Reply to the discussion by A.K. El-Sayed on “New Canadian Highway Bridge Design Code design provisions for fibre-reinforced structures”

2007 ◽  
Vol 34 (10) ◽  
pp. 1378
Author(s):  
A A Mufti ◽  
B Bakht ◽  
N Banthia ◽  
B Benmokrane ◽  
G Desgagné ◽  
...  
Keyword(s):  
Highway Bridge ◽  
Code Design ◽  
Design Code ◽  
Bridge Design

Erratum: New Canadian Highway Bridge Design Code design provisions for fibre-reinforced structures

2007 ◽  
Vol 34 (10) ◽  
pp. 1379
Author(s):  
A A Mufti ◽  
B Bakht ◽  
N Banthia ◽  
B Benmokrane ◽  
G Desgagné ◽  
...  
Keyword(s):  
Highway Bridge ◽  
Code Design ◽  
Design Code ◽  
Bridge Design

New Canadian Highway Bridge Design Code design provisions for fibre-reinforced structures

2007 ◽  
Vol 34 (3) ◽  
pp. 267-283 ◽  
Author(s):  
A A Mufti ◽  
B Bakht ◽  
N Banthia ◽  
B Benmokrane ◽  
G Desgagné ◽  
...  
Keyword(s):  
Prestressed Concrete ◽  
Highway Bridge ◽  
Code Design ◽  
Design Code ◽  
Bridge Design ◽  
Near Surface ◽  
Reinforced Polymer ◽  
Deck Slabs ◽  
Fibre Reinforced Polymer ◽  
Precast Construction

This paper presents a synthesis of the design provisions of the second edition of the Canadian Highway Bridge Design Code (CHBDC) for fibre-reinforced structures. New design provisions for applications not covered by the first edition of the CHBDC and the rationale for those that remain unchanged from the first edition are given. Among the new design provisions are those for glass-fibre-reinforced polymer as both primary reinforcement and tendons in concrete; and for the rehabilitation of concrete and timber structures with externally bonded fibre-reinforced-polymer (FRP) systems or near-surface-mounted reinforcement. The provisions for fibre-reinforced concrete deck slabs in the first edition have been reorganized in the second edition to explicitly include deck slabs of both cast-in-place and precast construction and are now referred to as externally restrained deck slabs, whereas deck slabs containing internal FRP reinforcement are referred to as internally restrained deck slabs. Resistance factors in the second edition have been recast from those in the first edition and depend on the condition of use, with a further distinction made between factory- and field-produced FRP. In the second edition, the deformability requirements for FRP-reinforced and FRP-prestressed concrete beams and slabs of the first edition have been split into three subclauses covering the design for deformability, minimum flexural resistance, and crack-control reinforcement. The effect of sustained loads on the strength of FRPs is accounted for in the second edition by limits on stresses in FRP at the serviceability limit state.Key words: beams, bridges, concrete, decks, fibre-reinforced-polymer reinforcement, fibre-reinforced-polymer sheets, prestressing, repair, strengthening, wood.

Equivalent area of voided slabs

1998 ◽  
Vol 25 (4) ◽  
pp. 797-801 ◽  
Author(s):  
Leslie G Jaeger ◽  
Baidar Bakht ◽  
Gamil Tadros
Keyword(s):  
Simple Expression ◽  
Technical Note ◽  
Axial Stiffness ◽  
Highway Bridge ◽  
Slab Thickness ◽  
Design Code ◽  
Bridge Design ◽  
Equivalent Thickness ◽  
Simple Alternative ◽  
Equivalent Area

In order to calculate prestress losses in the transverse prestressing of voided concrete slabs, it is sometimes convenient to estimate the thickness of an equivalent solid slab. The Ontario Highway Bridge Design Code, as well as the forthcoming Canadian Highway Bridge Design Code, specifies a simple expression for calculating this equivalent thickness. This expression is reviewed in this technical note, and a simple alternative expression, believed to be more accurate, is proposed, along with its derivation. It is shown that the equivalent solid slab thickness obtained from consideration of in-plane forces is also applicable to transverse shear deformations, provided that the usual approximations of elementary strength of materials are used in both cases.Key words: axial stiffness, equivalent area, shear deformation, transverse prestressing, voided slab, slab.

Dynamic loading and testing of bridges in Ontario

1984 ◽  
Vol 11 (4) ◽  
pp. 833-843 ◽  
Author(s):  
J. R. Billing
Keyword(s):  
Dynamic Load ◽  
Dynamic Testing ◽  
Highway Bridge ◽  
Vibration Modes ◽  
Design Codes ◽  
Test Results ◽  
Design Code ◽  
Bridge Design ◽  
Strain Measurements ◽  
Bridge Testing

The Ontario Highway Bridge Design Code (OHBDC) contains provisions on dynamic load and vibration that are substantially different from other codes. Dynamic testing of 27 bridges of various configurations, of steel, timber, and concrete construction, and with spans from 5 to 122 m was therefore undertaken to obtain comprehensive data to support OHBDC provisions. Standardized instrumentation, data acquisition, and test and data processing procedures were used for all bridge tests. Data was gathered from passing trucks, and scheduled runs by test vehicles of various weights. Accelerometer responses were used to determine bridge vibration modes, and dynamic amplifications were obtained from displacement or strain measurements. The form of the provisions adopted for dynamic load and vibration was confirmed by the test results, subject to minor adjustment of values. Observations on the distribution of dynamic load, and its relationship to span length and vehicle weight, may provide a basis for future refinement of the dynamic load provisions. If the stiffness of curbs and barrier walls is not included in deflection calculations, bridges designed by deflection could be penalized. Key words: bridges, vibration, bridge testing, bridge design codes.

Corrigendum: Reliability-based geotechnical design in 2014 Canadian Highway Bridge Design Code

2017 ◽  
Vol 54 (10) ◽  
pp. 1521-1521
Author(s):  
Gordon A. Fenton ◽  
Farzaneh Naghibi ◽  
David Dundas ◽  
Richard J. Bathurst ◽  
D.V. Griffiths
Keyword(s):  
Highway Bridge ◽  
Design Code ◽  
Bridge Design ◽  
Geotechnical Design
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