大纵坡柔性高墩连续梁桥交接墩偏位控制研究

发布时间：2018-01-27 10:04

本文关键词： 山区高速公路桥梁大纵坡柔性高墩交接墩偏位病害非线性分析施工监控　出处：《湖南大学》2015年硕士论文　论文类型：学位论文

【摘要】：近年来,随着国家西部大开发战略的深入,中西部地区的高速公路得到了空前发展。我国西部地区地形以高原、盆地、山地为主,地质条件复杂。山区高速公路桥梁平纵线形受地形的影响突出,曲线、大纵坡、高墩成为山区高速公路桥梁的主要特点。大纵坡柔性高墩连续梁桥的交接墩偏位病害已在多条山区高速公路桥梁上出现,几乎成为一种普遍性的病害。目前,国内外对这一问题的研究较少,对病害产生的原因观点不一,对病害产生后的处治方法研究也较少。本文以某高速公路上出现该种病害的红阳大桥为背景,对交接墩偏位病害产生的原因、病害桥墩的安全性、偏位桥墩的纠偏施工及监控等关键技术进行了较深入研究。首先建立全桥有限元模型,按简支梁体系、简支转换连续梁、施工车辆通行三个阶段对偏位病害形成过程进行了分析。结果表明：支座安装不水平是导致桥墩偏位的根本原因,上部结构恒载、活载和温度荷载等作用在不水平支座上,造成或加剧桥墩偏位。为研究桥墩偏位对桥梁结构性能的影响,编制了桥墩受力性能的非线性全过程分析程序,对偏位状态下桥墩的受力变形状态进行了评估,对偏位桥墩的抗压承载能力进行了分析,对偏位桥墩纠偏完成和加固后的抗推承载能力进行了验算。从病害处治的角度出发,对红阳大桥桥墩予以纠偏和加固并进行全过程施工监控,对纠偏和加固后桥墩的状态分别进行了连续观测和长期监测。纠偏过程中,上部结构基本保持静止状态,桥墩受力均匀,结构安全；纠偏后纠偏桥墩竖直度和伸缩缝宽度都随温度周期性变化,桥墩及支座的工作状态良好,桥墩纠偏和加固取得了良好的效果。通过对红阳大桥交接墩偏位成因分析、桥墩受力性能非线性分析及桥墩纠偏施工监控,分析了大纵坡连续梁桥柔性高墩偏位病害的主要原因及其对结构受力性能的影响,获得了有价值的研究结论,并提出了有效的处治方法和建议,可供类似工程病害处治参考。
[Abstract]:In recent years, with the development of the national western development strategy, the highway in the central and western regions has been unprecedented development. The topography of the western region of China is mainly plateau, basin and mountain. The geological conditions are complex. The horizontal and vertical lines of highway bridges in mountainous areas are influenced by the topography, the curves and the large vertical slopes. High piers have become the main characteristics of highway bridges in mountainous areas. The bridge with large longitudinal slope flexible high pier continuous beam bridge has appeared on many mountain highway bridges and has almost become a universal disease. There are few researches on this problem at home and abroad, different views on the causes of the disease, and less research on the treatment methods after the disease. The background of this paper is the Hongyang Bridge, where the disease occurs on a certain expressway. In this paper, the causes of the defect of the bridge bridge pier, the safety of the bridge pier, the construction and monitoring of the bridge pier are studied deeply. Firstly, the finite element model of the bridge is established, and the system of simply supported beam is established. The formation process of the deflection disease is analyzed in the three stages of simply supported transfer continuous beam and construction vehicle. The results show that the non-horizontal support installation is the fundamental cause of the bridge pier deviation and the superstructure is dead. The effects of live load and temperature load on the unhorizontal support cause or aggravate the deflection of the pier. In order to study the influence of the deflection of the pier on the performance of the bridge structure, a nonlinear full-process analysis program for the mechanical behavior of the pier is developed. The stress and deformation state of the pier is evaluated and the bearing capacity of the eccentric pier is analyzed. The anti-pushing capacity of the bridge pier after rectifying and strengthening is checked and calculated. From the point of view of disease treatment, the bridge pier of Hongyang Bridge is rectified and strengthened, and the whole process construction monitoring is carried out. Continuous observation and long-term monitoring of the state of the bridge pier after rectifying and strengthening are carried out. In the process of rectifying deviation, the superstructure basically remains static, the force of the pier is uniform, and the structure is safe. After rectifying the deviation, the vertical degree and the width of the expansion joint change periodically with the temperature, and the working condition of the pier and the support is good. The bridge pier deviation correction and reinforcement have achieved good results. Through the analysis of the causes of bridge pier deflection, the nonlinear analysis of pier force performance and the monitoring of bridge pier deviation correction construction. This paper analyzes the main causes of the deflection disease of flexible high piers of large longitudinal slope continuous girder bridge and its influence on the mechanical performance of the structure, obtains valuable research conclusions, and puts forward effective treatment methods and suggestions. It can be used as a reference for the treatment of similar engineering diseases.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445.71

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