Abstract
Cellular steel beam is flanged steel beam with circular openings of uniform diameter and distance between each opening. The main benefit of such beam is to reduce the structural weight without reducing the strength significantly. A rectangular steel plate with circular opening is frequently used as a model of a web panel of such beam with vertical web stiffeners. The dimension of the plate is the dimension of the web bounded by top and bottom flanges and two adjacent vertical stiffeners. In this research, finite element method is utilized to perform inelastic buckling analyses of rectangular steel plates with circular openings under shear forces along all four edges assuming steel as elastic-perfectly-plastic material with yield stress of 250 MPa. Both nonlinear geometry and nonlinear material are considered in the analyses. The objective of this research is to study buckling behavior of the plate in terms of buckling mode, critical load, and Von Mises (effective) stress distribution. The buckling shear loads of the plates of various length-to-width ratios of the plate (1.0, 1.25, and 1.50) and various opening-diameter-to-plate-width ratios (0.00, 0.05, 0.10, 0.15, 0.20, 0.25, 0.30, 0.35, 0.40, 0.45, 0.50) have been obtained from the analyses. The deformation and Von Mises stress distribution at every load level have been obtained as well from the finite element analyses. Equation to predict inelastic buckling shear force of a rectangular steel plates with circular opening under shear forces is proposed in this study. Verification of the method has been performed by comparing shear buckling loads resulted from finite element analyses with the analytical results in the elastic range.
Highlights
The use of cellular steel beams is frequently inevitable in structural systems because the presence of circular openings in such beams are required for mechanical and electrical systems or to reduce the weight of the structural systems
The peak of each curve is taken as the inelastic buckling shear force
Another observation from the figures is that for any dh/h ratio, the largest buckling shear force is for aspect ratio a/h = 1.5 and the smallest one is for a/h = 1.0
Summary
The use of cellular steel beams is frequently inevitable in structural systems because the presence of circular openings in such beams are required for mechanical and electrical systems or to reduce the weight of the structural systems. When the web of such beams experience compression loads, bending moments, or shear forces, they may show instability or buckle due to principal compression stresses. To increase the strength and stiffness of such webs, vertical web stiffeners are often used In analyzing such webs, it is generally acceptable to assume the webs as plates with the dimension bounded by top and bottom flanges and two adjacent vertical stiffeners. The dimension of a web panel or a plate is a x h as seen, 1. If a web panel of thickness t is subjected to shear force, the differential element of the panel experiences tension and compression principal stresses as seen in the figure. If some or all stresses in the plate is beyond the elastic range, it is called inelastic shear buckling
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