S6-1966
Design of Highway Bridges
Product Details
Preface
This new edition of CSA Standard S6, supersedes the previous edition dated 1952, entitled Specification for Steel Highway Bridges, and earlier editions published in 1922, 1929, and 1938.
When it became apparent in 1960 that the 1952 edition required revising, the CSA Committee on Highway Bridges, as then constituted, met to consider a proposed list of revisions. In the course of discussion it was agreed that a Standard covering steel highway bridges alone did not go far enough to meet present day needs. The decision was reached to expand the Standard into a specification for the design of highway bridges which would include provisions for structural steel, reinforced concrete, prestressed concrete and timber. At the same time it was decided that, to keep the Standard within bounds, it should be confined to design, omitting all requirements relating to construction or contractual procedures.
This entailed a complete re-writing of the Standard. New members were added to the Committee and Subcommittees were set up to be responsible for preparing the various sections. The aim has been to make the Standard suitable for contemporary design by incorporating recent research results and modern design techniques. However, development in this field is so rapid that continual review and revision will be necessary if the Standard is to serve its purpose adequately in future.
In this edition much use has been made of the American Association of State Highway Officials' Specifications for Highway Bridges, 1961. In particular, the clauses on Loads and Forces follows the AASHO requirements quite closely and acknowledgement is due to AASHO for permission to reproduce material from its specifications. Similarly permission
was granted by the Institute of Civil Engineers to reproduce part of its Code of Practice No. 2, Earth Retaining Structures, which appears as an appendix to this edition. The cooperation of the Institute of Civil Engineers is gratefully acknowledged.
The large number of members on the Committee and the many interests represented made it virtually impossible to arrive at a unanimous endorsement of all requirements by all members. The lengthy period during which the Standard was under preparation did afford, however, the opportunity for debate and the presentation of both sides of controversial issues. In this respect the Committee acted not only as a specification-writing body but also as a forum for the resolution of conflicting opinion. It is hoped that as further revisions become necessary the Committee will continue to function in the same spirit of cooperation as prevailed throughout the preparation of the present edition.
This Standard was prepared by the Committee on Highway Bridges under the jurisdiction of the Sectional Committee on Structures and was approved by these Committees and the CSA Technical Council.
Scope
1.1
This Standard applies to the design of highway bridges which have spans up to 400 feet. It may also be used for the design of bridges which have spans in excess of 400 feet but for such structures supplementary specifications will usually be required.
1.2
Provisions for street car or railway traffic are not included in this Standard. When this type of traffic is a design consideration, the Engineer shall specify the loadings to be assumed. Such loadings may be either in lieu of, or supplementary to, the loadings specified herein.