【作者】 郑晖；

【导师】 张哲； 黄才良；

【作者基本信息】 大连理工大学 ， 桥梁与隧道工程， 2004， 硕士

【摘要】 随着斜拉桥规模的不断增大，斜拉桥的施工监控显得越来越重要。作为施工监控的一个重要环节，应力的监控测试对于确保施工安全和合理成桥状态具有不容忽视的作用。 本文以红枫湖特大桥施工控制实践为背景，针对红枫湖特大桥的应力监控测试进行全面论述。 首先，本文分析了桥梁成桥阶段应力。计算过程中，考虑到现行桥梁设计规范中还没有关于斜拉桥桥面板有效宽度的明确规定，本文就这一问题建立了三维实体有限元模型进行研究，提出了红枫湖特大桥桥面板有效宽度的建议值。 其次，鉴于本桥要对混凝土结构进行长期实时监控，应变测量中采用了稳定性好、测量精度高并可进行温度观测的BGK～4200型振弦式应变计。由于测量所得的应变数据中包含非线性变化的混凝土徐变应变及收缩应变，因此本文在第五章中重点研究了如何分离应变测试结果中的徐变应变及收缩应变的问题。 最后，将现场的应力实时监测数据进行分析处理，并与理论值加以比较。其中针对横隔梁的计算提出了几种合理有效的计算方法，同时着重阐述了横隔梁的预应力储备问题。 另外，本文还就施工过程中横隔梁开裂问题建立空间模型进行分析，并为避免后续施工再出现类似问题提出了改进性建议，具有一定现实意义。 本文关于红枫湖特大桥应力监控测试结果的分析为本桥后续施工监控工作提供了实施依据，确保了施工的顺利进行。同时，本文所采用的应力分析方法也对其他类似桥梁的应力分析具有一定的参考价值。更多还原

【Abstract】 With the scale of cable-stayed bridge enlarging continuously, the c onstruction monitor becomes more and more important. As a significant process, the monitor test of stress has the momentous function of ensure the construction safe and the normal status of finished bridge.This paper is combined with the construction monitor of the Hong Feng Lake Specially Long Span Bridge engineering, and discuss the monitor test of stress in detail.Firstly, analyze the main girder stress in different stage in the paper. Because there is no definite define about diaphragm effective with of cable-stayed bridge in current code for design of bridge, a three-dimensional finite element model is built in this paper to research the problem, and a prepositional value is put forward for diaphragm effective with of the Hong Feng Lake Specially Long Span Bridge.Secondly, choose the vibrating string extensometer BGK-4200, which can observe the temperature and has the character of high stability and precision, to monitor the concrete structure in the engineering for a long term. Because the measure strain data include the concrete creep strain and contraction strain, so the paper mainly researches how to depart them from the actual measure results in chapter five.Finally, analyze the real-time stress monitor data, and compare it with the theoretical value. Also propose some rational and effective calculation methods about cross beam calculation, and expound the problem of prestress reserve.Otherwise, build a spatial model to analyze the problem of cross beam crack in the course of building, and put forward the improved suggestion to avoid occurring the similar trouble. It would have the real meaning.In this paper, the analysis about the stress monitor test of Hong Feng Lake Specially Long Span Bridge engineering would offer a base for the future to ensure the construction proceed favourably. At the same time, the stress analysis method in this paper has the reference merit to other type bridges.更多还原