Кухнюк, О. М. (2024) ЗМІНА ЖОРСТКІСНИХ ВЛАСТИВОСТЕЙ ЗАЛІЗОБЕТОННИХ КОНСТРУКЦІЙ ПРИ ЕКСПЛУАТАЦІЇ БУДІВЕЛЬ ТА СПОРУД В УМОВАХ МАЛОЦИКЛОВИХ НАВАНТАЖЕНЬ. Вісник Національного університету водного господарства та природокористування (3(107)). с. 217-226.

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Анотація

В роботі розглядається один із підходів до опису діаграми стану залізобетонних конструкцій «момент – кривина» за допомогою лінеаризаційних параметрів. При цьому використовується математичний апарат, закріплений в стандартизованих методиках України [9–10]. Особливістю роботи є знаходження, за допомогою запропонованого методу, прогинів при малоциклових навантаженнях залізобетонних елементів.

Title in English

CHANGES IN THE STIFFNESS PROPERTIES OF REINFORCED CONCRETE STRUCTURES DURING THE OPERATION OF BUILDINGS AND STRUCTURES UNDER CONDITIONS OF LOW-CYCLE LOADS

English abstract

The paper considers one of the approaches to the description of the diagram of the state of reinforced concrete structures "moment – curvature" using linearization parameters. At the same time, the mathematical apparatus fixed in the standardized methods of Ukraine is used [9–10]. A feature of the work is finding, using the proposed method, deflections under low-cycle loads of reinforced concrete elements. Modern construction practice continues to use reinforced concrete as a strong and economical material. However, reinforced concrete slabs and beams are subject to permanent deflection under long-term cyclic loading (operating cycles). Their magnitude increases with time, and accordingly, it requires careful monitoring to ensure that the deflections do not reach unfavorable values and that the material is able to withstand the applied load without cracking in the long term. Architects and design engineers take these features into account during design, but questions arise regarding the possibility of predicting deflections during long-term operation in variable conditions that cannot be fully predicted using simple and sufficiently reliable mathematical approaches. Many research works of both domestic and foreign authors were devoted to this topic [1–4; 8]. As indicated in works [5–7], for solving practical problems in the mode of operational one-time loads at levels not exceeding 0.8 from the destructive ones ( Pu ), an easier – linearization approach according to the standardized method [9] works well, which shows good results for different types of loads and combinations of armature saturation. In this work, we will consider the legality of this approach for low- cycle loads, which correspond to the same levels of operational loads, which do not exceed 0.8 of the destructive ones ( Pu ).

Перегляд елементу

Завантажень