六七式铁路舟桥动力学特性的研究
发布时间：2018-10-09 09:49
【摘要】：相较于传统桥梁而言,由于浮桥在执行短期、应急任务时更加高效便捷,节省费用,因此逐渐得到越来越广泛的应用。国内外许多学者对于浮桥的力学特性开展了不同程度的理论探索和试验研究。然而,这些方法绝大多数都是将浮桥所处的流体视为静止状态,即只考虑了静水的浮力作用,并未考虑不同水波状态下(诸如水深、水波方向、浪高以及圆频率等因素)对于浮桥所产生的影响。基于这样一种研究现状,本文从全新的角度入手,寻找到了一种假设更为合理并且可以用来进行浮桥水动力作用分析的方法。论文首先从一个简单浮体模型入手,利用势流理论并借助数学手段,给出了浮体速度势各部分的表达形式,并推导出了流场所要满足的边界条件;其次基于格林第三公式,利用三维源汇理论求解出了流场速度势;再次,将作用在浮桥不同部位上的各种静载和动载加以耦合,根据频域和时域相关分析理论,借助有限元相关知识,推导出了浮桥动力学方程。通过对该方程进行求解,即可以计算出水波、列车等荷载作用下浮桥梁部内力、位移、加速度、挠度、转角等力学参数的变化情况。这就为浮桥水动力学的理论研究提供了一种新的思路和方法。为了充分论证本文研究方法的可靠性,以一座浮桥实例为试算模型,通过利用本文方法所算得的结果与参考文献中借助软件模拟所求得的结果相比较,发现二者在数值上非常接近,这就说明本论文所研究的方法是正确的,同时具有普遍适用性,可用于水波作用下的各种浮桥的水动力学特性分析。接着,以京山线蓟运河六七式抢修铁路舟桥作为工程实例展开研究,利用前文中所推导出的方法对该六七式铁路舟桥进行动力学特性的分析,讨论诸如波高、圆频率以及入射波角度等波相关参数变化对浮桥所产生的影响。最后,在此基础上又研究了水波和列车荷载联合作用下浮桥水动力学特性的研究,同时讨论了不同轴重、不同车速下舟桥的通载情况。
[Abstract]:Compared with traditional bridges, floating bridges are more and more widely used because of their short-term, more efficient and convenient emergency tasks and less cost. Many scholars at home and abroad have carried out theoretical and experimental research on the mechanical properties of floating bridges to varying degrees. However, most of these methods treat the fluid in the floating bridge as a static state, that is, only the buoyancy of the static water is considered, but not in different water wave states (such as water depth, water wave direction, etc.) The influence of wave height and circular frequency on the floating bridge. Based on this kind of research status, this paper starts with a new point of view, and finds a method that is more reasonable and can be used to analyze the hydrodynamic action of floating bridge. This paper starts with a simple floating body model, using the potential flow theory and mathematical means, gives the expression form of each part of the velocity potential of floating body, and deduces the boundary conditions to be satisfied by the flow site, secondly, based on Green's third formula, The velocity potential of the flow field is solved by using the three-dimensional theory of source and sink. Thirdly, various static and dynamic loads acting on different parts of the floating bridge are coupled. According to the theory of correlation analysis in frequency domain and time domain, the knowledge of finite element is used. The dynamic equation of floating bridge is derived. By solving the equation, the variation of mechanical parameters such as internal force, displacement, acceleration, deflection and angle of the floating bridge beam can be calculated under the action of water wave and train. This provides a new idea and method for the theoretical study of hydrodynamics of floating bridges. In order to fully demonstrate the reliability of the research method in this paper, a floating bridge example is taken as a trial calculation model. The results obtained by using the method in this paper are compared with those obtained by software simulation in the reference. It is found that the two methods are very close to each other numerically, which shows that the method studied in this paper is correct and can be used to analyze the hydrodynamic characteristics of various floating bridges under the action of water waves. Then, taking Jiyue railway boat bridge of Jingshan line as an engineering example, the dynamic characteristics of the six or seven type railway boat bridge are analyzed by using the method deduced in the previous paper, and the wave height, for example, is discussed. The influence of the variation of wave parameters such as circular frequency and incident wave angle on the floating bridge. Finally, the hydrodynamic characteristics of the pontoon bridge under the combined action of water wave and train load are studied. At the same time, the on-load of the pontoon bridge under different axle loads and different speeds is discussed.
【学位授予单位】：石家庄铁道大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441.3
本文编号：2258895
[Abstract]:Compared with traditional bridges, floating bridges are more and more widely used because of their short-term, more efficient and convenient emergency tasks and less cost. Many scholars at home and abroad have carried out theoretical and experimental research on the mechanical properties of floating bridges to varying degrees. However, most of these methods treat the fluid in the floating bridge as a static state, that is, only the buoyancy of the static water is considered, but not in different water wave states (such as water depth, water wave direction, etc.) The influence of wave height and circular frequency on the floating bridge. Based on this kind of research status, this paper starts with a new point of view, and finds a method that is more reasonable and can be used to analyze the hydrodynamic action of floating bridge. This paper starts with a simple floating body model, using the potential flow theory and mathematical means, gives the expression form of each part of the velocity potential of floating body, and deduces the boundary conditions to be satisfied by the flow site, secondly, based on Green's third formula, The velocity potential of the flow field is solved by using the three-dimensional theory of source and sink. Thirdly, various static and dynamic loads acting on different parts of the floating bridge are coupled. According to the theory of correlation analysis in frequency domain and time domain, the knowledge of finite element is used. The dynamic equation of floating bridge is derived. By solving the equation, the variation of mechanical parameters such as internal force, displacement, acceleration, deflection and angle of the floating bridge beam can be calculated under the action of water wave and train. This provides a new idea and method for the theoretical study of hydrodynamics of floating bridges. In order to fully demonstrate the reliability of the research method in this paper, a floating bridge example is taken as a trial calculation model. The results obtained by using the method in this paper are compared with those obtained by software simulation in the reference. It is found that the two methods are very close to each other numerically, which shows that the method studied in this paper is correct and can be used to analyze the hydrodynamic characteristics of various floating bridges under the action of water waves. Then, taking Jiyue railway boat bridge of Jingshan line as an engineering example, the dynamic characteristics of the six or seven type railway boat bridge are analyzed by using the method deduced in the previous paper, and the wave height, for example, is discussed. The influence of the variation of wave parameters such as circular frequency and incident wave angle on the floating bridge. Finally, the hydrodynamic characteristics of the pontoon bridge under the combined action of water wave and train load are studied. At the same time, the on-load of the pontoon bridge under different axle loads and different speeds is discussed.
【学位授予单位】：石家庄铁道大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441.3
【参考文献】
相关期刊论文 前1条
1 辛实;铁路浮桥结构的整体分析[J];铁道建筑技术;1995年03期
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