BRACING OF STEEL BEAMS IN BRIDGES. FINAL REPORT
BRACING OF STEEL BEAMS IN BRIDGES. FINAL REPORT
复制标题
桥梁中钢梁的支撑。
DOI：
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发表时间：
1992
期刊：
影响因子：
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通讯作者：
S. Webb
中科院分区：
文献类型：
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作者：
J. Yura;B. Phillips;S. Raju;S. Webb
该报告总结了为评估桥面横向支撑效果而进行的研究。提出了控制弯扭屈曲的支撑钢梁的设计要求。支撑分为抗扭支撑（横隔梁、横向框架）或横向支撑（上弦杆、桥面板）。进行了分析研究，研究了支撑类型、尺寸、位置和支撑数量对不同荷载条件下梁横向屈曲的影响。对双梁进行的试验结果与解析解相比是有利的。试验结果和理论解均表明，截面畸变对扭转支撑有显著影响。与新的AASHTO横向屈曲公式相比，无支撑或全支撑的试验都是有利的。根据试验和理论，提出了适用于设计和规范的支撑力和支撑刚度的简单计算公式。对于横向支撑，支撑力为梁力的0.8%，其中包括一些梁不直的规定。对于扭转支撑，设计公式可用于确定腹板加劲肋要求，以控制截面变形。五个设计示例说明了支撑公式的使用。
The report summarizes the research conducted to evaluate the lateral bracing effect of bridge decks. Design requirements for bracing steel beams to control lateral-torsional buckling are developed. Braces are classified as torsional braces (diaphragms, cross frames) or lateral braces (top chord laterals, bridge decks). Analytical studies were conducted which investigated the effect of brace type, size, location, and number of braces on the lateral buckling of beams subject to different loading conditions. Results of tests conducted on twin beams compared favorably with the analytical solution. Both the tests and the theoretical solution showed the cross section distortion had a significant effect on torsional braces. The tests with no bracing or full bracing compared favorably with the new AASHTO lateral buckling formulas. From the tests and the theory, simple formulas for brace force and brace stiffness are presented which are suitable for design and specifications. For lateral bracing, the brace force is 0.8% of the beam force, which includes some provision for beam out-of-straightness. For torsional bracing, the design formulas can be used to determine web stiffener requirements to control cross section distortion. Five design examples illustrate the use of the bracing formulas.