| 三跨连续加劲梁悬索桥基频近似公式 |
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| 引用本文： | 鞠小华.三跨连续加劲梁悬索桥基频近似公式[J].铁道工程学报,2003(2):59-63. |
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| 作者姓名： | 鞠小华 |
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| 作者单位： | 中国铁道建筑总公司,北京,100855 |
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| 摘 要： | 基于能量原理 ,用 Rayleigh— Ritz法导出了三跨连续加劲梁悬索桥的一阶反对称、对称的竖向挠曲自由振动和扭转自由振动的频率 ;并忽略了一些影响悬索桥基频的次要因素 ,对导出的悬索桥基频近似计算公式作了进一步的简化 ,得出了悬索桥自由振动基频的近似公式。最后用导出的悬索桥振动基频近似公式分别对三座三跨连续加劲梁悬索桥算例进行了计算 ,把用本文导出的公式计算出的结果和精确的有限元解相比较 ,结果非常接近 ,其精度可以满足方案选择和初步设计阶段的要求
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| 关 键 词： | 悬索桥 自由振动 基频 近似计算 |
| 文章编号： | 1006-2106(2003)02-0059-05 |
| 修稿时间： | 2003年3月1日 |
APPROXIMATIVE FORMULAS OF CALCULATING PRIMARY FREQUENCIES FOR THREE-SPAN CONTIMUOUS GIRDER SUSPENSION BRIDGES |
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| JU Xiao,hua,China Railway Construction General Corporation.APPROXIMATIVE FORMULAS OF CALCULATING PRIMARY FREQUENCIES FOR THREE-SPAN CONTIMUOUS GIRDER SUSPENSION BRIDGES[J].Journal of Railway Engineering Society,2003(2):59-63. |
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| Authors: | JU Xiao hua China Railway Construction General Corporation |
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| Institution: | JU Xiao hua China Railway Construction General Corporation |
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| Abstract: | Based on energy principles,the ealculations of both the symmetrical and the antisymmetrical natural vertical and torsional frequencies of three span continuous girder suspension bridges are obtained.The calculating formulas are predigested.Three three span examples of suspension bridges are illustrated.The accuracy of the analysis is examined through comparative computation by means of the comprisons between the formulas and the finite element approach.These approximative formulas can be used in process of the project choosing and the preliminary design. |
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| Keywords: | suspension bridge free vibration primary frequency approximative calculation |
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