Techno Press

Steel and Composite Structures   Volume 25, Number 6, December30 2017, pages 671-684
Simplified method for prediction of elastic-plastic buckling strength of web-post panels in castellated steel beams
Mei Liu, Kangrui Guo, Peijun Wang, Chao Lou and Yue Zhang

Abstract     [Full Text]
    Elastic-plastic shear buckling behaviors of the web-post in a Castellated Steel Beam (CSB) with hexagonal web openings under vertical shear force were investigated further using Finite Element Model (FEM) based on a sub-model, which took the upper part of the web-post under horizontal shear force to represent the whole web-post under vertical shear force. A simplified design method for the web-post elastic-plastic shear buckling strength was proposed based on simulation results of the sub-model. Proper boundary conditions were applied to the sub-model to assure that its behaviors were identical to those of the whole web-post. The equation to calculate the thin plate elastic shear buckling strength was adopted as the basic form to build the design equation for elastic-plastic buckling strength of the sub-model. Parameters that might affect the elastic-plastic shear buckling strength of the whole web-post were studied. After obtaining the vertical shear buckling strength of a sub-model through FEM, the shear buckling coefficient k can be obtained through the back analysis. A practical calculation method for k was proposed through curving fitting the parameter study results. The elastic-plastic shear buckling strength of the web-post calculated using the proposed shear buckling coefficient k agreed well with that obtained from the FEM and test results. And it was more precise than those obtained from EC3 based on the strut model.
Key Words
    castellated steel beam; web-post; elastic-plastic shear buckling; plate shear buckling coefficient; design method
Mei Liu; Kangrui Guo; Peijun Wang; Chao Lou : School of Civil Engineering, Shandong University, Jinan, Shandong Province, 250061, China
Kangrui Guo : Shandong Urban and Rural Planning Design Institute, Jinan, Shandong Province, 250061, China
Yue Zhang : Shanghai Construction No. 1 (Group) Co. LTD, Shanghai, 200120, China

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