Flexural Behavior on a Steel–UHPC Composite Deck System of Long-Span Bridges
Publication: Journal of Bridge Engineering
Volume 28, Issue 9
Abstract
With rapid economic development in recent decades, long-span bridges have increasingly attracted attention worldwide. The invention of UHPC (ultrahigh performance concrete) materials has brought more alternatives for long-span bridge deck systems. Compared with the traditional orthotropic steel deck, the UHPC-based deck system greatly reduces the risk of deck fatigue cracking. Recently, a steel–UHPC composite bridge deck (SUCD) system using perfobond strip (PBL) shear connectors is proposed, which shows advantages in terms of self-weight and mechanical properties. However, research focusing on this new steel–UHPC composite bridge deck is limited. In this study, based on a field bridge (under construction), eight full-scale slabs for the SUCD are fabricated and tested to investigate the bending behavior of the structure under sagging and hogging moments. The effects of hole spacing in PBL and reinforcement ratio on the flexural behavior of the SUCD are also studied. In addition, the transverse bending behavior of the SUCD is investigated. To accurately predict the cracking moment and bending capacity of the SUCD, a related calculation method considering the hole effect of PBL is developed and validated by the experiment. Compared with other methods, the prediction demonstrates more accurate results. With the proposed prediction method, the effect of a single parameter on the bending performance is analyzed, and the main factors affecting the mechanical behavior of the SUCD are presented. The findings can provide a reference for the design and further study of the SUCD with PBL shear connectors.
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Acknowledgments
This research was supported by the National Natural Science Foundation of China (Nos. 51978256 and 52278179).
Notation
The following symbols are used in this paper:
- Apbl
- total equivalent area of a PBL shear connector;
- Asb
- total area of bottom rebars;
- Ast
- total area of top rebars;
- b
- width of a composite deck;
- bpbl
- thickness of a PBL shear connector in a transformed section;
- Cc
- compressive force of UHPC;
- Cpbl
- compressive force of a PBL shear connector;
- Csb
- compressive force of bottom rebars;
- Cst
- compressive force of top rebars;
- D
- hole diameter of a PBL shear connector;
- d1–d3
- diameter of traverse, top, and bottom rebars of a specimen, respectively;
- Ec
- elastic modulus of UHPC;
- Epbl
- elastic modulus of a PBL shear connector;
- Es
- elastic modulus of steel;
- Esb
- elastic modulus of a rebar in the bottom;
- Esp
- elastic modulus of a bottom steel plate;
- Est
- elastic modulus of a rebar in the top;
- fcr
- flexural cracking strength of UHPC;
- fcu
- compressive strength of UHPC;
- fpbl
- yield strength of a PBL shear connector;
- fsb
- yield strength of a rebar in the bottom;
- fst
- yield strength of a rebar in the top;
- fsp
- yield strength of a steel plate;
- ft
- tensile strength of UHPC;
- fu
- ultimate strength of steel;
- fy
- yield strength of steel;
- hc
- distance from the top of UHPC to the top of a PBL shear connector;
- hp
- height of a PBL shear connector;
- hsb
- distance from bottom rebars to the top of UHPC;
- hst
- distance from top rebars to the top of UHPC;
- hu
- height of UHPC;
- l
- hole spacing;
- lc
- characteristic length of the cross section of UHPC;
- Mcr0.05
- moment corresponding to 0.05 mm crack width;
- Mu
- bending capacity of a composite slab;
- n
- number of PBL shear connectors;
- s
- clear length of adjacent holes of PBL shear connectors;
- Tc
- tensile force of UHPC;
- Tpbl
- tensile force of a PBL shear connector;
- Tsb
- tensile force of bottom rebars;
- Tst
- tensile force of top rebars;
- tpbl
- thickness of a PBL shear connector;
- ts
- thickness of a steel plate;
- x
- distance from the top of specimen to neutral axis;
- y1–y6
- distance from the resultant force of each part to the elastic neutral axis;
- yt
- height of a UHPC where strain reaches the elastic ultimate tensile strain;
- ϕ
- curvature of the cross section;
- Δw
- increment of crack width from the first visible crack to a 0.05 mm crack;
- σc
- maximum compressive stress of a UHPC under the cracking moment;
- σs
- compressive stress of a bottom steel plate;
- σsb
- compressive stress of bottom rebars;
- σst
- compressive stress of top rebars;
- σpbl1–2
- compressive/tensile stress of a PBL shear connector;
- ɛ0.05
- strain of concrete of a 0.05 mm crack width;
- ɛc
- ultimate compressive strain of a UHPC;
- ɛpbl1–2
- strain of PBL shear connectors;
- ɛs
- strain of a bottom steel plate;
- ɛsb
- strain of bottom rebars; and
- ɛst
- strain of top rebars.
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Information & Authors
Information
Published In
Journal of Bridge Engineering
Volume 28 • Issue 9 • September 2023
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Feb 13, 2023
Accepted: May 16, 2023
Published online: Jul 5, 2023
Published in print: Sep 1, 2023
Discussion open until: Dec 5, 2023
ASCE Technical Topics:
- Bridge decks
- Bridge engineering
- Bridges
- Bridges (by material)
- Bridges (by type)
- Composite bridges
- Concrete bridges
- Decks
- Flexural strength
- Material mechanics
- Material properties
- Materials engineering
- Span bridges
- Steel bridges
- Steel decks
- Strength of materials
- Structural behavior
- Structural engineering
- Structural systems
- Wood bridges
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