| 缆索支承桥梁模态阻尼特性及理论分析 |
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| 引用本文： | 郭震山,陈艾荣.缆索支承桥梁模态阻尼特性及理论分析[J].同济大学学报(自然科学版),2005,33(1):1-5. |
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| 作者姓名： | 郭震山 陈艾荣 |
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| 作者单位： | 同济大学,土木工程防灾国家重点实验室,上海,200092 |
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| 基金项目： | 国家自然科学基金资助项目 (5 960 80 0 6) |
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| 摘 要： | 在广泛收集国内大跨缆索支承桥梁的模态阻尼实测资料的基础上，通过对收集到的实测资料进行统计分析，研究了两种缆索支承桥梁：斜拉桥和悬索桥的模态阻尼特性．在现有的基于能量耗散的模态阻尼计算方法的基础上发展了一种缆索支承桥梁模态阻尼计算方法；利用模态阻尼实测数据得到了结合梁斜拉桥、混凝土斜拉桥和钢悬索桥子结构的损失系数，然后利用这一方法计算了南浦大桥、武汉长江二桥和虎门大桥的模态阻尼。
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| 关 键 词： | 缆索支承桥梁 模态阻尼 理论分析 损失系数 能量损耗 |
| 文章编号： | 0253-374X(2005)01-0001-05 |
| 修稿时间： | 2003年10月31 |
Characteristics and Theoretical Analysis of Modal Damping of Cable-supported Bridges |
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| GUO Zhen-shan,CHEN Ai-rong.Characteristics and Theoretical Analysis of Modal Damping of Cable-supported Bridges[J].Journal of Tongji University(Natural Science),2005,33(1):1-5. |
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| Authors: | GUO Zhen-shan CHEN Ai-rong |
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| Abstract: | The field-measured data of modal damping of cable-supported bridges built in China,which is obtained through ambient vibration experiments,are gathered. An analytical method for evaluation of modal damping of cable-supported bridges is presented by modifying the energy-based method,in which the modal damping energy per cycle is evaluated through summing up the dissipated energies of all major damping sources. The loss factors of substructures of composite cable-stayed bridges,concrete cable-stayed bridges and steel suspension bridges are estimated by using the established database of modal damping,and the modal damping of Nanpu Bridge,the Second Wuhan Bridge and Humen Bridge are further evaluated. |
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| Keywords: | cable-supported bridge modal damping theoretical analysis loss factor energy dissipating |
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