The difference between JGJ95-20 1 1 Technical specification for cold-rolled ribbed reinforced concrete structures and JGJ95-2003.

Compared with JGJ95-20 1 1 Technical Specification for Cold Rolled Ribbed Reinforced Concrete Structures, it has the following modifications: (1) High ductility cold rolled ribbed steel bars are jointly developed by Anyang; The application scope of cold-rolled ribbed steel bars is standardized; The strength design value of cold-rolled ribbed steel bar is corrected; The relevant regulations on the design of normal use limit state are revised; The relevant regulations on the thickness of protective layer, anchorage length and minimum reinforcement ratio of steel bars have been adjusted. The weight deviation check item has been added to the reinforcement method.

JGJ95-20 1 1- Technical Specification for Cold Rolled Ribbed Reinforced Concrete Structures The high ductility cold rolled ribbed bars developed by Anyang Heli High Speed Cold Rolling were incorporated into the construction technical specification, which made a qualitative change in the technical specification. First of all, the tensile strength is increased from 550Mpa to 600Mpa, which means that the building safety factor is improved and steel can be saved. Secondly, the elongation is increased by 50%, especially the maximum uniform elongation is increased by 1.5 times, which greatly improves the ductility and seismic performance of steel bars, effectively prevents brittle fracture of steel bars and ensures seismic safety. Thirdly, the strength design value is increased from 360Mpa to 4 15 MPa, which expands the application range of high ductility cold-rolled steel bars, not only for cast-in-place floor slabs, but also for shear walls, and large specifications can be applied to ring beams. According to experts' calculation, the increase of strength design value shows that each ton of high ductility cold-rolled ribbed steel bar can save about 150 kg of steel compared with grade III steel. Fourthly, the improvement of the strength, ductility and design value of high ductility steel bars indicates the improvement of the application of cold-rolled ribbed steel bars, which is conducive to promoting the upgrading of cold-rolled ribbed steel bars.

I also found it on China cold-rolled ribbed steel bar information network. You can check it on the website for details.