Scope of Code
The OHBDC (MTO 1991) was written for application within Ontario. CSA S6 (CSA 1988) was generated with interprovincial cooperation for use in the other Provinces of Canada and was largely derived from the preceding OHBDC edition. The Provinces and the CSA then agreed that the successor edition to both codes would be the CHBDC, published by the CSA. The Code has been written using the earlier codes as source documents and with the intention of retaining continuity.
The scope of the Code is a little broader than that of the 3rd and last edition of the OHBDC (MTO 1991). Long span bridges and movable bridges are included. In addition to incorporating newer technology, more emphasis is placed on criteria related to seismic design, durability, access for inspection and maintenance.
The Code Scope statement lists types of structures to which the Code is not intended to apply. The list is not exhaustive. The application of the Code to the types of structures listed is not precluded where the Owner or the Authority having jurisdiction over the structure has designated all or part of the Code as being applicable.
Scope of Section 1
Geometrical provisions have been minimized by referring to the Geometric Design Guide for Canadian Roads (TAC 1986).
Many catastrophic failures have been caused by scour at bridge piers and abutments. Good hydraulic design is a fundamental requirement for bridges. Basic hydraulic requirements are specified in the Code, and reference is made to the Guide to Bridge Hydraulics (TAC 1980) for guidance concerning good hydraulic design and detailing.