矮塔斜拉桥合理施工状态索力研究
发布时间：2019-01-28 19:46
【摘要】：矮塔斜拉桥是介于连续梁桥与斜拉桥之间的桥型,由索、塔、梁三种基本构件组成的缆索承重组合体系,形式多样、外形美观、跨越能力大,具有塔矮、梁刚、索集中等优点。矮塔斜拉桥也是施工工艺复杂、难度较大的一种桥型,确定合理施工状态对矮塔斜拉桥的施工过程中结构安全、主梁线形影响显著,斜拉索具有可调性,合理选择索力是矮塔斜拉桥施工过程中的关键问题。以常山矮塔斜拉桥工程为背景,建立Midas/Civil有限元模型对斜拉索进行索力分析计算。首先计算主梁的弯矩可行域,以主梁弯矩可行域验证设计成桥索力的合理性,并以设计成桥索力作为合理成桥状态索力,该组索力确定的成桥状态即是常山矮塔斜拉桥的合理成桥状态；然后以合理成桥状态为目标,结合实际施工状态在保证施工过程安全、合理的情况下,使用未知荷载系数正装分析求解合理施工过程中斜拉索的张拉力,进行施工阶段分析；最后使用压力法和频率法进行施工索力和成桥索力测试,检验施工索力和成桥索力是否满足设计要求。对常山矮塔斜拉桥的合理施工状态的索力进行研究,以未知荷载系数法确定合理施工状态的索力,为相关斜拉桥的施工索力求解提供参考,具有现实研究意义。
[Abstract]:The cable-stayed bridge with low tower is a bridge type between continuous girder bridge and cable-stayed bridge. It is composed of cable, tower and beam. It has many forms, beautiful appearance, large span ability, and has the advantages of low tower, rigid beam, concentrated cable and so on. The low tower cable-stayed bridge is also a kind of bridge with complex construction technology and great difficulty. Determining the reasonable construction state has significant influence on the structural safety of the cable-stayed bridge in the construction process, the main beam line shape is significant, and the cable-stayed cable is adjustable. The rational selection of cable force is the key problem in the construction process of the cable-stayed bridge with low tower. Based on the engineering of Changshan low tower cable-stayed bridge, the Midas/Civil finite element model is established to analyze and calculate the cable force. At first, the feasible region of bending moment of the main beam is calculated. The rationality of the designed cable force is verified by the feasible region of the bending moment of the main beam, and the cable force of the designed bridge is taken as the reasonable cable force in the state of the bridge. The bridge state determined by this group of cable forces is the reasonable bridge state of Changshan low tower cable-stayed bridge. Then, aiming at the reasonable state of the bridge, combining with the actual construction state to ensure the safety of the construction process, under reasonable conditions, the tension of the cable in the reasonable construction process is solved by using the normal load coefficient of unknown load analysis, and the construction stage analysis is carried out. Finally, the construction cable force and the bridge cable force are tested by using the pressure method and the frequency method to verify whether the construction cable force and the bridge cable force meet the design requirements. This paper studies the cable force of the reasonable construction state of Changshan low tower cable-stayed bridge. The method of unknown load coefficient is used to determine the rational construction state cable force, which provides a reference for the solution of the construction cable of the relevant cable-stayed bridge, and has practical significance.
【学位授予单位】：东北林业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445.4;U448.27
本文编号：2417260
[Abstract]:The cable-stayed bridge with low tower is a bridge type between continuous girder bridge and cable-stayed bridge. It is composed of cable, tower and beam. It has many forms, beautiful appearance, large span ability, and has the advantages of low tower, rigid beam, concentrated cable and so on. The low tower cable-stayed bridge is also a kind of bridge with complex construction technology and great difficulty. Determining the reasonable construction state has significant influence on the structural safety of the cable-stayed bridge in the construction process, the main beam line shape is significant, and the cable-stayed cable is adjustable. The rational selection of cable force is the key problem in the construction process of the cable-stayed bridge with low tower. Based on the engineering of Changshan low tower cable-stayed bridge, the Midas/Civil finite element model is established to analyze and calculate the cable force. At first, the feasible region of bending moment of the main beam is calculated. The rationality of the designed cable force is verified by the feasible region of the bending moment of the main beam, and the cable force of the designed bridge is taken as the reasonable cable force in the state of the bridge. The bridge state determined by this group of cable forces is the reasonable bridge state of Changshan low tower cable-stayed bridge. Then, aiming at the reasonable state of the bridge, combining with the actual construction state to ensure the safety of the construction process, under reasonable conditions, the tension of the cable in the reasonable construction process is solved by using the normal load coefficient of unknown load analysis, and the construction stage analysis is carried out. Finally, the construction cable force and the bridge cable force are tested by using the pressure method and the frequency method to verify whether the construction cable force and the bridge cable force meet the design requirements. This paper studies the cable force of the reasonable construction state of Changshan low tower cable-stayed bridge. The method of unknown load coefficient is used to determine the rational construction state cable force, which provides a reference for the solution of the construction cable of the relevant cable-stayed bridge, and has practical significance.
【学位授予单位】：东北林业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445.4;U448.27
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