Research for AASHTO Standing Committee on Highways. Task 415. Proposed AASHTO Guidelines for Bottom Flange Limits of Steel Box Girders
| 项目名称： | Research for AASHTO Standing Committee on Highways. Task 415. Proposed AASHTO Guidelines for Bottom Flange Limits of Steel Box Girders |
| 摘要： | Steel box girder bridges are being used on a more and more widespread basis as they represent an alternative to steel I-girder bridges. Designers can be tempted to specify very thin/slender bottom flanges for steel box girders in positive moment regions (where the bottom flange is in tension). However, specifying too thin or too slender of a bottom flange could result in problems during fabrication, transportation, erection, or future inspection/maintenance, and potential strength and fatigue issues. Currently there is no consensus on minimum thickness and maximum slenderness limits for steel box girder bottom flanges. Industry recommendations on minimum bottom flange thicknesses vary, but are generally in the range of �� to 1�. Industry recommendations for bottom flange width to thickness (b/t) slenderness ratios also vary, generally over a range from 80 to 135. Since there are currently no limits in the AASHTO LRFD Bridge Design specifications, designs with even higher slenderness ratios are not precluded. The objective of this project was to propose AASHTO guidelines for the minimum thickness and maximum slenderness limits for steel box girder bottom flanges to (1) minimize issues during fabrication, handling, and erection; and (2) enhance the long-term performance of steel box girders. |
| 状态： | Completed |
| 资金： | 80000 |
| 资助组织： | American Association of State Highway and Transportation Officials (AASHTO) |
| 项目负责人： | Dekelbab, Waseem |
| 执行机构： | Georgia Tech Research Corporation |
| 主要研究人员： | White, Donald W |
| 开始时间： | 20180809 |
| 预计完成日期： | 20190708 |
| 实际结束时间： | 20190708 |
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