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Report
City of Vancouver
Burrard Street BridgeRehabilitation DesignLoad Rating
May 2012
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REPORT
Executive Summary
As part of the rehabilitation program for the Burrard Street Bridge, a load rating was conducted for the
Burrard Street Bridge following the bridge inspection in 2011. The analysis was performed in accordance
with the Canadian Highway Bridge Design Code (CHBDC CAN/CSAS6-06), Clause 14.
The bridge was analysed considering up to six traffic lanes using the design vehicle CL625 (64 tonnes) in
combination with distributed live load. This load corresponds to the design load for new highways and
bridges in British Columbia. The assumption of six traffic lanes is expected to accommodate the future
bridge laning configurations envisaged and provide an appropriate assessment of all major structural
elements. Depending on the configuration and details adopted, adding fences and barriers is not expected
to negatively affect the assessment.
The Burrard Street Bridge comprises of two major elements the concrete approaches and the steel truss
spans. Our analysis indicates that all steel truss members have adequate capacity. However, our analysis
of the gusset plates using a simplified method did not find sufficient capacity in all cases. More rigorous
analysis of the remaining gusset plates is required. We recommend additional finite element analysis of the
remaining gusset plates in order to verify their adequacy.
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ReportBurrard Street Bridge Rehabilitation Design
Load Rating
Table of Contents
SECTION PAGE NO
Executive Summary iTable of Contents iii
1 Introduction 1
1.1 Description of the Existing Bridge 1
1.2 Existing Information 3
1.3 Allowances for Future Loading 3
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City of Vancouver
s.13(1); s.15(1)(l); s.17(1)(c), (d), & (f); s.18(a); and s.19(1)(b)
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REPORT
1 Introduction
In 2011, the City Of Vancouver (City) retained Associated Engineering (AE) to carry out a
bridge rehabilitation program for the Burrard Street Bridge. This load evaluation is part of that
assignment.
1.1 Description of the Existing Bridge
The Burrard Street Bridge was built in the 1930's and is one of the primary landmarks in the City of
Vancouver. The general arrangement (GA) is included in Appendix A of this report. The bridge,
shown in Figure 1-1, consists of steel truss main spans and concrete viaduct approaches.
Figure 1-1
Burrard Street Bridge
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City of Vancouver
In 2000, a seismic upgrade was undertaken at Bent 24 in the north approach to the bridge. The
piers and footings were strengthened and longitudinal restrainer and cross bracing seismic
members were installed. Similarly in 2005, seismic upgrades were undertaken for the south
approach spans, including Bents 4, 7, 10, 13, 16, and 19, and a shear wall was installed to
strengthen Bent 4. The seismic upgrading work has no impact on the current load rating study.
The City of Vancouver has also informed us that currently there is a program underway for
replacement of the bearings supporting the approach spans of the Burrard Street Bridge. Allexisting rocker bearings will be replaced with disk bearings; however, the current articulation will be
maintained. In addition, disk bearings will be installed to replace the sliding bearings at Bent 4, and
the span length between Bents 3 and 4 will be decreased by 200 mm.
The bridge has a roadway width of 18 288 m (60-0). The current deck arrangement has a total of
five lanes of vehicular traffic and one lane of bicycle traffic. The load rating analysis was carried ou
based on up to six lanes of traffic to produce the most severe loading condition.
The two identical trusses for both types of deck-truss span are spaced 13 106 mm (43-0) apart
and have a depth of 9144 mm (30-0) between top and bottom chord centerlines. The top chords,
bottom chords, diagonals and load carrying vertical members consist of built-up box sections. The
178 mm (7) thick reinforced concrete deck is supported by steel S24 x 80 stringers spaced at
1828 mm (6-0) The stringers span 6706 mm (22-0) for the 176 truss and 6604 mm (21-8) for
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ReportBurrard Street Bridge Rehabilitation Design
Load Rating
1.2 Existing Information
The following reference documentation was reviewed and considered in conducting this load
evaluation.
x Record Drawings: Burrard Street Bridge Drawings No. 34-E-0 through No. 34-E-53.
x Associated Engineering Close Proximity Inspection Report , February 2012.
x Delcan Burrard Street Bridge Load Evaluation Report , November 2009.
x Seismic Retrofit Drawings:
x Burrard Bridge Bent 24 Seismic Upgrading Drawing No. 1533 1 through 7;
x Burrard Bridge Seismic Upgrading Drawing No. 1720 1 through 17;
x Burrard Bridge Seismic Upgrading Phase II Drawing No. 1170 40 through 59.
1.3 Allowances for Future Loading
At this stage we do not know what bridge modifications may be implemented, and therefore a future
loading allowance cannot be pre-determined. Accordingly, we have not built any allowance for
future loading into our load rating of components. However, as a result of the structural
assessment, we are able to comment on the implications of adding loads to the bridge.
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