Experts answered popular questions about JV 63.13330.2018 and JV 28.13330.2017

100+ TechnoBuild and JSC SIC Stroitelstvo held a joint webinar on JV 63.13330.2018 "Concrete and reinforced concrete structures" and JV 28.13330.2017 "Protection of building structures from corrosion". The speakers were representatives of the A.A. Gvozdev National Research Institute. The feedback from the audience turned out to be the largest in the history of the 100+ webinars: participants asked dozens of questions, some of the answers to which had to be transferred to written form due to time constraints.

Head of the Laboratory of Corrosion and Durability of concrete and reinforced concrete structures, Doctor of Technical Sciences, Professor Valentina Stepanova, speaking about the joint venture on 28.13330.2017, recalled that the vault will be used both for newly erected buildings and structures, and for those in operation. In the new edition, which replaced the document from 2012, many important clarifications were made, including the requirements for assigning maximum allowable crack widths, new types and classes of reinforcing steel, requirements for assessing the aggressiveness of chlorides, and others. In addition, contradictions with fire-technical requirements have been eliminated.

Valentina Stepanova elaborated on several topics:

• protection measures for reinforced concrete structures;
• general provisions of the joint venture;
• the degree of aggressive media exposure;
• choosing a protection method;
• requirements for materials and structures;
• fittings.

Sergey Zenin, Head of the Laboratory of Theory of Reinforced Concrete and Structural Systems, Ph.D., spoke about the practice of using SP 63.13330.2018 in the "Frequently Asked Questions/Answers" format. In particular, he provided explanations on the following topics:

• determination of the standard values of the resistance of transverse reinforcement to tension R sw,n and reinforcement to compression R sc,n (special effects, progressive collapse);
• application of the coefficients of working conditions Yb2 and Yb3 (design and verification calculations) for the calculated compressive strength of concrete (clause 6.1.12);
• calculation of the flat selected plate element for the action of transverse forces (clause 8.1.55);
• structural reinforcement of the ends of the plates with U-shaped clamps (clauses 10.4.9 and 10.4.14). Part 1;
• transverse reinforcement of non-centrally compressed elements (clause 10.3.15);
• correct determination of the bypass length (overlap) of reinforcing bars (clause 10.3.30) and others.

The video of the webinar can be viewed on YouTube. The presentations of the speakers are saved via the link. There you can also find answers to questions that the speakers did not have time to give directly during the webinar.