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PREFACE

Supplement No, 1-19(7 to < GSA Standard A23.3-l973 Supplement No.1 brings up to date the·1973 edition of CSA Standard A23. 3, Code for the Design of Concrete Structures 'for Buildings. The revisions presented in this Supplement will be in~luded in a metric version of A23.3 to be published in 1977.

This Supplement has two main aims: first, to include technical revisions adopted by the American Concrete Institute since ·the 1971 ACI Building Code was published; and second, to bring up to date references to the National Building Code of Canada.

This Supplement was prepared by the Joint CSA/NBC Committee 'on Reinforced Concrete Design under the jurisdiction of the Standards Steering Committee on Structures (Design) and the Standing Committee on Structural Design of the Associate Committee on the National Building Code and was formally approved by these Committees.

Note: CSA Standards are subjected to periodic review in order to keep them abreast of progress in the industries concerned. Suggestions for improvement will be welcomed at all times. They will be recorded and in due course brought to the attention of the appropriabe Committee for consideration.

Also, requests for interpretation will be accepted by the Committee. They should be worded in such a manner . as to permit a simple "yesn-or "no" answer based on. the literal text of the requirement concerned.

All enquiries regarding this Standard should be .J addressed to Canadian Standards Association, 178 Rexd.ale Boulevard, Rexdale, Ontario M9W lR3.