The Impact of the Cracks on the Harmonic Response of Stiffened Steel Plates

Abstract

Stiffened plates are employed in various engineering structures including aerospace, civil, naval, etc. These structures may be subjected to harmonic loads. Therefore, it is essential to understand the harmonic response of a cracked stiffened structure. This study presents the effects of the crack location on the free vibration and harmonic response of the stiffened plates. For this purpose, horizontal and vertical cracks are modelled throughout the fixed from two-side structure. The analyses are performed via the Finite Element Method and the Mode Superposition technique. The natural frequencies and the displacement responses of the cracked and healthy structures are obtained and interpreted. It is concluded that a horizontal crack can decrease the third natural frequency by 60% as it is located in the center of the stiffened plate that is fixed from its nonstiffened edges. Thus, the displacement response of the stiffened structures is increased by 18% in the presence of the side horizontal or vertical cracks, which are located at the free ends of the stiffened structures no matter which boundary condition is considered.

Ultimate Bending Strength Evaluation of MVFT Composite Girder by using Finite Element Method and Machine Learning Regressors

“…In addition, there are some findings on new type of composite girders, such as the post-installed shear connector aiming to strengthen composite bridge (Hällmark et al, 2019), bending capacity of U-shaped steel-concrete composite girders (Zhou et al, 2019) and straight-side U-shaped steel-encased concrete composite girders (Yan et al, 2021). Besides, some researchers have performed the dynamic analysis of the plate structure by using FE method (Das and Gonenli, 2022;Gonenli and Das, 2021;Das et al, 2020;Sahoo and Barik, 2020;Jafarpour and Khedmati, 2020).…”

Post-buckling failure analysis of composite stiffened panels considering the mode III fracture

“…Ye et al 17 predicted the post-buckling behavior of interface with different bonding technologies and the impacts of the stiffener–skin energy and strength on the post-buckling response. Gonenli 18,19 and Das 20 studied the crack behavior in curved, flat and stiffened plates. These researchers did not consider the mode III fracture in their analysis of the debonding process and treated mode III as mode II with simplifications, partially owing to the fact that there has been a lack of measurement methods for the mode III fracture toughness, and there are no unified test standards.…”