自适应悬臂施工控制

发布时间：2018-01-24 23:38

本文关键词： 连续梁桥悬臂施工仿真分析自适应控制灰色理论　出处：《华北水利水电大学》2015年硕士论文　论文类型：学位论文

【摘要】：目前,预应力混凝土连续刚构桥已迅速成为我国桥梁建设的主要桥型之一,施工方法也更倾向于使用自架设体系、不影响桥下交通的悬臂施工方法。对于采用此施工方法的桥梁来说,在施工过程中会受到多种因素的影响,使得桥梁结构的线形和内力状态会不断变化,为了确保成桥时的实际与理论状态趋于一致,因此,对悬臂浇筑的预应力混凝土梁桥进行施工控制就显得尤为重要。本文结合焦作市“沁河大桥”改建项目的设计要求和施工特点,决定采用自适应控制方法进行全桥的施工控制。具体实施过程,首先依托有限元软件Midas/Civil对该桥的施工过程进行仿真分析,获取每个典型施工阶段的挠度和应力理论值,并在施工过程中通过测量得到实测值,从而进行理论与实测值对比分析,进而在模型中修正参数值,综合分析得出下一节段的立模标高,以此类推,直至全桥合拢。为了使成桥线形达到设计预期,针对已施工完毕梁段无法消除的误差,对下一节段的状态预测就成为了关键。本文借助可用来进行结构状态预测和估计的灰色控制理论,并将其应用于主梁预拱度的预测中,从实测和预测结果分析来看,灰色控制理论对结构状态预测的效果显著,从而使得结构计算、施工监控、误差调整和状态预测构成了完整的自适应控制体系。基于自适应控制方法的合理开展,保证了成桥时结构状态达到了设计预期,施工过程顺利而高效,同时,本文的研究工作,也为今后同类型及相似桥梁的施工监控提供了参考。
[Abstract]:At present, prestressed concrete continuous rigid frame bridge has rapidly become one of the main bridge types in bridge construction in China, and the construction method is more inclined to use self-erection system. The cantilever construction method does not affect the traffic under the bridge. For the bridge which adopts this construction method, it will be affected by many factors in the construction process, making the structure of bridge linear and internal force state will change constantly. In order to ensure that the actual and theoretical state of the bridge tend to be consistent, therefore. It is particularly important to control the construction of the cantilever cast prestressed concrete beam bridge. This paper combines the design requirements and construction characteristics of the reconstruction project of "Qinhe Bridge" in Jiaozuo City. It is decided to adopt adaptive control method to control the construction of the whole bridge. In the concrete implementation process, the construction process of the bridge is simulated and analyzed based on the finite element software Midas/Civil. The theoretical values of deflection and stress in each typical construction stage are obtained, and the measured values are obtained by measuring during the construction process, so that the theoretical and measured values are compared and analyzed, and then the parameter values are revised in the model. Comprehensive analysis of the next section of the vertical model elevation, and so on, until the whole bridge closed. In order to make the bridge line to meet the design expectations, for the completed construction of the beam section can not eliminate the error. In this paper, the grey control theory which can be used to predict and estimate the structure state is used to predict the pre-camber of the main beam. From the analysis of the measured and predicted results, the grey control theory has a remarkable effect on the structure state prediction, thus making the structure calculation and construction monitoring. Error adjustment and state prediction constitute a complete adaptive control system. Based on the reasonable development of adaptive control method, the structural state of the bridge is up to the design expectation, the construction process is smooth and efficient, and at the same time. The research work of this paper also provides a reference for the construction monitoring of the same type and similar bridges in the future.
【学位授予单位】：华北水利水电大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445.4

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