Романюк, В. В. та Супрунюк, В. В. та Безнюк, Л. І. та Romaniuk, V. V. та Supruniuk, V. V. та Bezniuk, L. I. (2021) НАПРУЖЕНО-ДЕФОРМОВАНИЙ СТАН НЕРОЗРІЗНИХ ПЕРФОРОВАНИХ БАЛОК БІЛЯ ПРОМІЖНИХ ОПОР. Вісник Національного університету водного господарства та природокористування (1(93)). с. 405-416.

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Анотація

Виконано моделювання нерозрізної двопрольотної перфорованої балки методом скінчених елементів у програмному комплексі «Ліра» за різного конструктивного оформлення зони балки поблизу проміжної опори. Розглянуто варіанти з використанням або без використання ребра жорсткості, розміщеного по осі проміжної опори, а такожі з незавареними чи завареними отворами у стінці зліва і справа від опори. Отримано дані про напружено-деформований стан нерозрізної перфорованої балки та наведено основні результати проведених досліджень.

Title in English

TENSIONALLY DEFORMED STATE OF INSEPARABLE PERFORATED BEAMS NEAR INTERMEDIATE SUPPORTS

English abstract

The purpose of the research is formulated, which is the need to study the stress-strain state of inseparable perforated beams of the Ibeam profile in the areas near the intermediate supports with their different design in the software complex "Lira". The objectives of the study are to establish the actual values of stresses and strains in the characteristic cross-sections of the inseparable perforated beam of the I-beam profile, which occur on the intermediate supports; performing a comparative analysis of the results of numerical studies obtained in the software complex "Lira" for the intermediate support node for different variants of its design and elucidation of the influence of the design of the beam in the area of intermediate support on the stress-strain state of the calculated sections. The geometric dimensions of the experimental perforated beam are accepted on the basis of recommendations for the choice of rational parameters of the section of the wall of the original profiles. Using the known formulas for determining the values of transverse forces and bending moments at characteristic points and cross sections along the length of a two-span inseparable beam under the action of a uniformly distributed load, the magnitude of the load is determined, for the application of which in the beam there is a limit state belonging to the limit states of the 1st group. Modeling of an inseparable two-span perforated beam by the finite element method in the software complex "Lira" with different structural design of the beam zone near the intermediate support is performed. Variants with or without the use of a stiffening rib placed along the axis of the intermediate support, as well as with unwelded or welded holes in the wall to the left and right of the support are considered. Data on the stress-strain state of an inseparable perforated beam near the intermediate support are obtained and the main results of the research are given. The use of transverse stiffeners, including on the support, for such beams is not fully regulated, as the current design standards allow only to design the geometric parameters of such ribs, but do not give specific instructions on the location of these elements along the length of the beams. It is concluded that there is no comprehensive method of calculating inseparable perforated beams in areas near intermediate supports, which is a deterrent to their wider application.

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