钢管混凝土拱桥结构动力特性计算与分析-桥梁与隧道工程专业论文.docxVIP

西南交通大学研究生学位论文 西南交通大学研究生学位论文 第1页 摘要 结构动力特性是研究结构抗风、抗震等动力性能的基础，因此，正确地 计算大跨径钢管混凝土拱桥这种新型结构的动力特性尤为重要。到目前为止， 国内在这方面作的研究工作不多，曾有人运用现有的钢管混凝土计算理论对 一座大型的钢管混凝土拱桥结构动力特性进行过研究，结果是计算值与实测 值相差较远。为了真正地弄清产生这种差异的原因，并结合特大型钢管混凝 土拱桥——丫髻沙大桥的抗风试验课题，开展了有关钢管混凝土拱桥结构动 力特性的～些研究工作。 首先系统地概括总结了钢管混凝土的计算理论及其在钢管混凝土结构动 力特性计算中的应用。然后，以大跨径钢管混凝土拱桥——丫髻沙大桥作为 研究对象，建立空间计算模型，研究了全桥在静载作用下主拱肋内不同位置 的混凝土的应力：在此基础上，计算、分析了丫髻沙大桥成桥状态下全桥结 构动力特性。最后，得出以下结论：在对钢管混凝土拱桥进行计算时，对于 钢管混凝土构件，不能按仅受轴力作用的钢管混凝土计算其物理力学性能指 标，而必须考虑到竖向弯曲和水平弯曲对钢管内混凝土受力的影响。 【关键词】 钢管混凝土拱桥主拱肋应双结构动力特性 西南交通大学研究生学位论文 西南交通大学研究生学位论文 第颐 Abstract The structural dynamical characteristic iS the foundation to research the structuraI dynamical performance．such as wind—resistant，vibration．resistant etc Hence．it iS very important to calculate correctly the structuraI dynamical characteristic of the new structure for the long—span concrete filled steel tubular arch bridge Up tO now：little research has been made on the aspect at home Someone has ever studied the stmcturaI dynamical characteristic of a good-sized concrete filled steel tubular arch bridge by the calculation theory about concrete filled steel tube in existence．It falls out that the calculation value is more difierent from the surveying value in practice In order to find out veritably the cause to bring the di虢fence and combine the experimentaion task of resisting wind about the long—span concrete fiUed steel tubular arch bridge_—～Ya Ji Sha Bridge，some research has been made on the structural dynamicN characteristic of the concrete filled steel tubular arch bridge Firstly,the paper is to generalize by the numbers the calculation theory about concrete filled steel tube and its application in calculating the dynamical characteristic of the concrete fiiled steel tubular structure In succession．it iS tO treat Ya Ji Sha Bridge as the researched object，and the spatial calculating model of the bridge iS established．Then，the stress of concrete in the difierent place of main arch rib iS researched when the static loads are