Flexural behaviour of engineered cementitious composite encased high strength steel composite beam

Abstract

In this paper, the flexural performance of a new type of composite beam comprised of High Strength Steel (HSS) section encased by polyvinyl alcohol-engineered cementitious composite (PVA-ECC) and lightweight concrete (LWC) is studied. An experimental investigation on the flexural performance of HSS beams encased by different thickness of ECC is conducted and their performances are compared with bare HSS beam and normal strength concrete (NSC) encased HSS beam. Four-point bending tests are carried out on simply supported beams including one bare HSS beam, one NSC encased HSS (NSC-HSS) beam and two ECC-LWC encased HSS (ECC-HSS) beams. For ECC-HSS beams, both top and bottom flanges of the HSS sections are encased with PVA-ECC while the web was encased by LWC. The test results showed a significant improvement in loadcarrying capacity, ductility and failure modes for ECC-HSS beams when comparing with bare HSS and NSC-HSS beam.

Numerical and analytical investigations of flexural behaviours of ECC–LWC encased steel beams

“…In contrast, recent studies by the authors [3][4][10][11][12] demonstrated that an alternative encasement configuration where the combined use of Engineered Cementitious Composites (ECC) and Light Weight Concrete (LWC) could successfully prevent local buckling and LTB of both NSS and HSS Ibeams. Since the material cost of ECC is higher than that of NC, ECC was only employed to encase the compression flange of the steel section to prevent the onset of local buckling and LTB, while LWC was employed in the remaining part of the beam to reduce the cost and weight of the beam.…”

“…1c) available in the FE package ABAQUS [13]. In order to reproduce the loading and support conditions used during the tests [4,[10][11][12], rigid loading and support plates were created and connected to the beam at the supports and loading points using the ABAQUS's tie constraint feature [13] (Fig. 1c).…”

“…1c). As previous testy results [4,[10][11][12] confirmed that bond slip could occur between the ECC/LWC and steel interfaces, surface to surface cohesive interactions was employed for prescribing the bond-slip behaviours between the interfaces of ECC and steel section. The push test results obtained by Rana et al [14] were adopted for defining the surface-to-surface cohesive behaviours.…”

“…This study has two main objectives. The first objective is to conduct a comprehensive numerical study which employs the validated 3D non-linear finite element (FE) model suggested in [4,[10][11][12] to model the behaviours of 234 fully ECC-LWC encased steel beams which cover a wider range of material and geometric parameters. The second objective is to propose an analytical model which could predict the full load-deformation behaviours of the encased steel beams.…”

Experimental study of flexural behaviour of high strength steel (HSS) ‐ Engineered Cementitious Composites (ECC) composite beam with profiled steel sheeting

“…Nevertheless, there have been surprisingly limited research work and especially publications on composite beam combining HSS and ECC. The more recent publications are the experimental investigations carried out by Kabir et al [21,22] on compact and slender HSS beams encased with polyvinyl alcohol ECC (PVA-ECC) subjected to four-point bending. The authors found that a significant enhancement of flexural capacity and ductility were achieved for the HSS-ECC encased beam when compared with the bare HSS beam and the HSS-NSC encased beams tested.…”