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Strength and behaviour of laterally-unrestrained S690 high-strength steel hybrid girders with corrugated webs
Abstract This paper is devoted to investigate the lateral-torsional buckling (LTB) of hybrid corrugated web girders (CWGs) built up from flanges with a yield stress of 690 MPa, which has been used in bridge construction worldwide. The hybrid girders have been utilised to provide a cost-effective solution because of the high material cost of S690. This investigation has been based on the finite element (FE) modelling by using ABAQUS program. Accordingly, material modelling of S690 has been verified by considering recent experimental tests in the literature. Then, the accuracy of the current FE models of the CWGs has additionally been checked successfully. Parametric study has been carried out on simply-supported girders, for bridge construction, considering mainly the influences of the hybrid ratio and corrugation dimensions on the behaviour of the CWGs built up from HSSs. A limiting slenderness ratio for the inelastic LTB of 2.3 has been found, where more slender girders would not benefit from using such HSS material. Additionally, the strengths of the girders have been compared with EC3 design model, which has been found to provide highly conservative predictions for the current girders. Consequently, a new design model has been suggested. This suggested bending strength is generally found to provide accurate predictions for the hybrid CWGs built up from flanges of S690 HSS; especially for girders failing inelastically. Finally, several comparisons have been provided that might aid the structural engineers in designing efficient hybrid cross-sections in the future.
Highlights Using ABAQUS, a finite element model for hybrid CWGs under flexure is developed. Hybrid CWGs with flanges formed from S690 are currently considered. The fundamental flexural behaviour of such hybrid CWGs is discussed in detail. The proposed design model is shown to predict well the strengths of CWGs.
Strength and behaviour of laterally-unrestrained S690 high-strength steel hybrid girders with corrugated webs
Abstract This paper is devoted to investigate the lateral-torsional buckling (LTB) of hybrid corrugated web girders (CWGs) built up from flanges with a yield stress of 690 MPa, which has been used in bridge construction worldwide. The hybrid girders have been utilised to provide a cost-effective solution because of the high material cost of S690. This investigation has been based on the finite element (FE) modelling by using ABAQUS program. Accordingly, material modelling of S690 has been verified by considering recent experimental tests in the literature. Then, the accuracy of the current FE models of the CWGs has additionally been checked successfully. Parametric study has been carried out on simply-supported girders, for bridge construction, considering mainly the influences of the hybrid ratio and corrugation dimensions on the behaviour of the CWGs built up from HSSs. A limiting slenderness ratio for the inelastic LTB of 2.3 has been found, where more slender girders would not benefit from using such HSS material. Additionally, the strengths of the girders have been compared with EC3 design model, which has been found to provide highly conservative predictions for the current girders. Consequently, a new design model has been suggested. This suggested bending strength is generally found to provide accurate predictions for the hybrid CWGs built up from flanges of S690 HSS; especially for girders failing inelastically. Finally, several comparisons have been provided that might aid the structural engineers in designing efficient hybrid cross-sections in the future.
Highlights Using ABAQUS, a finite element model for hybrid CWGs under flexure is developed. Hybrid CWGs with flanges formed from S690 are currently considered. The fundamental flexural behaviour of such hybrid CWGs is discussed in detail. The proposed design model is shown to predict well the strengths of CWGs.
Strength and behaviour of laterally-unrestrained S690 high-strength steel hybrid girders with corrugated webs
Shao, Yong-Bo (Autor:in) / Zhang, Yu-Mei (Autor:in) / Hassanein, M.F. (Autor:in)
Thin-Walled Structures ; 150
17.02.2020
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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