大跨度斜拉桥抗风性能分析与试验研究
发布时间：2019-04-17 06:55
【摘要】：斜拉桥以其跨越能力大、桥型优美以及良好的经济性等优点得到了迅速的发展。近些年来,斜拉桥的跨度越来越大,结构的刚度和阻尼逐渐减小,结构的抗风稳定问题日益突出。本文以某不对称独塔钢箱梁斜拉桥为工程背景,对斜拉桥的抗风性能进行理论分析和试验研究。 本文从斜拉桥的自振特性、气动参数识别、静风响应、颤振稳定性等方面展开研究,主要工作如下： (1)通过建立三维有限元空间计算模型,对斜拉桥进行了自振特性分析。计算了模型的自振特性,得到桥梁结构的模态和自振频率,为开展主梁节段模型风洞试验及桥梁抗风性能分析提供必要的参数。 (2)完成了主梁节段模型测振试验。由试验测出了颤振临界风速,评价了桥梁的颤振稳定性,桥梁在±3°和0°初始攻角下的颤振临界风速均高于颤振检验风速。 (3)利用数值风洞技术,采用改进的k-ε模型数值模拟计算了主梁的气动三分力系数,并采用强迫振动数值模拟方法识别了主梁的颤振导数,为计算自激力和颤振分析提供参数。对桥梁的进行了静风响应计算,分析了桥梁在不同风攻角下的响应。 (4)对斜拉桥进行了二自由度耦合颤振分析。通过matlab语言编程实现了二维耦合颤振理论计算颤振临界风速的算法,利用数值模拟识别的颤振导数分析了桥梁的颤振临界状态,与测振试验结果相符。
[Abstract]:Cable-stayed bridge has been developed rapidly because of its advantages such as large span capacity, graceful bridge type and good economy. In recent years, the span of cable-stayed bridge becomes larger and larger, the stiffness and damping of the structure decrease gradually, and the wind stability of the structure becomes more and more prominent. Based on the engineering background of an asymmetric single-tower steel box girder cable-stayed bridge, the wind resistance of the cable-stayed bridge is analyzed theoretically and experimentally. In this paper, the natural vibration characteristics of cable-stayed bridges, aerodynamic parameters identification, static wind response, flutter stability and other aspects are studied. The main work is as follows: (1) the 3D finite element spatial calculation model is established. The natural vibration characteristics of cable-stayed bridge are analyzed. The natural vibration characteristics of the model are calculated, and the modal and natural frequencies of the bridge structure are obtained, which provides the necessary parameters for the wind tunnel test of the main beam segment model and the analysis of the wind resistance performance of the bridge. (2) the vibration measurement test of the main beam segment model is completed. The critical flutter wind speed is measured and the flutter stability of the bridge is evaluated. The critical flutter wind speed of the bridge at 卤3 掳and 0 掳initial angle of attack is higher than that of flutter test wind speed. (3) using the technique of numerical wind tunnel, the aerodynamic three-component force coefficient of the main beam is calculated by using the improved k-蔚 model, and the flutter derivative of the main beam is identified by the numerical simulation method of forced vibration. It provides parameters for calculating the self-excitation force and flutter analysis. The static wind response of the bridge is calculated and the response of the bridge at different angles of attack is analyzed. (4) the coupled flutter analysis of cable-stayed bridge with two degrees of freedom is carried out. The two-dimensional coupled flutter theory is used to calculate the flutter critical wind speed by programming in matlab language. The flutter critical state of the bridge is analyzed by using the flutter derivative identified by numerical simulation, which is in agreement with the experimental results of vibration measurement.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.27;U442.59
本文编号：2459209
[Abstract]:Cable-stayed bridge has been developed rapidly because of its advantages such as large span capacity, graceful bridge type and good economy. In recent years, the span of cable-stayed bridge becomes larger and larger, the stiffness and damping of the structure decrease gradually, and the wind stability of the structure becomes more and more prominent. Based on the engineering background of an asymmetric single-tower steel box girder cable-stayed bridge, the wind resistance of the cable-stayed bridge is analyzed theoretically and experimentally. In this paper, the natural vibration characteristics of cable-stayed bridges, aerodynamic parameters identification, static wind response, flutter stability and other aspects are studied. The main work is as follows: (1) the 3D finite element spatial calculation model is established. The natural vibration characteristics of cable-stayed bridge are analyzed. The natural vibration characteristics of the model are calculated, and the modal and natural frequencies of the bridge structure are obtained, which provides the necessary parameters for the wind tunnel test of the main beam segment model and the analysis of the wind resistance performance of the bridge. (2) the vibration measurement test of the main beam segment model is completed. The critical flutter wind speed is measured and the flutter stability of the bridge is evaluated. The critical flutter wind speed of the bridge at 卤3 掳and 0 掳initial angle of attack is higher than that of flutter test wind speed. (3) using the technique of numerical wind tunnel, the aerodynamic three-component force coefficient of the main beam is calculated by using the improved k-蔚 model, and the flutter derivative of the main beam is identified by the numerical simulation method of forced vibration. It provides parameters for calculating the self-excitation force and flutter analysis. The static wind response of the bridge is calculated and the response of the bridge at different angles of attack is analyzed. (4) the coupled flutter analysis of cable-stayed bridge with two degrees of freedom is carried out. The two-dimensional coupled flutter theory is used to calculate the flutter critical wind speed by programming in matlab language. The flutter critical state of the bridge is analyzed by using the flutter derivative identified by numerical simulation, which is in agreement with the experimental results of vibration measurement.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.27;U442.59
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