GB 1499.2-2024
Steel for reinforced concrete Part 2: Hot-rolled ribbed steel bars (English Version)
- Standard No.
- GB 1499.2-2024
- Language
- Chinese, English version preview
- Release Date
- 2024
- Published By
- General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
- Latest
- GB 1499.2-2024
- Replace
- GB/T 1499.2-2018
- Introduction
1. Background and significance of standard revision
GB 1499.2-2024 "Hot-rolled ribbed steel bars for reinforced concrete" is the latest standard after GB/T 1499.2-2018. It is a comprehensive revision of the technical requirements, test methods and inspection rules for hot-rolled ribbed steel bars for reinforced concrete. This revision aims to further improve product quality, adapt to the development needs of modern construction technology, and keep pace with international standards.
Main background of standard revision
- Adapt to the development needs of high-performance concrete
- Meet the requirements of earthquake resistance and disaster relief and sustainable development
- Optimize detection methods and improve efficiency
2. Comparative analysis of standard framework
Standard dimensions GB/T 1499.2—2018 GB 1499.2—2024 Main changes Mechanical properties Rm ≤ 630 MPa Rm ≤ 730 MPa (partial grades) Increase tensile strength requirements to meet the needs of high-rise buildings Dimensional deviation Tolerance range±5% Tolerance range±3.5% (large diameter) Optimize tolerance control and improve installation accuracy Fatigue performance requirements No clear requirements Add fatigue performance testing (Appendix A) Add seismic design support Analysis of standard technology evolution
From GB/T 1499.2-2007 to GB/T 1499.2-2018, and then to GB 1499.2-2024, the evolution of steel bar standards reflects the progress of my country's construction technology and the improvement of quality requirements. The new version of the standard has achieved breakthroughs in the following aspects:
- Performance improvement:The characteristic values of tensile strength and yield strength have been further improved to meet the needs of high-rise buildings and large structures.
- Detection optimization:Fatigue performance detection requirements have been added, and the detection methods have been refined.
- Quality control:The characteristic value inspection rules have been introduced to improve the stability of product quality.
3. Implementation suggestions and application cases
Implementation suggestions
To ensure the effective implementation of the new standard, it is recommended that manufacturers and users take the following measures:
- Training:Organize technical personnel to study the new version of the standard, especially the changes in fatigue performance requirements and detection methods.
- Equipment upgrade:Update the detection equipment to ensure that it can meet the new mechanical and fatigue performance requirements.
- Process optimization: Adjust rolling process parameters to ensure that dimensional deviations are within the new standard range.
Application Cases
A large bridge project used hot-rolled ribbed steel bars in accordance with the GB 1499.2-2024 standard. By optimizing the production process and testing procedures, it successfully achieved the goal of a tensile strength of 730 MPa, significantly improving the safety and durability of the bridge structure.
GB 1499.2-2024 history
- 2024 GB 1499.2-2024 Steel for reinforced concrete Part 2: Hot-rolled ribbed steel bars
- 2018 GB/T 1499.2-2018 Steel for the reinforcement of concrete—Part 2:Hot rolled ribbed bars
- 2007 GB/T 1499.2-2007 Steel for the reinforcement of concrete - Part 2: Hot rolled bars
- 1998 GB 1499-1998 Hot rolled ribbed steel bars for the reinforcement of concrete
- 1991 GB 1499-1991 Hot rolled ribbed steel bars for the reinforcement of concrete
- 0000年 GB 1499-1984
GB 1499.2-2024 Steel for reinforced concrete Part 2: Hot-rolled ribbed steel bars has been changed from GB/T 1499.2-2018 Steel for the reinforcement of concrete—Part 2:Hot rolled ribbed bars.