Sichuan Academy of Building Sciences Co., Ltd. Leaders from the Sichuan Provincial Department of Housing and Urban Rural Development, relevant departments of the Ministry of Housing and Urban Rural Development, and the Standardization Committee attended the meeting and delivered speeches. At the meeting, the preparation team conducted in-depth discussions on the draft of the standard revision outline and core technical issues, and clarified the follow-up work schedule and task division. Shanghai Horse Construction Technology Co., Ltd. attended the conference as a participating unit.

Background of standard revision

China's construction industry is gradually shifting from "incremental expansion" to "stock optimization"

>>Policy orientation

The Proposal of the Central Committee of the Communist Party of China on Formulating the 14th Five Year Plan for National Economic and Social Development and the Long Range Objectives Through the Year 2035 in 2020 clearly proposes to implement urban renewal actions, strengthen the transformation of old urban residential areas and community construction. In 2021, the Ministry of Housing and Urban Rural Development put forward the relevant requirements of "insisting on retaining as much as possible and making every effort to preserve urban memory" in the "Notice on Preventing Large scale Demolition and Construction Issues in Implementing Urban Renewal Actions (Draft for Comments)". The 2024 National Conference on Housing and Urban Rural Development emphasizes the vigorous implementation of urban renewal.

>>The inevitable choice under the dual carbon target

Structural reinforcement, as the core means of "preventing large-scale demolition and construction" in urban renewal, is not only an important measure to implement the "dual carbon" strategy and build a resource-saving society, but also a necessary way to protect the historical and cultural heritage of architecture.

According to the results of the first national comprehensive natural disaster risk survey, there are about 354 million urban and rural houses in China, with an area of over 120 billion square meters. A large number of existing buildings are facing problems such as expiration of service life, failure to meet performance standards, accumulation of natural disaster damage, and insufficient management and maintenance, and the demand for maintenance and reinforcement is becoming increasingly urgent. Among them, concrete structures have a particularly prominent demand for reinforcement due to their widest application and largest stock.

The necessity of standard revision

The first edition of the national standard "Code for Design of Strengthening Concrete Structure" was implemented in November 2006, and the second edition "Code for Design of Concrete Structure Reinforcement" GB50367-2013 was released on November 1, 2013 and implemented on June 1, 2014. The technical content of the standard is reasonable and highly operable. The implementation of the standard provides technical support for the reinforcement design of concrete structures and plays an important role in the reinforcement and renovation projects of concrete structures in China. But in recent years, industry development has put forward new requirements for standards:

>>Standardization system coordination

In recent years, the mandatory engineering standards "General Specification for Appraisal and Reinforcement of Existing Buildings" and "General Specification for Concrete Structures" have been released and implemented, and the "Design Standard for Concrete Structures (2024 Edition)" has also been revised. It is necessary to optimize this standard simultaneously to achieve matching connection.

>>Technical content iteration

In the 2013 version of the standard, there are individual parameters that need to be adjusted, and new reinforcement materials and their supporting reinforcement methods have matured and need to be included in this standard to meet the needs of engineering innovation and further meet the needs of engineering practice.

Develop team and technical foundation

This standard revision is led by Sichuan Academy of Building Sciences Co., Ltd., with the participation of Shanghai Horse Construction Technology Co., Ltd., Tongji University, Hunan University, Wuhan University, Tsinghua University, Southeast University, Wuhan University of Technology, Shandong Academy of Building Sciences Co., Ltd., Chongqing Academy of Building Sciences Co., Ltd., Shanghai Academy of Building Sciences Co., Ltd., and others. The participating units cover the entire industry chain of materials, design, construction, testing, appraisal, and reinforcement. The drafting experts have long been engaged in the inspection, appraisal, reinforcement and renovation of existing buildings, as well as material research and development. They have a profound theoretical foundation and rich engineering practice experience, and have deeply participated in standardization reform work, laying a solid foundation for standard revision.

Next, the preparation team will systematically promote the revision of standards according to the division of labor and progress determined at the meeting, striving to further enhance the safety, economy, and applicability of concrete structure reinforcement through technological upgrades, and provide stronger technical support for urban renewal and sustainable development of buildings.