薄壁高墩连续刚构桥梁施工控制分析

发布时间：2018-06-25 15:21

本文选题：桥梁监控 + 灰色理论　；参考：《华北水利水电大学》2017年硕士论文

【摘要】：新世纪以来,随着国家对交通基础设施建设投入的逐步加大和桥梁施工技术的飞速发展,我国建设的高墩大跨桥梁高度、跨度不断刷新桥梁建设记录。连续刚构桥不但继承了连续梁桥曲线平缓,伸缩缝少,行车舒适的特点和T形刚构体系桥梁整体性能好,结构刚度大,变形小的优点,而且可以减小跨中弯矩绝对值,从而降低主梁高度减少材料用量提高材料利用率。随着桥梁结构形式不断向高墩大跨发展,薄壁高墩这种结构形式脱颖而出,它相对于实心墩柔度增大而且容易受不平衡荷载及环境变化影响,对施工控制要求较高,施工控制日益成为设计和施工中的关键。本文以湖南高速黑垅大桥桥梁监控项目为工程背景讲行了研究。1、首先描述了大跨径桥梁监控技术的历史和现状,阐述了施工控制技术常见的理论方法和在工程中的实际应用。2、文中采集的施工过程中结构变形及主要控制断面截面应力等数据,采用最小二乘法对模型仿真理论所取参数值调整,使设定的参数值更接近于实际并对理论算法进行了阐述。3、结合实际工程黑垅大桥项目,利用灰色系统理论进行下阶段预测,以实测数据和理论模型为依据,对该桥的线形进行控制,将理论值、实测值、预测值进行比较,结果表明效果较为理想。4、由于黑垅大桥具有曲线桥梁、薄壁高墩、大跨连续刚构等特点,所以对温度敏感性较高。温度荷载对悬臂浇筑连续梁桥有很大影响,综合温度对桥墩及主梁的应变及内力影响选择对桥梁因温度产生次应力相对较小的合理合龙温度。最后本文为方便后续研究,对研究内容进行了总结和展望。
[Abstract]:Since the new century, with the gradual increase of the country's investment in infrastructure construction and the rapid development of bridge construction technology, the high pier and span of the construction of our country constantly refresh the bridge construction records. The continuous rigid frame bridge not only inherits the slow curve of the continuous beam bridge, the expansion joint is few, the driving comfort characteristics and the T shape rigid frame system. The bridge has the advantages of good overall performance, large structural stiffness and small deformation, and can reduce the absolute value of the bending moment in the span, thus reducing the height of the main beam and reducing the material utilization. With the continuous development of the bridge structure to the high pier and large span, the structure form of the thin-walled high pier is outstanding, and its flexibility is increased and the capacity is larger than the solid pier. It is easy to be affected by unbalanced load and environmental change, which has higher requirements for construction control, and construction control is becoming the key in design and construction. This paper takes the monitoring project of Hunan high speed black ridge bridge as the background of the project, and describes the history and present situation of the long-span bridge monitoring technology, and expounds the construction control technology. The theoretical method and practical application in engineering,.2, the data of structural deformation and main section stress in the control section during the construction process, the parameter values of model simulation are adjusted by the least square method, the set parameters are closer to the reality and the theory algorithm is expounded.3, combined with the actual engineering black ridge. The bridge project, using the grey system theory to predict the next stage, based on the measured data and theoretical model, compares the line shape of the bridge, and compares the theoretical value, the measured value and the predicted value. The results show that the effect is more ideal.4, because the black ridge bridge has the characteristics of curved bridge, thin wall high pier and large span continuous rigid frame. The temperature load has a great influence on the cantilever casting continuous beam bridge. The influence of the temperature on the strain and the internal force of the bridge pier and the main beam and the internal force of the bridge is selected for the reasonable closing temperature which is relatively small for the secondary stress caused by the temperature. Finally, this paper makes a summary and Prospect of the research content.
【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】：2017
【分类号】：U445.4

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