Abstract
Base plate is a critical structural component responsible for transferring loads from the structure to the foundation. By increasing the contact surface between the column foot and the foundation, base plates contribute to more manageable distribution of column forces and the resulting stresses in the substructure. The off-center positioning of column on the base plate, which is sometimes unavoidable because of the limitations imposed by elevator shaft, adjacent buildings, etc. could be a major design issue. This paper investigates the effects of column eccentricity on the design and stress distribution of base plates and the impact of stiffeners on the thickness of these plates. In this investigation, a comparison is made between the superposition method and the finite element method in terms of their evaluation of stress levels under the base plate with column eccentricity. The study also aims to determine the magnitude and distribution of maximum stresses with plate’s thickness and dimensions and column’s position on the plate taken into account. The results show that the superposition method can be confidently used in the force analysis and design of base plates with column eccentricity under bidirectional moments.
Highlights
Base plates are the structural components responsible for the transfer of loads from columns to the foundation
This study reported that using a greater number of bolts results in more uniform stress distribution and reduced plate rotation, and using thicker stiffeners and plates significantly improves the performance of the system as a whole [16]
This paper presented a method based on the superposition theory for the design of columns with eccentricity relative to the plate’s center under bidirectional moments
Summary
Base plates are the structural components responsible for the transfer of loads from columns to the foundation. In 1998, Jaspart and Vandegans used a series of experimental models to investigate the behavior of anchor bolts with end-hooks in the base plate connections They observed that the contact and bond between the anchor bolt and the foundation concrete can disappear, in large or earthquake-induced displacements and deformations. In a study by Silviu et al (2015) on the behavior of steel base plate connections under cyclic loading, they reported an agreement between ultimate strength values obtained from numerical and experimental models and observed that reducing the plate stiffness causes the base plate connection to exhibit a semi-rigid behavior and this behavior makes the base plate more ductile [15]. The effects of stiffeners on the stress magnitude and distribution, cracking, uplift, and behavior of these base plates were examined
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