西北干寒地区常见病害对公路桥梁可靠性的影响

发布时间：2018-04-10 17:28

本文选题：干寒地区 + 可靠度　；参考：《兰州交通大学》2014年硕士论文

【摘要】：西北干寒地区主要指中国气候寒冷、干旱地区，该地区主要分布在中国西北部，主要包括新疆全部区域、甘肃省大部区域、青海省全部地区、宁夏全部区域、陕西省北部地区以及内蒙古西部、青藏高原北部和东北部地区，气候寒冷干燥。由于这些地区气候的特殊性，该地区公路桥梁经常出现单板受力、裂缝和冻融等病害。严重影响了桥梁正常服役，给行车安全增添了隐患。因此，研究西北干寒地区公路桥梁可靠性的意义尤为重要。本文结合连霍高速古浪-瓜州段高速公路混凝土梁桥为工程背景，结合西北干寒地区寒冷季节长、冰冻期长、年温差和天温差大的气候及环境特点；采用理论分析、数值仿真及现场试验的方法，对跨越沙漠及季节性冻土区的混凝土和钢筋混凝土梁桥的病害机理及其对混凝土梁桥可靠性的影响进行分类研究并提出梁桥病害处置及养护的关键技术；通过梁桥病害的数据采集及观测研究，提出干寒地区混凝土梁桥可靠性预测模型及养护技术，得出评价混凝土梁桥的可靠性的实用理论和技术方法。计算结构可靠度指标、数值模拟，来研究病害对桥梁结构可靠性的影响，总结一些桥梁病害监测、加固方法应用于西北干寒地区公路桥梁中。本文主要进行了以下工作： (1)现场调查并查阅相关资料，介绍裂缝、单板受力现象产生的原因，总结西北干寒地区病害类型； (2)结合先前研究成果，总结裂缝、单板受力病害的机理； (3)桥梁结构可靠度理论知识的研究； (4)结合裂缝计算理论，研究裂缝对钢筋锈蚀直至可靠度的影响； (5)应用有限性软件模拟板梁桥单板受力模型； (6)分析单板受力现象对桥梁可靠度的影响； (7)结合桥梁检测加固技术，提出针对连霍国道(古浪-瓜州)K241+864中桥的病害监测及防治技术。
[Abstract]:The dry and cold regions of northwest China mainly refer to the cold and arid regions of China. This region is mainly distributed in northwest China and mainly includes all regions of Xinjiang, most regions of Gansu Province, all regions of Qinghai Province, and all regions of Ningxia.The northern part of Shaanxi Province and the western part of Inner Mongolia, the northern and northeast parts of Qinghai-Xizang Plateau have a cold and dry climate.Due to the particularity of climate in these areas, the highway bridges in this area often suffer from veneer stress, cracks and freeze-thaw diseases.It seriously affects the normal service of the bridge and increases the hidden danger to the driving safety.Therefore, it is very important to study the reliability of highway bridge in northwest dry and cold region.Based on the engineering background of concrete beam bridge of Lianghuo High-speed Gulang-Guazhou section of expressway, combined with the climatic and environmental characteristics of long cold season, long freezing period, annual temperature difference and great temperature difference in northwest dry and cold region, the paper adopts theoretical analysis.Methods of numerical simulation and field test,The damage mechanism of concrete and reinforced concrete beam bridge across desert and seasonal frozen soil region and its influence on reliability of concrete beam bridge are classified and studied. The key technologies for the treatment and maintenance of beam bridge disease are put forward.Based on the data collection and observation of beam bridge disease, the reliability prediction model and maintenance technology of concrete beam bridge in dry cold area are put forward, and the practical theory and technical method to evaluate the reliability of concrete beam bridge are obtained.The structural reliability index and numerical simulation are calculated to study the influence of the disease on the reliability of the bridge structure. Some bridge disease monitoring and reinforcement methods are summarized and applied to the highway bridges in the dry and cold region of northwest China.The main work of this paper is as follows:1) investigating and consulting relevant data, introducing the causes of cracks and veneer force phenomena, and summarizing the types of diseases in the dry and cold areas of Northwest China;(2) combined with previous research results, the mechanism of crack and veneer stress disease is summarized.(3) Research on the theoretical knowledge of bridge structure reliability;(4) combined with fracture calculation theory, the influence of crack on the corrosion and reliability of steel bar is studied.5) the finite software is used to simulate the single plate force model of slab girder bridge.6) analyzing the influence of veneer force on bridge reliability.Combined with bridge inspection and strengthening technology, the disease monitoring and prevention technology of Lianghuo National Road (Guanlang-Guazhuan K241 864) Bridge is put forward.
【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.71

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