Modeli loma čeličnih grednih nosača sa otvorima u rebru

Abstract

As an alternative to trusses and open-web joist systems, beams with web openings are lightweight, long-spanning structural elements that bind structural role (efficient load distribution) and functionality in a visually acceptable way by allowing service routes to be installed within their cross-section height. Due to the presence of web openings, load transfer is accompanied by complex stress distributions in the section web, causing failure modes that are distinguishable from those of solid I-section beams. This paper summarizes the different failure modes of the beams with web openings that have been discovered and confirmed in numerous experiments of reference scientific researches. Based on the state-of-the art in this structural area, the predictions of different failure modes that are affected by influencing geometric parameters are provided.Prisustvo otvora u rebrima nosača prouzrokuje složenu raspodelu napona i posledično modele loma koji se značajno razlikuju od onih kod tradicionalnih čeličnih grednih elemenata. Shodno tome, mnoge studije su se bavile ovim problemom kroz eksperimentalna ispitivanja i numeričku analizu. Ovaj rad rezimira sprovedena istraživanja o različitim modelima loma ovih nosača. Na osnovu dostupne literature, formirana je baza sa više od stotinu eksperimentalnih i numeričkih primera, što je dalje omogućilo bolje sagledavanje zaključaka pojedinih autora. Na osnovu pomenute baze, data su predviđanja očekivanih modela loma na osnovu različitih odnosa geometrijskih parametara