斜吊杆布置对中承式钢管混凝土拱桥力学性能的影响

发布时间：2018-04-24 21:18

本文选题：钢管混凝土拱桥 + 倾斜吊杆　；参考：《长安大学》2017年硕士论文

【摘要】：近几十年来,由于钢管混凝土拱桥因为跨越能力强、外形美观、施工便捷等优势,已经被大量的推广运用。然而,在这些钢管混凝土拱桥中斜吊杆的运用却极少。斜吊杆相比于直吊杆布置,可以使拱桥拱具有梁弯矩及挠度变小、整体刚度大、经济美观等优点。斜吊杆布置拱桥,在国外已经得到了广泛应用,但是国内尚未见使用。本文以某一钢管混凝土拱桥为背景工程,以研究在不同斜吊杆布置形式下拱桥结构内力和挠度的变化及结构的稳定性及动力特性。关于钢管混凝土拱桥的发展情况、拱桥吊杆的布置形式的相关研究状况,本文进行了简单的介绍。接着介绍了拱桥的计算理论,包括稳定及动力方面的理论。然后结合具体工程实例,借助桥梁专业有限元软件迈达斯对结构进行模拟,就不同的吊杆布置形式,在线弹性范围内,研究吊杆的布置形式对结构受力的影响。研究表明,相对于直吊杆布置,斜吊布置可以使拱肋弯矩重新分配,正因为这种重新分配,可以使结构受力更加均匀,从而会位移明显的减小。接着,运用线弹性稳定分析法,研究了吊杆布置形式、吊杆刚度及吊杆失效对结构稳定的影响,研究表明,以上几种因素中,吊杆刚度对结构的影响较为明显。同时研究了不同吊杆布置形式对结构动力特性的影响,斜吊杆布置能明显提高拱结构的面内振动的自振频率,而对于面外振动的自振频率影响较小。
[Abstract]:In recent decades, CFST arch bridge has been widely used because of its strong span ability, beautiful appearance, convenient construction and so on. However, in these concrete-filled steel tube arch bridges, inclined suspenders are rarely used. Compared with the arrangement of vertical suspenders, the inclined suspenders can make the arch of the arch bridge have the advantages of smaller bending moment and deflection of beam, larger overall stiffness, and more economical and beautiful. Skew suspenders have been widely used in foreign countries, but they have not been used in our country. In this paper, a concrete filled steel tube arch bridge is used as a background project to study the variation of internal force and deflection, stability and dynamic characteristics of the arch bridge under different slant suspension arrangement. About the development of concrete-filled steel tube arch bridge and the related research status of the arch bridge suspenders, this paper briefly introduces. Then the calculation theory of arch bridge is introduced, including the theory of stability and dynamics. Then, with the help of the bridge professional finite element software Midas, the structure is simulated with concrete engineering examples, and the influence of the arrangement form of the suspender on the force of the structure is studied according to the different arrangement forms of the suspenders and the online elastic range. The research shows that the oblique suspension arrangement can redistribute the bending moment of the arch rib compared with the arrangement of the vertical suspender. Because of this redistribution the force of the structure can be more uniform and the displacement will be reduced obviously. Then, by using the linear elastic stability analysis method, the influence of the configuration of the suspension rod, the stiffness of the suspension rod and the failure of the suspension rod on the structural stability is studied. The results show that among the above factors, the influence of the suspension stiffness on the structure stability is more obvious. At the same time, the influence of different suspenders layout on the dynamic characteristics of the structure is studied. The inclined suspension arrangement can obviously increase the in-plane vibration frequency of the arch structure, but has little effect on the out-of-plane vibration frequency.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U448.22

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