【摘要】：隨著國民經濟的飛速發(fā)展,公路和城市道路的運輸量和貨物周轉量大幅度增長,車輛的載重噸位和車流密度增長也相當迅速。公路橋梁的病害與損傷導致其承載能力降低、使用性能下降的現象日益普遍。對于存在病害的梁橋,各種損傷、病害對構件性能的影響如何考慮,目前尚沒有統(tǒng)一的標準和方法,只能根據破壞程度按經驗進行折減和粗略估算,計算精度不高。對于帶病害的橋梁結構的地震響應分析,可以參考的資料及文獻很少。我國是一個地震頻發(fā)的國家,故受損橋梁結構的抗震性能的研究就具有更加重要的工程實際意義。 為了準確得出病害結構對梁橋結構地震響應的影響,本文首先對各類型的典型病害成因、作用機理和其對承載能力、耐久性等使用性能的影響進行分析,總結了橋梁病害和其結構性能的衰減關系,并指出目前鋼筋混凝土梁橋影響其結構性能以及承載能力的病害主要是混凝土碳化以及碳化引起的鋼筋銹蝕。本文建立了銹蝕鋼筋混凝土構件的時變模型,隨著鋼筋銹蝕量的增加,其屈服強度和極限強度下降明顯,即銹蝕鋼筋使橋墩的強度和塑性性能均有下降,導致結構從有預兆的塑性破壞向脆性破壞轉化。然后利用OpenSees對銹蝕橋墩進行了地震荷載下的非線性時程分析。對比分析結果可知：在地震波加載下,鋼筋銹蝕對橋墩的位移響應影響略有增加,而對內力響應影響較大,即銹蝕鋼筋降低了橋墩的強度、延性、變形性能和耗能能力,繼而使其抗震性能下降。 本論文來源于云南省交通廳科技基金項目,“基于運營安全風險的云南公路橋梁危橋現狀分析與對策研究”,同時獲得該項目基金的資助。
[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.
【學位授予單位】：昆明理工大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U445.71

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