连续刚构桥施工监控仿真及施工阶段稳定性分析

发布时间：2018-03-02 09:03

本文关键词： 连续刚构桥施工仿真施工监控稳定性　出处：《重庆大学》2014年硕士论文　论文类型：学位论文

【摘要】：连续刚构桥是T型刚构和连续梁相结合的一种梁式桥梁体系。凭借其优越的受力特性、良好的经济效益及平稳舒适的行车条件等优点，在国内外桥梁建设中得到了日益广泛的应用。连续刚构桥无论在施工阶段还是在运营阶段，质量和安全都应得到充分的保障，结构线形和受力状态都应满足设计要求，尤其是在悬臂施工过程中时，桥梁处于静定状态，防线单一，结构安全与稳定容易受到威胁。因此，对连续刚构桥进行施工监控是很有必要的。本文以喇嘛寺沟大桥为工程背景，，来研究连续刚构桥的施工监控问题，以下是本文研究的主要内容及得到的相关结论： ①以位移有限元方法为基础研究与桥梁施工监控仿真分析相关的理论。明确了喇嘛寺沟大桥需要实施施工监控的主要项目及桥梁施工监控的分析与计算方法，建立桥梁施工监控系统并阐述了影响桥梁施工监控的因素。 ②运用桥梁结构分析软件CSB和MIDAS/Civil建立大桥的有限元模型，对其施工全过程进行模拟计算。将两个软件的计算结果进行分析和校核，结合已有的工程经验，认为喇嘛寺沟大桥的线形、内力和应力等仿真结果是可靠和有效的，可用来对大桥实施现场施工监控。 ③按照既定的施工监控方案对大桥实施现场监控工作，着重阐述大桥在实际施工过程中几何线形和截面应力的控制要点，并将监控成果进行分析。线形控制方面，主梁标高误差控制在±9mm范围内，中线偏位控制在±8mm范围内，最终实现了大桥的高精度合龙；应力控制方面，截面实测与理论应力误差基本控制在±1MPa范围内，结果合理，结构应力利用空间充分。 ④对大桥实施施工阶段稳定性分析的必要性进行了阐述，利用MIDAS/Civil中的屈曲分析模块分别计算了1号墩处于裸墩状态和最大悬臂状态时，结构在不同工况作用下的临界荷载系数，再根据计算结果提出了保证结构在施工阶段中安全稳定的建议和措施。结果表明，结构在各荷载工况作用下均不存在失稳问题，桥梁安全稳定可以得到保障。
[Abstract]:Continuous rigid frame bridge is a girder bridge system T type rigid frame and continuous beam combination. By virtue of its excellent mechanical properties, good economic benefits and comfortable driving conditions and other advantages, is widely used in bridge engineering at home and abroad. Both in the continuous rigid frame bridge construction stage or in the operation stage quality and safety, should be adequately protected, the structure force and linear state should meet the design requirements, especially in the cantilever construction process, the bridges are in static state, single line, structure safety and stability of vulnerable. Therefore, the continuous rigid frame bridge construction monitoring is necessary.
In this paper, the construction monitoring problem of continuous rigid frame bridge is studied under the background of Lama Valley Bridge. The following are the main contents and conclusions of this paper.
With the displacement finite element method based on bridge construction monitoring and simulation analysis of related theory. The analysis and calculation method of main bridge construction monitoring project and the Lama Sigou bridge requires the implementation of construction monitoring, the establishment of bridge construction monitoring system and discusses the influencing factors of the bridge construction monitoring.
The use of bridge structure finite element analysis software CSB and MIDAS/Civil to establish the bridge model, the whole construction process was simulated. The calculation results of the two software analysis and verification, combined with the existing engineering experience, that the linear Lama Temple ditch bridge, internal force and stress of the simulation results is reliable and effective. Can be used to implement the construction site monitoring of the bridge.
The implementation of on-site monitoring of bridge construction monitoring program in accordance with the established, focusing on the control points of stress bridge geometry in the actual construction process of linear and cross section, and the monitoring results are analyzed. The linear control, the elevation error is controlled within the range of 9mm, midline deviation is controlled within the range of 8mm, the final the closure of high precision bridge; stress control, measurement and theoretical section stress error is controlled within the range of 1MPa, the result is reasonable, full use of space structure stress.
The necessity of the analysis of the stability of construction stage of the bridge are described, the buckling analysis module in MIDAS/Civil were calculated at the pier No. 1 pier and the maximum cantilever state, the critical load coefficient of the structure in different conditions, according to the calculation result, put forward suggestions and measures to ensure the security and stability of the structure during the construction phase. The results show that the structure in different load conditions there are no instability problems, the bridge safety and stability can be guaranteed.

【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.23;U445.4

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