Tiêu chuẩn quốc tế

• Số hiệu / Standard Number: AASHTO GPEB:1989
• Năm ban hành / Publication date: 1989
• Tình trạng / Status: W - Hết hiệu lực
• Tên tiếng Anh / Title in English: Guide Specifications for Fatigue Design of Steel Bridges
• Số trang / Page: 41

Phạm vi áp dụng / Scope of standard

PREFACE: These Guide Specifications give alternative fatigue
design procedures that are intended to be used in place of Articles
10.3.1 and 10.3.2 of the Standard Specifications. They accurately
reflect the actual conditions in bridges subjected to traffic
loadings and provide the following additional advantages: (1) They
permit more flexibility in accounting for differing traffic
conditions at various sites. (2) They permit designs for any
desired design life. (3) They provide reasonable and consistent
levels of safety over a broad range of design conditions. (4) They
are based on extensive recent research and can be conveniently
modified in the future if needed to reflect new research results.
(5) They are consistent with recently developed fatigue evaluation
procedures for existing bridges.

The Guide Specifications use the same detail categories and
corresponding fatigue strength data as the Standard Specifications;
they also use methods of calculating stress ranges that are similar
to those used with the Standard Specifications.

The Guide Specifications for the fatigue design of new steel
bridges, and comparable procedures for the fatigue evaluation of
existing steel bridges, were developed in NCHRP Project 12-28(3).
The development of both is described in detail in NCHRP Report 299.
The evaluation procedures are being considered for inclusion in the
Manual for Maintenance Inspection of Bridges.

Commentaries on the provisions of the Guide Specifications are
given in Appendix A. A simplified six-step design procedure based
on the Guide Specifications is given in Appendix B; it can be used
for most rolled beam and plate girder bridges. Examples of the
application of the Guide Specifications in the design of (1) a
simple-span plate-girder bridge and (2) a two-span continuous
plate-girder bridge are given in Appendix C.