独塔钢斜拉桥体系设计理论研究

发布时间：2018-06-24 01:34

本文选题：独塔钢斜拉桥 + 体系　；参考：《哈尔滨工业大学》2017年硕士论文

【摘要】：独塔钢斜拉桥具有布置灵活、造型美观的特点,已被广泛地运用在桥梁工程当中,但国内外对于该桥梁体系的研究至今还比较鲜见,设计人员在对独塔钢斜拉桥进行设计时往往难以入手,甚至进入设计误区,导致建成后的桥梁病害频发。本文从一座建成独塔钢斜拉桥的病害入手,对比分析了与其同期完工、造型近似的独塔钢斜拉桥——前者运营过程当中病害频发,后者运营阶段完好。究其根本是二者体系方面的差异:索面形式不同、有无辅助墩、主梁选材不同和塔梁连接形式不同。本文以此为主线,主要研究了独塔钢斜拉桥主梁扭转和单双索面适用界限问题、辅助墩设置及其位置优化、主梁选材方式和塔梁连接形式对全桥的影响,补充和完善了独塔钢斜拉桥体系的设计理论。本文主要章节都采用从特殊到一般的分析方法,首先利用Midas模型分析背景工程独塔钢斜拉桥的力学特性,指出该桥体系设计不合理之处;再进行大量的建模工作,并结合统计分析软件SPSS总结和归纳一般独塔斜拉桥力学特性的规律,提出用于指导独塔钢斜拉桥体系设计的理论方法。在此研究框架下,本文研究发现偏载作用下扭转正应力以主梁中心线为中心大致反对称分布、扭转剪应力由加载侧向远离加载侧逐渐减小,利用正交试验和方差分析确定跨长和索面形式是影响主梁扭转的显著因素,利用量纲分析和结构方程法,得到了单、双索面主梁扭转角的函数表达式,获得了定量确定单、双索面适用界限的方法;利用多目标优化法和回归分析,得到独塔钢斜拉桥辅助墩最优设置位置估计公式,利用方差分析和回归分析,证明和拟合出独塔钢斜拉桥竖弯基频估计公式,并验证可行;设置对照试验,研究主梁材料的对全桥力学特性的影响,获得主梁材料非对称布置的独塔斜拉桥体系影响规律,确定独塔斜拉桥主梁材料的选用原则;通过多组对照试验,研究不同塔梁连接边界形式对全桥的影响规律。本文从独塔钢斜拉桥体系的力学特性出发,通过大量模型分析和统计分析得到可以用于指导独塔钢斜拉桥体系设计的理论,补充和完善了体系分析方法。
[Abstract]:The single-tower steel cable-stayed bridge has been widely used in bridge engineering because of its flexible arrangement and beautiful shape. However, the research on the bridge system at home and abroad is still relatively rare. It is difficult for designers to design single-tower steel cable-stayed bridge, even into the wrong design, which leads to frequent bridge diseases. Starting with the damage of a steel cable-stayed bridge with single tower, this paper compares and analyzes the same time completion and similar shape of the single-tower steel cable-stayed bridge, which is characterized by frequent diseases in the operation process, while the latter is intact in operation stage. The fundamental difference is the difference between the two systems: the form of cable plane is different, the auxiliary pier is not available, the material selection of main beam is different and the connection form of tower and beam is different. Taking this as the main line, this paper mainly studies the problems of the torsion of the main girder and the suitable limit of the single and double cable plane of the steel cable-stayed bridge with single tower, the setting of auxiliary piers and their location optimization, the influence of the material selection of the main beam and the connection form of the tower and beam on the whole bridge. The design theory of single tower steel cable-stayed bridge system is supplemented and perfected. The main chapters of this paper are from special to general analysis methods. Firstly, the Midas model is used to analyze the mechanical characteristics of the single-tower steel cable-stayed bridge in background engineering, and the unreasonable design of the bridge system is pointed out, and then a lot of modeling work is carried out. Combined with the statistical analysis software SPSS to sum up and sum up the general single tower cable-stayed bridge mechanical characteristics the theoretical method for guiding the design of single-tower steel cable-stayed bridge system is put forward. In this research frame, it is found that the torsional normal stress is approximately antisymmetric distribution centered on the center line of the main beam, and the torsional shear stress decreases gradually from the loading side to the far away from the loading side. Using orthogonal test and variance analysis to determine span length and cable plane form are significant factors affecting torsion of main beam. By using dimensional analysis and structural equation method, the functional expressions of torsion angle of single and double cable main beams are obtained, and the quantitative determination of single torsion angle is obtained. Using the method of multi-objective optimization and regression analysis, the optimal location estimation formula of auxiliary pier of single-tower steel cable-stayed bridge is obtained, and the variance analysis and regression analysis are used. The formula of estimating the fundamental frequency of vertical bending of single-tower steel cable-stayed bridge is proved and fitted, and the feasibility is verified, the influence of the material of the main beam on the mechanical properties of the whole bridge is studied, and the influence law of the single-tower cable-stayed bridge system with asymmetric arrangement of the main beam material is obtained. The selection principle of main girder material for single tower cable-stayed bridge is determined, and the influence of different connection boundary forms of tower beam on the whole bridge is studied through multi-group control tests. Based on the mechanical characteristics of single-tower steel cable-stayed bridge system, this paper obtains the theory which can be used to guide the design of single-tower steel cable-stayed bridge system through a large number of model analysis and statistical analysis, and complements and perfects the system analysis method.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U448.27

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