Scientists presented the latest developments in the field of design and calculation of steel structures

In preparation for the International Construction Forum and the 100+ TechnoBuild exhibition, the organizers held the first joint webinar with the Central Research Institute named after V.A. Kucherenko (JSC SIC Stroitelstvo), dedicated to the latest developments in the field of design and calculation of steel structures. More than 200 people joined him.

The meeting was opened by Dmitry Solovyov, Head of the Laboratory of Large-span Metal Structures and Certification at OMK V.A.Kucherenko Central Research Institute, PhD. He spoke about the design experience and regulatory requirements for ensuring the resistance of steel structures to progressive collapse, including identifying current problems.

Thus, in the domestic regulatory framework, in particular, in the Federal Law "On Technical Regulation" 184-FZ, GOST 27751-2014 and others, the basis is laid for the possibility of the risk of failure of building structures, while there is no methodology for assessing such a risk. In order to form a complete and developed system of regulatory documents on the management and assessment of the risk of an accident of building structures, such a regulatory methodology should be developed and implemented.

"To simplify the engineering approach to risk assessment, in some cases it is possible to evaluate the probability and consequences of a negative event not by calculation, but by an expert assessment in points based on the proposed approach," Dmitry Solovyov suggested. "It is necessary to develop not only an alternative method of calculating progressive collapse, but also preventive methods related to ensuring increased bearing capacity of structures, accounting methods, impact prevention, and so on, taking into account international experience in this field."

Pavel Nakhvalnov, a researcher at the V.A. Kucherenko Central Research Institute, presented the topic "The actual bearing capacity of shear-operated bolted joints made of high-strength steels, taking into account tests of multibolt joints." A request for such studies was received from the Association for the Development of Steel Construction due to some limitations in the design of multibolt joints using C390 and C440 steel. For example, section 14a SP16.13330.2017 prohibits the use of precision class B bolts for steel with a yield strength exceeding 375 MPa in multibolt connections. As a result of the research, the experts made several main conclusions.:

The ductility of C390 and C440 steels allows the use of precision class B bolts.;
Reducing the bolt spacing from 3 hole diameters to 2.5 makes no difference in the results of providing the calculated bearing capacity;
The reduction of the interbolt distance from 2.5 hole diameters to 2 for precision class B shear joints can be accounted for by the work factor;
The reduction of the distance to the edge of the element from 2 hole diameters to 1.5 for shear joints of accuracy class B can be taken into account by the coefficient of operation;
It is not recommended to take a specific value for the deformability of multibolt shear joints.

Alexey Krylov, a leading researcher at the V.A. Kucherenko Central Research Institute, spoke about the test results of steel-reinforced concrete structures. The existing structural solutions of the floors have a number of disadvantages. Prefabricated hollow slabs are considered only as a load and are not included in the work of the structure, which leads to increased metal consumption. In addition, a large number of monolithic sections leads to a decrease in the speed of installation of structures. In this regard, the institute conducted tests of the efficiency of saving materials, as a result of which steel beams and precast reinforced concrete are combined in simple ways.

"We can say for the time being that the construction of prefabricated hollow slabs shows a greater load–bearing capacity than we can obtain as a result of calculations, the difference is about 15-20%," said Alexey Krylov. – But before making changes to SP266.1325800.2016, we will conduct an analysis and make additional numerical calculations. We hope that these amendments can be used in the design process next year."

The webinar was completed by Danila Misiuk, a leading engineer for the calculation of metal structures at EVRAZ, who spoke about the automation of the design of steel structures for prefabricated single-storey buildings. According to him, the main problem is that the productivity of the construction industry has not increased over the past 50 years, and the developments that the company is working on will help solve this problem.

You can view the recording of the webinar here.

You can learn more about the latest developments in the field of design and calculation of steel structures at the IX International Construction Forum and the 100+ TechnoBuild Exhibition, which will be held in Yekaterinburg in October 2022.