Analysis of material non-linearity of steel girders subjected to patch loading

Subject review The paper presents an analysis of behaviour of plate girders (welded steel I girders) under patch loading. Concentrated or uniformly distributed loading on a short length of the flange, and in the plane of web is known as patch loading. Behaviour of the girder in non-linear area, as well as the ultimate load capacity, which is manifested by buckling in the loaded zone were analysed. Girder modelling was performed in ANSYS Workbench 15 software [1]. In accordance with the standing regulations EN 1993-1-5 [2] and BSK 07 [3], in the course of the numerical analysis, six different material models were employed. The obtained results were compared to the experimentally obtained results. Keywords: material nonlinearity; patch loading; steel girders; ultimate load capacity Analiza nelinearnosti materijala limenih nosaca podvrgnutih lokalnom opterecenju Pregledni clanak U radu se daje analiza ponasanja limenih nosaca (nosaci od zavarenog celika I) pod lokalnim opterecenjem. Koncentrirano ili jednoliko rasporedeno opterecenje na maloj udaljenosti od prirubnice i u ravnini mreze, poznato je kao lokalno opterecenje (patch loading). Analiziralo se ponasanje nosaca u nelinearnom podrucju kao i ucinak kriticnog opterecenja, koji se manifestira izvijanjem. Za modeliranje nosaca primijenjen je softver ANSYS Workbench 15 [1]. U skladu s vazecim propisima EN 1993-1-5 [2] i BSK 07 [3], tijekom numericke analize koristeno je sest razlicitih modela materijala. Dobiveni rezultati usporedeni su s eksperimentalno dobivenim rezultatima. Kljucne rijeci: limeni nosaci; lokalno opterecenje; nelinearnost materiala; ucinak kriticnog opterecenja