Introduction. This paper analyzes the results of previously conducted experimental studies on a precast reinforced concrete frame according to Patent No. 132814 "Precast Reinforced Concrete Frame." To analyze the provisions governing the behavior of prestressed elements in the Russian Building Code SP 63.13330.2018 "Concrete and Reinforced Concrete Structures," the authors employ the results of full-scale destructive testing and numerical experiments in relation to the considered analytical methodology.

Aim. The validate the analytical methodology described in clauses 8.2.1 – 8.2.31, 9.1.1– 9.3.11 of the code of rules SP 63.13330.2018 against the results obtained through full-scale and numerical methods, taking into account the low cross-sectional height of the elements and the application of prestress to the reinforcement.

Materials and methods. Based on the results of a previously conducted full-scale destructive test, the authors perform numerical and analytical investigations into the stiffness of the tested structures. The results of the numerical analysis, carried out using the "LIRA-SAPR 2022" software complex, serve as evidential support for the conducted experiment.

Results. The analysis of the analytical methodology for determining the deformation properties of floor elements, performed by the authors, allows for proposing a number of hypotheses regarding the behavior of floor elements with a horizontally oriented cross-section and prestressed reinforcement.

Conclusions. The authors put forward hypotheses concerning the manner in which the analytical methodology, which is the subject of this research, accounts for the behavior of the elements under consideration.

Introduction. The article discusses new portal designs for which Russian patents for utility models have been obtained: № 230318, № 230921, № 230898, № 231705. To determine their actual bearing capacity and deformability, the authors propose a method for their experimental tests and a test bench.

Aim. The aim of the study is to develop new designs of portal structures and testing methods that allow for close-to-real loading, while reducing labor intensity and ensuring the required safety.

Materials and methods. A special stand has been developed for testing portal structures, which provides for horizontal installation and loading through mounting blocks installed both on the portal and on supports on the power floor.

Results.

The developed method of testing portal structures makes it possible to ensure their lateral stability with special elements, apply a close real load and install measuring instruments to determine the strain stress in the section.

Conclusions.

1. The authors have proposed four new technical solutions for portal structures, for which patents of the Russian Federation for utility models have been obtained: № 230318, № 230921, № 230898, № 231705.

2. As a result of the conducted research, a test procedure for triangular and combined portal structures has been developed and substantiated, which makes it possible to obtain reliable data on their strength characteristics and bearing capacity.

In 2019, scientific journal “ACADEMIA. ARCHITECTURE AND CONSTRUCTION” published an article «Dynamic coefficients or response spectra of structures to earthquake ?» by E.N. Kurbatskiy and V.L. Mondrus [10]. The authors claim about necessity of normative documentation updating for seismic resistance estimation in terms of replacing the initial effects assignment through the dynamics coefficients graphs with the response spectra.

Inspired by the work of Kurbatskiy E.N. and Mondrus V.L., the authors proposed a number of improvements that will help eliminate the current inconsistency with modern knowledge in seismology and the current level of development of dynamic methods for seismic resistance estimation.