Wyniki wyszukiwania - BazTech

1

Mathematical modelling of stress-strain state of steel-concrete beams with combined reinforcemenent

Selejdak Jacek, Bobalo Taras, Blikharskyy Yaroslav, Dankevych Iryna

Production Engineering Archives

|

2023

|

Vol. 29, Iss. 1

108--115

EN

Most of the modern computer software for the building structures` calculation is based on mathematical dependencies which make it possible to analyse rather complex stress-strain state of structures subjected to loading. As a rule, the calculation is based on the finite element method and is reduced to the calculation of deformations arising in structures due to the action of external forces with the use of real strain diagrams of materials, σ-ε diagrams for concrete and reinforcement. Modern normative regulations for reinforced concrete structures` calculation are also based on the deformation model using material deformation diagrams, which are as close to the real ones, as possible. Therefore, this study was aimed to investigate in more detail the stress-strain state and the physical essence of the processes occurring in reinforced concrete structures with combined reinforcement according to mathematical approaches and regulations of DBN B.2.6-98:2009 and DSTU B. In 2.6-156:2010. Namely, in the research is analysed the combined reinforcement of S245 steel tapes and A1000 rebar, which is used in the production of reinforced concrete elements. The results of mathematical modelling were compared with the calculation results, according to DBN B.2.6-98: 2009 and DSTU B. B 2.6-156:2010, as well as with field experimental data. Therefore, the conclusion could be made, whether it is possible to use this technique with sufficient accuracy to calculate reinforced concrete structures with combined reinforcement.

2

Metoda badania belki zginanej wykonanej z drewna klejonego ze zbrojeniem mieszanym

Sobczak-Piąstka Justyna, Gomon Svyatoslav S., Polishchuk Mykola, Homon Sviatoslav, Gomon Petro, Karavan Victor

Materiały Budowlane

|

2021

|

nr 11

28--30

PL

Konstrukcje z drewna klejonego warstwowo wykazują wiele zalet, m.in. małą masę, dużą odporność na działanie środowiska agresywnego chemicznie, dużą ognioodporność oraz są estetyczne i przyjazne dla środowiska. Mimo to naukowcy nadal poszukują nowych sposobów na poprawę właściwości drewna. W artykule zaproponowano metodę zbrojenia belek klejonych polegającą na umieszczeniu prętów stalowych w strefie ściskanej, a w strefie rozciąganej zbrojenia wykonanego z wykorzystaniem zewnętrznej taśmy kompozytowej z włókna węglowego. Celem artykułu jest opracowanie i przedstawienie dokładnej metody badania tego typu konstrukcji.

EN

Structures of glued wood have significant advantages among others less mass, better resistance to the action of chemically aggressive environments, high fire resistance, aesthetic attractiveness, eco-friendliness. Despite that scientists are looking for new ways to improve the characteristics of such wood. In this article proposed a method of combined reinforcement of glued beams in which the steel bar reinforcement was arranged in the grooves of the compressed zone, and in the stretched zone reinforcement was carried out with the external composite tape made of carbon fiber. The aim of the article is the method of experimental research on the transverse bend of a construction of glued beams with combined reinforcement was developed.

3

Determination of the optimum percentage of high strength bars in RC beams with combined reinforcement using FEM

Selejdak Jacek, Blikharskyy Yaroslav, Bobalo Taras, Kopiika Nadiia

System Safety : Human - Technical Facility - Environment

|

2020

|

Vol. 2, nr 1

230--236

EN

In this work on the basis of the developed and tested mathematical model, the numerical experiment is conducted in order to study in more detail the specifics of performance of concrete beams` with combined reinforcement. For this purpose nine series of reinforced concrete beams with different combination of steel bars (A400C, At800, A1000) and ribbon reinforcement (C275) were modeled. In the developed series two classes of concrete were used: C50/60, C35/45. The functions derived on the basis of mathematical modeling allow us to determine the recommended percentage of high-strength reinforcement of common reinforced concrete structures with single reinforcement. Therefore, the possibility is obtained to reduce the total structures` reinforcement percentage, increasing their deformability by the specified value without affecting the bearing capacity.