独塔钢箱梁自锚式悬索桥施工控制

发布时间：2018-03-10 10:14

本文选题：独塔钢箱梁　切入点：自锚式悬索桥　出处：《南京林业大学》2014年硕士论文　论文类型：学位论文

【摘要】：自锚式悬索桥由于其外观优美、适应能力强等优点而越来越受到桥梁设计师的青睐，但由于自身的受力特点以及施工顺序不同于地锚式悬索桥而给设计和施工带来许多难点，特别是对于体系转换过程的施工控制尤为复杂。本文首先总结了自锚式悬索桥的发展概况和计算分析理论，然后以某独塔钢箱梁自锚式悬索桥为工程背景，对自锚式悬索桥施工控制进行了研究，具体内容包括以下几个方面：（1）根据自锚式悬索桥合理成桥状态目标原则，通过有限元软件Midas/Civil确定自锚式悬索桥的合理成桥状态模型。（2）根据分段悬链线理论，通过解析程序编写，计算空缆线形，并与有限元软件倒拆的空缆线形进行对比，验证有限元软件得出的空缆模型正确性。在空缆模型的基础上，研究温度对主缆线形的变化影响。在现场主缆架设过程中，采用力与位移双控制的方法来保证主缆索股线形架设的准确程度。（3）结合某独塔钢箱梁自锚式悬索桥体系转换过程，提出了“吊杆交替张拉”方案，相对于传统的对称张拉，解决了在张拉过程中避免单个吊杆出现过大的张拉力而影响相邻的吊杆索力衰减，甚至为零的问题。分析在张拉过程中自锚式悬索桥的受力特点和变形特征，并对吊杆的加工长度进行计算。（4）将“吊杆交替张拉”方案用于该实桥，对悬索桥体系转换过程进行施工控制监测，实测结果表明：主缆和加劲梁线形与目标状态相一致，吊杆索力均匀，与成桥设计索力误差基本控制在3%以内，说明对该自锚式悬索桥的施工控制效果良好。本文通过理论分析和对现场过程的施工控制，顺利完成该桥的体系转换，，可以为同类型自锚式悬索桥的施工控制分析提供参考价值。
[Abstract]:Self anchored suspension bridge because of its beautiful appearance, strong adaptability and more and more bridge designers, but because of their mechanical characteristics and construction sequence is different from the earth anchored suspension bridge design and construction and brings many difficulties, especially for the construction of the system conversion process control is very complicated.
This paper first summarizes the development and the theory of computation and analysis of self anchored suspension bridge. Then taking a single tower steel box girder self anchored suspension bridge as the engineering background, the construction control of self anchored suspension bridge is studied, including the following aspects.
(1) the reasonable bridge state model of self anchored suspension bridge is determined by the finite element software Midas/Civil, according to the principle of the rational bridge state target of self anchored suspension bridge.
(2) according to the catenary theory, through the analytical program, the calculation of cable shape, cable shape and backward with the finite element software and compared to verify the correctness of the model of cable finite element software obtained. Based on the empty cable model, the effect of temperature on the alignment of the main cable is in the main effect. The cable erection process, method adopts the double control force and displacement of the main cable to ensure the accuracy of linear shares of erection.
(3) with a single tower steel box girder self anchored suspension bridge system conversion process, put forward the "alternate tension boom" program, compared with the traditional symmetrical tension, solved in the tensioning process to avoid a single suspender tension appeared large and the influence of adjacent Suspender Force attenuation, or zero. By analyzing the stress characteristics and deformation features in the tensioning process of self anchored suspension bridge, and to calculate the length of processing boom.
(4) the "boom alternating stretching scheme for the bridge, construction control of suspension bridge monitoring system conversion process, the test results show that the consistent alignment of the main cable and the stiffening girder and the target state, the suspender force uniform, and the bridge design of cable force error control in 3%. The good on the self anchored suspension bridge construction control effect.
Through theoretical analysis and construction control of site process, the system transformation of the bridge is successfully completed, which can provide reference value for construction control analysis of the same type self anchored suspension bridge.

【学位授予单位】：南京林业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.4;U448.25

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