JGJ 92-2004 Technical Specification for Unbonded Prestressed Concrete Structures China National Industry Standard

Author: Ministry of Construction of the People's Republic of China
Publisher:
Publish Date: 2005-04-01
Features: The main technical content of this code includes: 1. General Provisions; 2. Terms and Symbols; 3. Materials and Anchor Systems; 4. Basic Provisions for Design and Construction; 5. Design Calculations and Details; 6. Construction and Acceptance; 7. Appendices A～D. The revised content mainly includes: 1. Improvements to the materials and anchor systems, advocating the use of unbonded prestressing tendons made of steel strands, canceling unbonded prestressing tendons made of parallel steel wires, adding jointed plate anchor systems and their selection principles and structural requirements, and canceling swaged anchor systems; 2. Clarifying the crack control level and providing formulas for crack width and stiffness calculations; 4. Selection range of span-to-depth ratios for various structures under high-speed common loads; 5. Adjusting the calculation formula for the design stress value of unbonded prestressing tendons; 6. Improvements to the calculation of prestressing losses; 7. Adding the calculation of equivalent column stiffness considering torsional effects in slab-column structure calculations; 8. Adding the calculation and structural requirements for the shear resistance of anchor bolts; 9. Requirements for openings in flat slabs and ribbed slabs, strengthening measures at openings, and calculation rules for the critical section perimeter when columns have openings or are adjacent to free edges; 10. Using nominal tensile stress to estimate the quantity of prestressing tendons; 11. Design and construction of externally prestressed concrete beams and their corrosion protection systems; 12. Improving and refining the construction technology of unbonded prestressed concrete, and specifying technical measures for the durability of unbonded prestressed concrete structures. The anchor systems of unbonded prestressing tendons are divided into general corrosion protection and fully enclosed corrosion protection based on environmental categories, with technical indicators specified for fully enclosed corrosion protection systems.
Table of Contents:
1. General Provisions
2. Terms and Symbols
3. Materials and Anchor Systems
4. Basic Provisions for Design and Construction
5. Design Calculations and Details
6. Construction and Acceptance
Appendix A: Estimation of Unbonded Prestressing Tendon Quantity
Appendix B: Prestressing Losses of Common Strands of Unbonded Prestressing Tendons
Appendix C: Calculation of Equivalent Column Stiffness and Equivalent Frame Calculation Model
Appendix D: Tension Record Table for Unbonded Prestressing Tendons