T/CECS 252-2019 Active Group standards

T/CECS 252-2019 After fire, engineering structure identification standards

Publish Date: 2019-11-08 Implement Date: 2020-04-01 For services related to genuine standard inquiry, procurement, translation, and other related services in China, please Contact Us

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Basic Information

Standard Code: T/CECS 252-2019

Standard Type: Group standards

Standard Status: Active

is_force_gb: no

CCS Name: Fire fighting

ICS Name: The comprehensive construction industry

Publish Date: 2019-11-08

Implement Date: 2020-04-01

Scope

Main technical content: The main technical content of this revision is as follows: 1. Expanding the scope of application of this standard to include the assessment of engineering structures after fire, with additional structural types such as prestressed reinforced concrete structures, wooden structures, and steel-concrete composite structures; 2. Adjusting the grading standards for preliminary and detailed assessments; 3. Adding methods for inferring the surface temperature of masonry structural components after fire; 4. Adding assessment and grading content for prestressed concrete structures, wooden structures, and steel-concrete composite structures after fire, while adjusting some existing assessment and grading content for structural components; 5. Adding strength reduction coefficients for high-strength concrete and high-strength reinforcing steel after high-temperature cooling; 6. Adjusting the elastic modulus of concrete and the reduction coefficient for reinforcing steel-concrete bond strength after high-temperature cooling; 7. Adding methods for testing the residual stress of prestressed steel strands after fire; 8. Adding strength reduction coefficients for prestressed steel wires and steel strands after high-temperature cooling; 9. Adjusting the reduction coefficient for the yield strength of steel in steel structures after high-temperature cooling, and adding reduction coefficients for the yield strength of high-strength bolts and welds after high-temperature cooling; 10. Adding reduction coefficients for the pre-tension of high-strength bolts after high-temperature cooling. This standard is divided into 7 chapters and 9 appendices, with main technical content including: General Provisions, Terms and Symbols, Basic Requirements, Investigation and Testing, Post-fire Structural Analysis and Component Verification, Assessment and Grading of Structural Components after Fire, and Assessment Reports, etc.