IBC 2003 (International Building Code)- Chap 24. I believe it incorporates aspects of ASTM E1300 (Standard practice for determining load resistance of glass in buildings).
The Institution of Structural Engineers (London) has a publication "Structural use of glass in buildings" 1999. This has references to international standards from UK, The Netherlands, Australia, USA, and Canada (including ASTM E1300 as noted above).