独塔空间主缆自锚式悬索桥缆索系统施工计算分析
发布时间：2018-08-03 20:01
【摘要】：随着计算理论和桥梁施工技术的进步,独塔空间主缆自锚式悬索桥被越来越多地应用到工程实践中。本文以江西上饶大桥为工程实例,对独塔空间主缆自锚式悬索桥缆索悬吊系统进行结构分析和施工技术探讨。 成桥吊索索力的计算以及主缆线形的确定是空间主缆自锚式悬索桥设计的难点,本文着重关注加劲梁的合理受力状态,探讨吊索索力的优化计算方法。在吊索力确定以后,结合索段数值分析法和非线性有限元法可以得到自锚式悬索桥主缆的线形和无应力索长。该方法简单易行,可以应用于空间主缆自锚式悬索桥的初步设计计算。以江西上饶大桥为例,验证该方法的有效性。 主缆架设施工是空间主缆自锚式悬索桥施工的关键步骤。以江西上饶大桥为例,研究主缆基准索股放样、吊索索夹横向安装角度确定的问题,以及如何消除主缆索股的鼓丝和扭丝现象。近似以抛物线模拟基准索股线形,推导出主缆温度以及主缆两端点水平跨度、高差变化时,索股线形变化的计算公式。根据实际工程情况分析主缆鼓丝和扭丝的原因并提出相应的处理办法。借鉴以往工程实例,得到一种简易的索夹横向安装角度的确定办法。 自锚式悬索桥体系转换过程中,吊索张拉方案的优化关系到结构的受力状态是否合理,关系到结构本身和施工的安全性。吊索张拉方案确定的重点在于吊索张拉力大小的准确计算,由于主缆在吊索张拉过程中表现出几何非线性,发生大位移,主缆索夹点和主梁锚固点之间的吊索长度也随主缆发生了远大于其弹性变形的变化。这样的受力特性使吊索在张拉过程中张拉力和长度的计算变得困难,本文提出等效节点力法计算吊索张拉力以及相应张拉力的吊索长度。等效节点力法是将吊索对主缆和主梁的拉力等效为节点力,通过迭代计算得到桥梁的平衡状态,继而得到吊索张拉力和长度。 以江西上饶大桥为工程实例,采用等效节点力法探讨独塔空间主缆自锚式悬索桥体系转换的吊索张拉顺序、张拉力的优化,确定鞍座顶推方案,对吊索张拉过程中桥梁主要构件的受力状态进行分析,相应结论可以为同类型桥梁提供借鉴。
[Abstract]:With the development of calculation theory and bridge construction technology, self-anchored suspension bridge with single tower space main cable is more and more used in engineering practice. Taking Shangrao Bridge in Jiangxi Province as an engineering example, the structure analysis and construction technology of cable suspension system of single tower space main cable self-anchored suspension bridge are discussed in this paper. The calculation of the cable force and the determination of the main cable shape are the difficulties in the design of the space main cable self-anchored suspension bridge. This paper focuses on the reasonable stress state of the stiffened beam and discusses the optimization calculation method of the cable force. After the cable force is determined, the linear shape and unstressed cable length of the main cable of self-anchored suspension bridge can be obtained by combining the numerical analysis of cable segment and nonlinear finite element method. The method is simple and practical and can be applied to the preliminary design and calculation of space main cable self-anchored suspension bridge. Taking Shangrao Bridge in Jiangxi Province as an example, the effectiveness of the method is verified. The construction of main cable erection is a key step in the construction of space main cable self-anchored suspension bridge. Taking Shangrao Bridge in Jiangxi Province as an example, this paper studies the problems of setting out the standard cable strands of the main cable, determining the lateral installation angle of the cable clips, and how to eliminate the phenomenon of the bulging and twisting of the main cable strands. The parabola is used to simulate the basic cable strands, and the formula for calculating the main cable temperature, horizontal span and height difference between the two ends of the main cable is derived. According to the actual engineering situation, the causes of main cable drum wire and twisting wire are analyzed and the corresponding treatment methods are put forward. A simple method for determining the angle of transverse installation of cable clamps is obtained by referring to previous engineering examples. In the process of system transformation of self-anchored suspension bridge, the optimization of sling tension scheme is related to whether the stress state of the structure is reasonable or not, and to the safety of the structure itself and construction. The emphasis of the determination of the tension scheme of the sling lies in the accurate calculation of the tension force of the sling. Due to the geometric nonlinearity of the main cable during the stretching of the sling, a large displacement occurs. The length of the sling between the clamping point of the main cable and the anchor point of the main beam also changes with the elastic deformation of the main cable. This force makes it difficult to calculate the tension and length of the sling during the process of tension. In this paper, the equivalent nodal force method is proposed to calculate the tension of the sling and the length of the sling of the corresponding tension. The equivalent node force method is that the tension of the sling to the main cable and the main beam is equivalent to the node force, and the equilibrium state of the bridge is obtained by iterative calculation, and then the tension and the length of the sling are obtained. Taking Shangrao Bridge in Jiangxi Province as an engineering example, using the method of equivalent nodal force, this paper discusses the tension sequence and tension optimization of the system conversion of the single tower space main cable self-anchored suspension bridge, and determines the scheme of saddle jacking. The stress state of the main components of the bridge in the process of sling tension is analyzed, and the corresponding conclusions can be used for reference for the same type of bridge.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.25;U445.4
[Abstract]:With the development of calculation theory and bridge construction technology, self-anchored suspension bridge with single tower space main cable is more and more used in engineering practice. Taking Shangrao Bridge in Jiangxi Province as an engineering example, the structure analysis and construction technology of cable suspension system of single tower space main cable self-anchored suspension bridge are discussed in this paper. The calculation of the cable force and the determination of the main cable shape are the difficulties in the design of the space main cable self-anchored suspension bridge. This paper focuses on the reasonable stress state of the stiffened beam and discusses the optimization calculation method of the cable force. After the cable force is determined, the linear shape and unstressed cable length of the main cable of self-anchored suspension bridge can be obtained by combining the numerical analysis of cable segment and nonlinear finite element method. The method is simple and practical and can be applied to the preliminary design and calculation of space main cable self-anchored suspension bridge. Taking Shangrao Bridge in Jiangxi Province as an example, the effectiveness of the method is verified. The construction of main cable erection is a key step in the construction of space main cable self-anchored suspension bridge. Taking Shangrao Bridge in Jiangxi Province as an example, this paper studies the problems of setting out the standard cable strands of the main cable, determining the lateral installation angle of the cable clips, and how to eliminate the phenomenon of the bulging and twisting of the main cable strands. The parabola is used to simulate the basic cable strands, and the formula for calculating the main cable temperature, horizontal span and height difference between the two ends of the main cable is derived. According to the actual engineering situation, the causes of main cable drum wire and twisting wire are analyzed and the corresponding treatment methods are put forward. A simple method for determining the angle of transverse installation of cable clamps is obtained by referring to previous engineering examples. In the process of system transformation of self-anchored suspension bridge, the optimization of sling tension scheme is related to whether the stress state of the structure is reasonable or not, and to the safety of the structure itself and construction. The emphasis of the determination of the tension scheme of the sling lies in the accurate calculation of the tension force of the sling. Due to the geometric nonlinearity of the main cable during the stretching of the sling, a large displacement occurs. The length of the sling between the clamping point of the main cable and the anchor point of the main beam also changes with the elastic deformation of the main cable. This force makes it difficult to calculate the tension and length of the sling during the process of tension. In this paper, the equivalent nodal force method is proposed to calculate the tension of the sling and the length of the sling of the corresponding tension. The equivalent node force method is that the tension of the sling to the main cable and the main beam is equivalent to the node force, and the equilibrium state of the bridge is obtained by iterative calculation, and then the tension and the length of the sling are obtained. Taking Shangrao Bridge in Jiangxi Province as an engineering example, using the method of equivalent nodal force, this paper discusses the tension sequence and tension optimization of the system conversion of the single tower space main cable self-anchored suspension bridge, and determines the scheme of saddle jacking. The stress state of the main components of the bridge in the process of sling tension is analyzed, and the corresponding conclusions can be used for reference for the same type of bridge.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.25;U445.4
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