混凝土梁式桥的病害及其对结构性能的影响分析
发布时间：2019-05-09 03:35
【摘要】：随着国民经济的飞速发展,公路和城市道路的运输量和货物周转量大幅度增长,车辆的载重吨位和车流密度增长也相当迅速。公路桥梁的病害与损伤导致其承载能力降低、使用性能下降的现象日益普遍。对于存在病害的梁桥,各种损伤、病害对构件性能的影响如何考虑,目前尚没有统一的标准和方法,只能根据破坏程度按经验进行折减和粗略估算,计算精度不高。对于带病害的桥梁结构的地震响应分析,可以参考的资料及文献很少。我国是一个地震频发的国家,故受损桥梁结构的抗震性能的研究就具有更加重要的工程实际意义。 为了准确得出病害结构对梁桥结构地震响应的影响,本文首先对各类型的典型病害成因、作用机理和其对承载能力、耐久性等使用性能的影响进行分析,总结了桥梁病害和其结构性能的衰减关系,并指出目前钢筋混凝土梁桥影响其结构性能以及承载能力的病害主要是混凝土碳化以及碳化引起的钢筋锈蚀。本文建立了锈蚀钢筋混凝土构件的时变模型,随着钢筋锈蚀量的增加,其屈服强度和极限强度下降明显,即锈蚀钢筋使桥墩的强度和塑性性能均有下降,导致结构从有预兆的塑性破坏向脆性破坏转化。然后利用OpenSees对锈蚀桥墩进行了地震荷载下的非线性时程分析。对比分析结果可知：在地震波加载下,钢筋锈蚀对桥墩的位移响应影响略有增加,而对内力响应影响较大,即锈蚀钢筋降低了桥墩的强度、延性、变形性能和耗能能力,继而使其抗震性能下降。 本论文来源于云南省交通厅科技基金项目,“基于运营安全风险的云南公路桥梁危桥现状分析与对策研究”,同时获得该项目基金的资助。
[Abstract]:With the rapid development of national economy, the traffic volume and cargo turnover of roads and urban roads have increased greatly, and the load tonnage and traffic flow density of vehicles have also increased rapidly. It is more and more common that the disease and damage of highway bridge lead to the decrease of bearing capacity and service performance. There is no uniform standard and method for considering the damage of beam bridge and how to consider the influence of the damage on the performance of beam bridge. It can only be reduced and roughly estimated according to the degree of damage. The accuracy of calculation is not high. Few references and references are available for seismic response analysis of bridge structures with disease. China is a country with frequent earthquakes, so the study of seismic performance of damaged bridge structures is more important in engineering practice. In order to obtain accurately the influence of the disease structure on the seismic response of the beam bridge structure, this paper first analyzes the causes of the typical diseases, the mechanism of action and its influence on the service performance of the bridge structure, such as bearing capacity, durability, and so on. This paper summarizes the relationship between bridge disease and its structural performance attenuation, and points out that the main diseases affecting the structural performance and bearing capacity of reinforced concrete beam bridges are carbonation of concrete and corrosion of steel bars caused by carbonation. In this paper, a time-varying model of corroded reinforced concrete members is established. With the increase of steel corrosion, the yield strength and ultimate strength decrease obviously, that is, the strength and plastic properties of bridge piers are decreased by corroded steel bars. It leads to the transformation of the structure from plastic failure with warning to brittle failure. Then the nonlinear time history analysis of corroded piers under seismic load is carried out by using OpenSees. The results of comparative analysis show that under the loading of seismic wave, the influence of steel bar corrosion on the displacement response of bridge pier increases slightly, while the influence on internal force response is greater, that is, the corroded steel bar reduces the strength, ductility, deformation performance and energy dissipation capacity of pier, and the steel bar corrosion can reduce the strength, ductility, deformation and energy dissipation capacity of pier. Then the seismic performance is reduced. This paper comes from the science and technology fund project of Yunnan Department of Communications, "Analysis and Countermeasures of dangerous Bridge of Highway Bridge in Yunnan Province based on Operation Safety risk", and receives the support of the project fund at the same time.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.71
本文编号：2472441
[Abstract]:With the rapid development of national economy, the traffic volume and cargo turnover of roads and urban roads have increased greatly, and the load tonnage and traffic flow density of vehicles have also increased rapidly. It is more and more common that the disease and damage of highway bridge lead to the decrease of bearing capacity and service performance. There is no uniform standard and method for considering the damage of beam bridge and how to consider the influence of the damage on the performance of beam bridge. It can only be reduced and roughly estimated according to the degree of damage. The accuracy of calculation is not high. Few references and references are available for seismic response analysis of bridge structures with disease. China is a country with frequent earthquakes, so the study of seismic performance of damaged bridge structures is more important in engineering practice. In order to obtain accurately the influence of the disease structure on the seismic response of the beam bridge structure, this paper first analyzes the causes of the typical diseases, the mechanism of action and its influence on the service performance of the bridge structure, such as bearing capacity, durability, and so on. This paper summarizes the relationship between bridge disease and its structural performance attenuation, and points out that the main diseases affecting the structural performance and bearing capacity of reinforced concrete beam bridges are carbonation of concrete and corrosion of steel bars caused by carbonation. In this paper, a time-varying model of corroded reinforced concrete members is established. With the increase of steel corrosion, the yield strength and ultimate strength decrease obviously, that is, the strength and plastic properties of bridge piers are decreased by corroded steel bars. It leads to the transformation of the structure from plastic failure with warning to brittle failure. Then the nonlinear time history analysis of corroded piers under seismic load is carried out by using OpenSees. The results of comparative analysis show that under the loading of seismic wave, the influence of steel bar corrosion on the displacement response of bridge pier increases slightly, while the influence on internal force response is greater, that is, the corroded steel bar reduces the strength, ductility, deformation performance and energy dissipation capacity of pier, and the steel bar corrosion can reduce the strength, ductility, deformation and energy dissipation capacity of pier. Then the seismic performance is reduced. This paper comes from the science and technology fund project of Yunnan Department of Communications, "Analysis and Countermeasures of dangerous Bridge of Highway Bridge in Yunnan Province based on Operation Safety risk", and receives the support of the project fund at the same time.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.71
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