大跨径单叶双曲面空间缆索悬索桥的静动载试验研究
发布时间：2018-11-24 13:41
【摘要】：悬索桥跨径的不断增加是一种发展趋势,传统平行缆索悬索桥的空间抗扭刚度较差,随着跨度的增大,悬索桥的抗风稳定性问题变得十分突出。利用单叶双曲面直纹性的特点,借鉴西藏墨脱藤网桥,提出了单叶双曲面空间缆索体系悬索桥方案。本文采用试验和有限元分析相结合的方法,开展单叶双曲面空间缆索体系悬索桥的静动力特性研究,探讨这种新型空间缆索体系悬索桥相比于传统的悬索桥在力学性能上的优势。制作了椭圆环梁的单叶双曲面空间缆索体系悬索桥试验模型,开展新型空间缆索体系悬索桥的静动载试验研究。进行了竖向荷载静力试验,水平荷载静力试验,移动车辆荷载试验以及模型自振特性测试试验。通过试验,获得了索力分布特征,证实了空间缆索具有优良的协同工作性能。新型悬索桥的竖向刚度略有增加,横向刚度和抗扭刚度具有很大的提高,抗风稳定性能良好。随着竖向堆载的增加,新型悬索桥缆索的内力不断增加,结构的重力刚度不断增加,空间缆索内力的水平分力不断增加,较大地提高了新型悬索桥的水平向刚度。通过移动车辆荷载试验,研究了移动车辆荷载作用下新型悬索桥的动位移和动应变响应,证实了新型悬索桥具有阻尼大,行车平稳等特性。通过模态试验,获取了新型悬索桥结构的模态特征,证实了新型悬索桥的整体刚度具有很大的提高。采用ansys有限元软件建立三维有限元模型,对模型试验进行仿真分析,对比分析了有限元计算结果和试验实测结果,两者吻合较好。为了进一步研究新型悬索桥结构的受力机理,建立了相同参数的平行缆索悬索桥有限元模型,对比分析了竖向、水平和移动荷载的受力特性以及结构的自振特性,可以发现新型悬索桥抵抗水平荷载的工作性能大大的高于平行缆索悬索桥。同时,也建立了圆形环梁的单叶双曲面悬索桥的有限元模型,开展了结构性能对比分析,研究表明,椭圆环梁和圆形环梁的空间悬索桥结构性能差异不大。进行了主跨4000米级单叶双曲面和平行缆索悬索桥的方案设计,建立两者空间有限元分析模型,对比分析了两者在成桥状态自重作用、汽车活荷载作用和横向风荷载作用下的静力性能,开展了新型悬索桥的自振特性、静风稳定性能和动风稳定性能等研究。通过研究可以发现,单叶双曲面空间缆索悬索桥具有良好的抗风稳定性能,是未来建造3000～5000米超大跨径海峡悬索桥的一种可行方案。
[Abstract]:The increasing span of suspension bridge is a trend of development. The spatial torsional stiffness of traditional parallel cable suspension bridge is poor. With the increase of span, the problem of anti-wind stability of suspension bridge becomes very prominent. Based on the characteristics of single leaf hyperboloid straightness, a suspension bridge scheme of single leaf hyperboloid space cable system is proposed. In this paper, the static and dynamic characteristics of a single leaf hyperboloid space cable suspension bridge are studied by means of the combination of test and finite element analysis. The advantages of the new space cable suspension bridge compared with the traditional suspension bridge in mechanical properties are discussed. The experimental model of a single leaf hyperboloid space cable system suspension bridge with elliptical ring beam is made, and the static and dynamic load test of a new space cable system suspension bridge is carried out. The vertical load static test, horizontal load static test, moving vehicle load test and model natural vibration characteristic test are carried out. Through experiments, the characteristics of cable force distribution are obtained, and it is proved that space cable has excellent cooperative working performance. The vertical stiffness of the new suspension bridge is slightly increased, the lateral stiffness and torsional stiffness are greatly improved, and the wind stability is good. With the increase of vertical surcharge, the internal force of the new type suspension bridge cable is increasing, the gravity stiffness of the structure is increasing, and the horizontal component force of the space cable internal force is increasing, which greatly improves the horizontal stiffness of the new suspension bridge. The dynamic displacement and dynamic strain response of a new type suspension bridge under moving vehicle load is studied by means of moving vehicle load test. It is proved that the new suspension bridge has the characteristics of large damping and steady running. The modal characteristics of the new suspension bridge structure are obtained by modal test, and it is proved that the overall stiffness of the new suspension bridge is greatly improved. Three-dimensional finite element model was established by using ansys finite element software, and the model test was simulated and analyzed. The results of finite element calculation and experimental measurement were compared and analyzed, which were in good agreement with each other. In order to further study the stress mechanism of the new suspension bridge structure, the finite element model of parallel cable suspension bridge with the same parameters is established, and the stress characteristics of vertical, horizontal and moving loads and the natural vibration characteristics of the structure are compared and analyzed. It can be found that the performance of new suspension bridge against horizontal load is much higher than that of parallel cable suspension bridge. At the same time, the finite element model of the single leaf hyperboloid suspension bridge with circular ring beam is established, and the structural performance of the hyperboloid suspension bridge is compared and analyzed. The results show that there is little difference in the structural performance between the elliptical ring beam and the circular ring beam. The scheme design of hyperboloid and parallel cable suspension bridge with single leaf and main span of 4000 meters is carried out, and the spatial finite element analysis models of the two bridges are established, and the deadweight effects of the two bridges in the state of completion are compared and analyzed. The static behavior of a new suspension bridge under the action of live load and transverse wind load is studied in this paper, such as the natural vibration, static wind stability and dynamic wind stability of the new suspension bridge. It is found that the single leaf hyperboloid space cable suspension bridge has good wind-resistant stability and is a feasible scheme for the construction of 3000m 5000m super-span channel suspension bridge in the future.
【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U448.25
本文编号：2353937
[Abstract]:The increasing span of suspension bridge is a trend of development. The spatial torsional stiffness of traditional parallel cable suspension bridge is poor. With the increase of span, the problem of anti-wind stability of suspension bridge becomes very prominent. Based on the characteristics of single leaf hyperboloid straightness, a suspension bridge scheme of single leaf hyperboloid space cable system is proposed. In this paper, the static and dynamic characteristics of a single leaf hyperboloid space cable suspension bridge are studied by means of the combination of test and finite element analysis. The advantages of the new space cable suspension bridge compared with the traditional suspension bridge in mechanical properties are discussed. The experimental model of a single leaf hyperboloid space cable system suspension bridge with elliptical ring beam is made, and the static and dynamic load test of a new space cable system suspension bridge is carried out. The vertical load static test, horizontal load static test, moving vehicle load test and model natural vibration characteristic test are carried out. Through experiments, the characteristics of cable force distribution are obtained, and it is proved that space cable has excellent cooperative working performance. The vertical stiffness of the new suspension bridge is slightly increased, the lateral stiffness and torsional stiffness are greatly improved, and the wind stability is good. With the increase of vertical surcharge, the internal force of the new type suspension bridge cable is increasing, the gravity stiffness of the structure is increasing, and the horizontal component force of the space cable internal force is increasing, which greatly improves the horizontal stiffness of the new suspension bridge. The dynamic displacement and dynamic strain response of a new type suspension bridge under moving vehicle load is studied by means of moving vehicle load test. It is proved that the new suspension bridge has the characteristics of large damping and steady running. The modal characteristics of the new suspension bridge structure are obtained by modal test, and it is proved that the overall stiffness of the new suspension bridge is greatly improved. Three-dimensional finite element model was established by using ansys finite element software, and the model test was simulated and analyzed. The results of finite element calculation and experimental measurement were compared and analyzed, which were in good agreement with each other. In order to further study the stress mechanism of the new suspension bridge structure, the finite element model of parallel cable suspension bridge with the same parameters is established, and the stress characteristics of vertical, horizontal and moving loads and the natural vibration characteristics of the structure are compared and analyzed. It can be found that the performance of new suspension bridge against horizontal load is much higher than that of parallel cable suspension bridge. At the same time, the finite element model of the single leaf hyperboloid suspension bridge with circular ring beam is established, and the structural performance of the hyperboloid suspension bridge is compared and analyzed. The results show that there is little difference in the structural performance between the elliptical ring beam and the circular ring beam. The scheme design of hyperboloid and parallel cable suspension bridge with single leaf and main span of 4000 meters is carried out, and the spatial finite element analysis models of the two bridges are established, and the deadweight effects of the two bridges in the state of completion are compared and analyzed. The static behavior of a new suspension bridge under the action of live load and transverse wind load is studied in this paper, such as the natural vibration, static wind stability and dynamic wind stability of the new suspension bridge. It is found that the single leaf hyperboloid space cable suspension bridge has good wind-resistant stability and is a feasible scheme for the construction of 3000m 5000m super-span channel suspension bridge in the future.
【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U448.25
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