| Nonlinear Dynamic Reliability of Coupled Stay Cables and Bridge Tower |
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| 作者姓名： | 余建星 田佳 董文斌 丁宁 杨晓蓉 谭振东 |
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| 作者单位： | Laboratory of Harbor and Ocean Engineering Tianjin University，Laboratory of Harbor and Ocean Engineering，Tianjin University，Laboratory of Harbor and Ocean Engineering，Tianjin University，Military Transportation Institute，Military Transportation Institute，Military Transportation Institute，Tianjin 300072，China，Tianjin 300072，China，Tianjin 300072，China，Tianjin 300161，China，Tianjin 300161，China，Tianjin 300161，China |
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| 摘 要： | Nonlinear vibration can cause serious problems in long span cable-stayed bridges.When the internal resonance threshold is reached between the excitation frequency and natural frequency,large amplitudes occur in the cable.Based on the current situation of lacking corresponding constraint criteria,a model was presented for analyzing the dynamic reliability of coupling oscillation between the cable and tower in a cable-stayed bridge.First of all,in the case of cable sag,the d'Alembert principle is applied to studying the nonlinear dynamic behavior of the structure,and resonance failure interval of parametric oscillation is calculated accordingly.Then the dynamic reliability model is set up using the JC method.An application of this model has been developed for the preliminary design of one cable-stayed bridge located on Hai River in Tianjin,and time histories analysis as well as reliability indexes have been obtained.When frequency ratio between the cable and tower is approaching 1∶2,the reliability index is 0.98,indicating high failure probability.And this is consistent with theoretical derivation and experimental results in reference.This model,which is capable of computing the reliability index of resonance failure,provides theoretical basis for the establishment of corresponding rule.
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| 关 键 词： | 非线性动力可靠性 电桥性能 共振 参数 |
| 修稿时间： | 2007-06-14 |
Nonlinear Dynamic Reliability of Coupled Stay Cables and Bridge Tower |
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| YU Jianxing,TIAN Jia,DONG Wenbin,DING Ning,YANG Xiaorong,TAN Zhendong.Nonlinear Dynamic Reliability of Coupled Stay Cables and Bridge Tower[J].Transactions of Tianjin University,2007,13(5):334-339. |
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| Authors: | YU Jianxing TIAN Jia DONG Wenbin DING Ning YANG Xiaorong TAN Zhendong |
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| Institution: | 1. Laboratory of Harbor and Ocean Engineering, Tianjin University, Tianjin 300072, China
2. Military Transportation Institute, Tianjin 300161, China |
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| Abstract: | Nonlinear vibration can cause serious problems in long span cable-stayed bridges. When the internal resonance threshold is reached between the excitation frequency and natural frequency,large amplitudes occur in the cable. Based on the current situation of lacking corresponding constraint criteria, a model was presented for analyzing the dynamic reliability of coupling oscillation between the cable and tower in a cable-stayed bridge. First of all, in the case of cable sag, the d'Alembert principle is applied to studying the nonlinear dynamic behavior of the structure, and resonance failure interval of parametric oscillation is calculated accordingly. Then the dynamic reliability model is set up using the JC method. An application of this model has been developed for the preliminary design of one cable-stayed bridge located on Hai River in Tianjin, and time histories analysis as well as reliability indexes have been obtained. When frequency ratio between the cable and tower is approaching 1∶2, the reliability index is 0.98, indicating high failure probability. And this is consistent with theoretical derivation and experimental results in reference. This model, which is capable of computing the reliability index of resonance failure, provides theoretical basis for the establishment of corresponding rule. |
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| Keywords: | cable-stayed bridge stay cable nonlinear vibration internal resonance parametric vibration dynamic reliability |
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