\"Code for Blast Resistance Design of Petrochemical Buildings\" (GB/T50779-2022)

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\"Standard for Blast Resistance Design of Petrochemical Buildings\" (GB/T 50779-2022) came into effect on December 1, 2022; the previous standard, \"Code for Blast Resistance Design of Petrochemical Control Rooms\" (GB 50779-2012), was simultaneously repealed. The new standard applies to the blast resistance design of petrochemical buildings that are newly constructed, expanded, or renovated. 1. The scope of blast resistance design has been expanded, with it being changed from blast resistance design for petrochemical control rooms to blast resistance design for petrochemical buildings ； 2. Revised and added requirements regarding the plan layout of blast-resistant buildings, as well as the number of floors and height of such buildings ； 3. Added the selection principles for structural forms of blast-resistant buildings under different blast loads, as well as the blast resistance design requirements for masonry and steel structure buildings ； 4. The peak incident overpressure of the explosive shock wave and the corresponding positive pressure duration specified in the original standards have been removed; it is now specified that the overpressure caused by the explosive shock wave shall be determined through an explosion safety assessment ； 5. Revised and supplemented the content related to the calculation of explosive loads as well as the performance requirements for blast-resistant buildings ； 6. Modifications and additions have been made to the structural and deformation requirements for reinforced concrete members, reinforced masonry members, and steel structure members, as well as to the calculations related to the dynamic strength of materials, the strength and dynamic enhancement factors, and the requirements for the design stress values of rebar ； 7. Modified and supplemented the calculations for the ductility ratio of components and the average inertial moment of component cross-sections ； 8. Added the in-plane and out-of-plane calculation requirements for components such as roof panels and side walls, as well as the checking requirements for the shear capacity of reinforced concrete components and reinforced masonry components, along with the calculation methods for their direct shear capacity ； 9. The equivalent static load method was removed, and content on using closed-form solutions for the dynamic analysis of components was added ； 10. Chapter 8 “Explosion Resistance Design of Existing Buildings” has been added” ； 11. Added design requirements for fire rescue in blast-resistant buildings, regulations regarding the start-up and shutdown of ventilation and air conditioning equipment under normal and abnormal conditions, performance requirements for blast-resistant valves and electrically operated shut-off valves, as well as regulations on the height of fresh air intake vents. This standard is under the jurisdiction of the Ministry of Housing and Urban-Rural Development.