| 柴生波,王克文,王秀兰,吴骞.基于模型试验的双缆多塔悬索桥力学特性研究[J].计算力学学报,2024,41(6):1020~1028 |
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| 基于模型试验的双缆多塔悬索桥力学特性研究 |
| Study on mechanical properties of double-cable multi-tower suspension bridge based on model test |
| 投稿时间：2023-05-03 修订日期：2023-06-07 |
| DOI：10.7511/jslx20230503001 |
| 中文关键词: 桥梁工程 力学特性 模型试验 多塔悬索桥 双缆 振型模态 |
| 英文关键词:bridge engineering mechanical properties model test multi-tower suspension bridge double-cable mode of vibration |
| 基金项目:自然科学基金(51808448,51608440)资助项目. |
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| 摘要点击次数: 43 |
| 全文下载次数: 24 |
| 中文摘要: |
| 为验证双缆多塔悬索桥力学特性,基于理论公式和数值分析开展了双缆多塔悬索桥模型试验。根据设计参数分别建立了传统体系和双缆体系有限元模型,对比分析了两种体系结构变形和桥塔应力;模型试验验证了双缆体系塔梁变形公式精度和动力特性。研究表明,双缆体系试验模型塔梁变形理论值与实测值及模拟值吻合良好,说明试验模型整体精度较好,验证了理论公式精度。实测与有限元模拟发现第一阶振型模态均为加劲梁一阶反对称竖弯,结构固有频率实测值与模拟值误差为6.97%,验证了模型结构振型模态和固有频率。传统体系中塔位移和加载跨加劲梁挠度是双缆体系的3倍左右,非加载跨加劲梁挠度为4倍左右;传统体系中塔塔底应力是双缆体系的3倍左右,证明双缆体系较传统体系能够有效减小中塔位移、加劲梁挠度和中塔塔底应力。 |
| 英文摘要: |
| In order to verify the mechanical characteristics of a double-cable multi-tower suspension bridge,based on the theoretical formula and numerical analysis,the double-cable multi-tower suspension bridge model is tested.According to the design Parameters.The traditional system and double-cable system finite element model are respectively established,two kinds of architecture deformation and bridge-tower stress are analyzed.The model test verifies the accuracy and dynamic characteristics of the double-cable system.The study shows that the theoretical results of the double-cable system test model agree well with the measured and simulation results.It also shows that the overall accuracy of the test model is good,which confirms the accuracy of the theoretical formula.The measured and finite element simulation results indicate that the first mode of the system is the first vertical bending mode of the stiffening girder,and the error between the measured and simulated results of the first natural frequency is 6.97%.In the traditional system,the deflections of the tower and loading span stiffening girder are about 3 times and the non-loading span stiffening girder about 4 times that of the double-cable system.In the traditional system,the bottom stress of the tower is about 3 times that of the double-cable system,which shows that the double-cable system can effectively reduce the displacement,the stiffening girder deflection and the bottom stress of the middle-tower. |
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