Shear performance of hybrid high-strength steel girders

Keshav Saini , Ricky Lalthazuala , Tekcham G. Singh

Abstract

This paper presents shear behaviour of hybrid high-strength steel (HSS) girders subjected to three-point bending. Finite element (FE) models were developed and validated against existing experimental results for welded homogenous and hybrid girders. The validated FE models were then employed for parametric studies on three different HSS materials with varying nominal yield strengths: 460 MPa, 690 MPa, and 960 MPa. The FE analysis results were presented in the form of shear capacity and observed failure modes. As anticipated, web thickness has a more significant positive impact on shear capacity compared to flange thickness. However, a noticeable improvement in ductility with increasing flange thickness was observed, in contrast to web thickness increases. Three typical failure modes were observed in HSS plate girders: shear dominant, bending dominant, and combined shear and bending modes. Additionally, the applicability of design equations in European Standard (EN 1993-1-5), Direct Strength Method (DSM), and modified DSM versions were assessed through reliability analysis, indicating that these equations are not suitable for designing HSS plate girders under shear. Consequently, modified design equations based on EN 1993-1-5 and DSM for rigid and non-rigid end supports were proposed, offering conservative, lower variance and reliable predictions for hybrid HSS plate girders.

Key Words

direct strength method; hybrid HSS girders; shear capacity; steel I-beam; three-points bending

Address

Keshav Saini — Department of Civil and Infrastructure Engineering, Indian Institute of Technology Jodhpur, India, Jodhpur - 342030
Ricky Lalthazuala — Department of Civil Engineering, National Institute of Technology Mizoram, India, Mizoram – 796012
Tekcham G. Singh — Department of Civil and Infrastructure Engineering, Indian Institute of Technology Jodhpur, India, Jodhpur - 342030

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