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简支钢管混凝土梁拱组合体系桥设计参数优化

发布时间:2018-01-10 21:00

  本文关键词:简支钢管混凝土梁拱组合体系桥设计参数优化 出处:《重庆交通大学》2015年硕士论文 论文类型:学位论文


  更多相关文章: 梁拱组合体系 设计参数 拱轴线 矢跨比 刚度比 吊杆力


【摘要】:梁拱组合体系桥结合了梁桥和拱桥的特点,在荷载的作用下,各构件形成体系协同工作,结构受力合理、外形美观,克服了传统拱桥拱脚推力大对地基要求高的缺点,成为极富有竞争力的一类桥型,广泛的应用于桥梁建设中。但对梁拱组合体系桥的理论研究仍落后于工程实践,理论体系不完善,在设计优化方面研究不足。因此研究简支钢管混凝土梁拱组合体系桥设计参数优化是具有一定意义的。本文主要研究内容及结论包括:①采用有限元软件Midas Civil建立琼海九曲江大桥有限元模型,进行结构静动力计算,并将应力计算值与施工监控值相对比。计算结果表明结构施工过程安全,成桥状态较为合理,所建有限元模型符合实际情况。②阐述有限元模型分析与理论计算相结合的拱轴线优化方法的原理,并利用该方法对九曲江大桥进行拱轴线优化,削弱了拱肋弯矩峰值,使弯矩分布更加均匀,有效地改善了拱肋的受力状况。③矢跨比、拱梁刚度比、吊杆刚度均为影响结构静动力特性的重要设计参数,分别取多个参数值,计算结构在恒载、活载、温度荷载作用下的内力与挠度,并分析结构的自振频率及振型,在总结设计参数对结构静动力特性影响规律的同时,给出了合理的取值范围,为该体系桥的设计提供了一定参考。④阐述了刚性支承连续梁法、力的平衡法的吊杆力优化原理,并运用上述理论优化九曲江大桥成桥吊杆力,改善结构成桥受力状况,将优化后成桥吊杆力、结构位移及成桥弯矩与原设计进行对比,分析两种方法的优化特点和优化效果。计算结果表明采用刚性支承连续梁法有效地控制了系梁成桥线形,采用力的平衡法则对系梁成桥弯矩更有利。⑤介绍了倒拆法和正装迭代法的计算原理,并应用正装迭代法计算九曲江大桥的吊杆施工张拉力,使吊杆一次张拉到位,避免了后期复杂的调索过程;采用张拉关键吊杆的方式改善拱肋混凝土泵送过程中钢管拱的受力状况,通过二分法原理利用有限元软件计算合适的吊杆张拉力,有效地减少了施工过程中钢管拱的应力和变形。
[Abstract]:The beam-arch composite system bridge combines the characteristics of beam bridge and arch bridge. Under the action of load, each member forms a system to work together, the structure force is reasonable, the appearance is beautiful. It overcomes the shortcoming of the traditional arch bridge with high thrust on the foundation, and becomes a kind of bridge type which is very competitive. It is widely used in bridge construction, but the theoretical research of the bridge is still behind the engineering practice, and the theoretical system is not perfect. Therefore, it is of certain significance to study the optimization of design parameters of simply supported CFST beam arch composite system bridge. The main contents and conclusions of this paper are as follows:. 1. The finite element model of Qionghai Jiuqu River Bridge is established by using the finite element software Midas Civil. The static and dynamic calculation of the structure is carried out, and the stress calculation value is compared with the construction monitoring value. The calculation results show that the construction process of the structure is safe and the state of the bridge is reasonable. The established finite element model is in line with the actual situation .2 describes the principle of the arch axis optimization method combined with the finite element model analysis and theoretical calculation, and uses this method to optimize the arch axis of Jiuqu River Bridge. The peak moment of arch rib is weakened, the distribution of moment is more uniform, and the stress condition of arch rib is improved effectively. The ratio of span to riser, the ratio of stiffness to stiffness of arch beam and the stiffness of suspender are all important design parameters which affect the static and dynamic characteristics of the structure. The internal force and deflection of the structure under dead load, live load and temperature load are calculated, and the natural vibration frequency and vibration mode of the structure are analyzed. While summing up the influence of design parameters on the static and dynamic characteristics of the structure, a reasonable range of values is given, which provides a certain reference for the design of the system bridge and expounds the method of rigid supported continuous beam. The force balance method of the suspension force optimization principle, and the use of the above theory to optimize the Jiuqu River Bridge suspension force, improve the structure of the bridge force condition, will be optimized after the bridge suspenders force. The structural displacement and bridge bending moment are compared with the original design, and the optimization characteristics and effects of the two methods are analyzed. The calculation results show that the rigid support continuous beam method can effectively control the linear shape of the system girder bridge. This paper introduces the calculation principle of inverted disassembly method and formal iteration method, and calculates the tension force of suspension rod construction of Jiuqu River Bridge by using force balance rule. The lifting rod is put in place at one time to avoid the complicated process of adjusting the cable in the later stage; The stress condition of steel pipe arch in the process of concrete pumping with arch rib is improved by using the method of tension key suspender, and the suitable tension of suspender is calculated by using finite element software through the principle of dichotomy. The stress and deformation of steel tube arch during construction are reduced effectively.
【学位授予单位】:重庆交通大学
【学位级别】:硕士
【学位授予年份】:2015
【分类号】:U442.5

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