详情

原文传递 Lateral Bracing of Long-Span Florida Bulb-Tee Girders.

题名：	Lateral Bracing of Long-Span Florida Bulb-Tee Girders.
作者：	consolazio, g. r. hamilton, h. r.
关键词：	stiffness, buckling, girders, florida, sweep, skew, torsion, camber
摘要：	The primary objectives of this research were to evaluate the lateral stability of long-span Florida bulb-tee girders during the bridge construction process and to offer recommendations for improving such stability. Numerical analysis techniques were used to quantify girder buckling capacities as functions of girder cross-sectional properties, span length, and bridge skew angle. In addition, the influences of factors such as girder sweep, bearing pad creep, and bracing stiffness were investigated as part of a comprehensive parametric study involving 4800 separate buckling analyses. Moderate-term (72 hour) bearing pad creep data were obtained from experimental testing and integrated into numerical analysis models. Results from the parametric study, and associated parameter sensitivity studies, indicated that girder buckling capacities are not strongly influenced by bearing pad creep, but are strongly influenced by the interaction of skew angle and girder slope. Simplified (and conservative) equations were then developed for use in assessing girder buckling strength under the combined effects of skew angle, field imperfections (e.g. sweep), and boundary conditions. A preliminary parametric study of limited scope was also carried out to assess girder stability under lateral wind pressure loading, again taking into account the effects of section type, span length, skew angle, and field conditions such as sweep. Based on results from the wind load parametric study, which involved 480 separate analyses, a preliminary wind capacity estimation equation was developed. / NOTE: Final rept. / Supplementary Notes: Sponsored by Florida State Dept. of Transportation, Tallahassee. Research Management Center. / Availability Note: Order this product from NTIS by: phone at 1-800-553-NTIS (U.S. customers); (703)605-6000 (other countries); fax at (703)605-6900; and email at orders@ntis.gov. NTIS is located at 5285 Port Royal Road, Springfield, VA, 22161, USA.
总页数：	u0810；96p
报告类型：	科技报告