Parametric Analysis and Stiffness Investigation of Extended End-Plate Connection

Abstract

Extended end-plate (EP) bolted connections are widely used in steel structures as moment-resisting connections. Most of these connections are semi-rigid or in other words flexible. The paper aims to study the behavior of such connections under the effect of column top-side cyclic loading using the finite element (FE) method. For semi-rigid connections, it is very vital to determine the moment-rotation relationship as well as the connection stiffness. These beam-column connections have been parametrically studied, the effect of joint type, shear forces, diameter of bolt, thickness of end-plate, and end-plate style were studied. Parametric studies show that the panel zone shear force is the key factor and has a significant effect on the connection stiffness. Finally, based on the component method, the stiffness of the bending component is improved, and the initial stiffness calculation model of the connection under column top-side cyclic loadings is established. The results show that the calculation model is in good agreement with the finite element analyses, and this proves that the calculation model proposed in this study could act as a reference method.

Экспериментальные Исследования Влияния Зазоров Во Фланцевых Соединениях На Напряженно-Деформированное Состояние Узла

“…В ряде научных публикаций представлены результаты исследований фланцевых узлов с учетом их жесткостных параметров [10][11][12][13][14][15][16][17][18][19][20]. Для определения жесткостных характеристик используются результаты расчетов конечно-элементных моделей и данные экспериментальных исследований.…”

Numerical Behavior of Extended End-Plate Bolted Connection under Monotonic Loading

“…In their research, Luo et al [21] constructed a finite element numerical model to investigate the behavior of an extended end-plate bolted connection subjected to cyclic loading from the column's top side. Through a parametric study, they found that the panel zone shear force plays a crucial role and significantly impacts the connection's stiffness.…”

Analytical Model for the Fatigue Analysis of Steel Joints by Clamps According to the Lever Length

“…Therefore, it is necessary to assess the fatigue behaviour of this type of joint, especially depending on the features that determine its operation (the lever lengths). There are numerous research papers on the behaviour of classic bolted connections [10][11][12][13][14][15][16][17], many of them focused on fatigue. For example, Zampieri et al [18] carried out a review of the fatigue resistance of bolted shear connections, Bartsch et al [19] performed an analysis of the fatigue strength of end plate connections with prestressed bolts, and Liu et al [20] showed a simplified modelling strategy based on continuous damage mechanics for the evaluation of cumulative fatigue damage in metal bolted joints.…”