Preface
This is the seventh edition of CSA Standard S6, Design of Highway Bridges, now designated CAN3—S6-M. It is written in SI (Le Système international d'unités) and replaces the previous edition published in 1974 and Supplement No. 1—1976. Earlier editions of the Standard were published in 1966, 1952, 1938, 1929, and 1922.
In addition to the conversion to SI units, extensive revision has been made to several Clauses—principally, those relating to Limit States (Load Factor) Design in Clauses 8 and 9. It is intended that a supplement will be issued in due course covering Limit States Design for Clause 7. Bolts and lumber sizes are found in yard/pound units since no date has been established for supply of these units in Sl.
The Committee, which consists of practising bridge engineers in the public and private sector and engineers representing industry, has attempted to produce a specification which, used with reasonable engineering judgement, should result in safe, economical structures. It is intended that in the areas of substructure design the specification requirements should be supplemented by adequate field investigations including recommendations from geotechnical experts and where necessary, experts in the field of river hydraulics.
The Committee meets regularly to-consider revisions on an on—going basis and to that end constructive criticism from the user is invited and anticipated.
This Standard was prepared by the CSA Technical Committee on Highway Bridges under the jurisdiction of the Standards Steering Committee on Structures (Design) and was formally approved by these Committees. This Standard has been approved as a National Standard of Canada by the Standards Council of Canada.
Scope
1.1
This Standard applies to the design of ordinary highway bridges that have spans up to 100 m. The Standard sets forth minimum requirements which are consistent with current practice. Modifications may be necessary in order to adapt the Standard for use in the design of a specific bridge. Supplemental specifications with reference to live load, wind load, aerodynamic stability, etc., shall be considered for unusual types of bridges and for bridges with spans longer than 100 m. The Standard may also be used in the design of bridges required to carry pedestrian, cyclist or equestrian traffic.
1.2
Provisions for rail traffic are not included in this Standard. When this type of traffic is a design consideration, the authority having jurisdiction shall specify the loadings to be assumed. Such loadings may be either in lieu of, or supplementary to, the loadings specified herein.
