Abstract
Pinned base plate connections are the most common base connection used in low-rise steel buildings. In this research, an extensive parametric study is performed using the Finite Element (FE) software Abaqus to determine the elastic rotational stiffness, moment resistance, and energy absorption of the pinned base plate connection connected to a reinforced concrete footing and subjected to an eccentric axial load. The developed FE model is validated using experimental results from the literature. Moreover, an intensive parametric study is conducted to understand the behavior of these connections better. The investigated parameters include the base plate thickness, anchor bolt diameter, and arrangement and number of bolts. The most effective parameters that affect the elastic rotational stiffness and moment resistance of pinned base connections are the anchor bolt arrangement and diameter. The maximum increase in the rotational stiffness was 53% for the anchor bolt diameter of 30 mm when the base plate thickness increased from 12 mm to 30 mm. Based on the base plate thickness, the moment resistance is improved by 150–260% when the bolt diameter increases from 12 mm to 30 mm.
Highlights
Low- and medium-rise steel structures are widely used all over the world as industrial buildings, stores, schools, markets, and warehouses
On the other hand, using semi-rigid base plate connections as pinned connections by neglecting their rotational stiffness leads to larger lateral drifts than the actual values
The semi-rigid base plate connections should be defined with the actual rotational stiffness
Summary
Low- and medium-rise steel structures are widely used all over the world as industrial buildings, stores, schools, markets, and warehouses. The rotational stiffness of the pinned and semi-rigid base plate connections is ignored in single-story low-rise buildings [1] The prediction of this rotational stiffness is more complicated due to various factors such as the bond between the anchor bolts and concrete base, the stress concentration on concrete under the compression flanges of columns, and the behavior of the grout bed under the steel base plate. A FE model was developed using the numerical software Abaqus, 2017 [20], to s2i.m1.uGlaetoemaetcraynotfilCeovleurmsntesel column with a steel base plate connection tested by Gomez et al [21T]h. Component Interaction and Contact The three main components of the connection (steel column, reinforced concrete base, and anchor bolt) were assembled by defining the contact surface properties between them.
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