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North Vancouver, Canada

Buckland P.G.,Buckland and Taylor Ltd.
Structure and Infrastructure Engineering | Year: 2014

The argument is made that when retrofitting a suspension bridge, the greatest value is obtained when the engineer considers the fundamentals of engineering, rather than simply following the code. By 'fundamentals', two aspects are considered. One is a thorough understanding of not only structural behaviour, but also how loads, resistances and safety factors are derived. The other aspect covers the fundamentals of good design (as opposed to good analysis), in preparing designs that can be constructed during short occupancies and are tolerant of problems that might arise during the short construction period between deadlines. The design aspect includes looking for opportunities to reduce maintenance and improve inspection access, and produce such other benefits as may be desired. © 2013 Taylor & Francis.

Bergman D.,Buckland and Taylor Ltd.
Engineering for Progress, Nature and People | Year: 2014

The new St Croix River Bridge in Minnesota is a critical new piece of infrastructure required to replace the existing functionally obsolete Stillwater Lift Bridge which was constructed in 1931. The form of the bridge was developed over a long exhaustive process required to address stakeholder issues with the environmentally sensitive site. The paper describes the process for the development of the project, including the basis for the selection of the extradosed bridge form, and the aesthetic theme and features developed and incorporated into the design to address the stakeholder concerns.

Habibi F.,McGill University | Redl E.,Buckland and Taylor Ltd. | Egberts M.,Egberts Engineering Ltd | Cook W.D.,McGill University | Mitchell D.,McGill University
Canadian Journal of Civil Engineering | Year: 2012

This paper investigates the post-punching behaviour of reinforced concrete slab-column connections with a goal of providing adequate structural integrity reinforcement. The test results of seven interior slab-column connections are presented. A study was made of the effects of slab thickness, length of structural integrity reinforcing bars, distribution of structural integrity reinforcement in slabs with rectangular columns, and the placement of structural integrity reinforcement in slabs with drop panels. Results from this test series and other researchers were compared with predictions using the CSA A23.3-04 design equations for both punching shear and post-punching resistance. The test results demonstrated that the provision of structural integrity reinforcement in accordance with the requirements of CSA A23.3-04 resulted in significant post-punching resistance and the design equations provide a reasonable estimate of this resistance.

Gale R.C.,Buckland and Taylor Ltd.
Proceedings, Annual Conference - Canadian Society for Civil Engineering | Year: 2012

The improving performance of structural steel, the efficiency of plate girders, and growing span lengths for plate girder bridges increases the critical nature of girder stability during construction. Permanent design may not anticipate the unbraced lengths that could occur during girder erection and unbraced plate girders can be unstable. Consideration must be given for erection of individual plate girder elements, as well as girder systems, to avoid overstress and/or instability from the dead and live loads that will act upon a partially, or fully assembled structure. During construction, the potentially complex operation of erecting plate girders is often left solely to the general contractor and/or their subcontractor to plan and execute. Stability of the girders, for all phases of erection until the bridge deck becomes composite, lies within the means and methods of a carefully planned erection procedure. Analysis tools, engineering judgment, practical experience, and knowledge of construction techniques, are all required to make suitable and safe erection schemes and procedures. This paper provides an overview of analysis methods available to determine if buckling is a potential issue for one or a group of plate girders. The paper also reviews construction techniques capable of increasing the factor of safety for global buckling for straight plate girders during erection.

Schmaus M.,Buckland and Taylor Ltd.
Proceedings, Annual Conference - Canadian Society for Civil Engineering | Year: 2012

Built in 1983, BC Place Stadium was the largest air-supported dome in the world. It was built as a multi-purpose venue with a capacity of 60,000 people. The fabric of the original roof was made of woven Teflon with a design life of 25 years. After a partial failure of the fabric during a severe storm in December 2006, local politicians decided to replace the roof and to upgrade the entire stadium for over $580 Million in order to create a new architectural signature for Vancouver. The new cable-supported roof has a maximum span of more than 260 m and is supported by 36 masts around the stadium's outer rim, with each mast being 50 m high and weighing more than 100 tons. The outer section of the roof above the spectator zone consists of fixed fabric while the inner roof section above the turf consists of movable fabric, which can be retracted into a "garage" suspended at midfield. Buckland & Taylor Ltd.'s scope of work was to analyze and to verify the construction stages and to design the 70 m high central erection tower. Other tasks included the independent check of cable unstressed lengths and geometry control services. The tight project schedule and the strength limitations of the existing concrete structure have together created an unprecedented number of constraints on the erection sequence. This has required numerous changes to the original erection sequence and consequent necessity to re-analyze the sequence several times to reach the final approved procedure.

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