【摘要】：斜拉橋是用若干根斜拉索將梁拉在塔柱上的橋。作為大跨徑橋梁的重要橋型之一,斜拉橋的設計、建設在全世界范圍內得到飛速發(fā)展,中國的斜拉橋建設也位居世界前列。然而,在早期建設的斜拉橋上,由于技術發(fā)展、原有設計等級過低、車輛荷載的不斷增加、施工水平有限、自然因素和人為因素的影響以及各種不可預測的材料變異等原因,導致橋梁的結構性能不斷減退,損傷不斷加大,原有的承載力不斷降低,斜拉索出現(xiàn)防護層失效、拉索銹蝕、斷裂、錨頭滲水等病害,無法滿足現(xiàn)有交通荷載等級要求,致使斜拉索達不到設計使用年限,提前換索。我國相關城市橋梁養(yǎng)護行業(yè)規(guī)范明文規(guī)定:只有當一根拉索內已經(jīng)斷裂的鋼絲面積超過該拉索鋼絲總面積的2%時,或者當一根拉索鋼絲銹蝕面積超過該拉索鋼絲總面積10%時,必須進行換索�，F(xiàn)階段,受檢查方法、檢查設備及檢查條件的限制,管養(yǎng)單位在日常檢查過程中,無法對拉索銹蝕情況進行全面的檢查,只能通過特殊檢查的方式來進行檢測。而具體的檢測方法、檢測指標尚無統(tǒng)一的規(guī)范標準。本文旨在從研究斜拉橋拉索病害情況出發(fā),通過日常檢查、特殊檢查以及對舊索進行實驗室檢測等手段,充分分析拉索病害情況,結合部分斜拉橋拉索病害特點及換索時間,探討拉索病害的影響因素,并總結管養(yǎng)經(jīng)驗。本課題擬通過對斜拉橋拉索病害的檢測方法、拉索各項性能檢測試驗的理論研究,并結合重慶李家沱長江大橋斜拉索的一系列試驗檢測分析,深入研究評估,對大橋斜拉索病害情況進行分析研究,提出建議,為大橋管養(yǎng)單位后期對斜拉索的維護方案提供指導依據(jù)。同時也為斜拉橋規(guī)范化管理以及斜拉橋的設計、施工提供改進的參考。
[Abstract]:The cable-stayed bridge is a bridge that pulls the beam on the column with a number of stay cables. As one of the important bridge types of long-span bridges, the design and construction of the cable-stayed bridge have been developed rapidly worldwide, and the construction of the cable-stayed bridge in China is in the forefront of the world. However, in the early construction of the cable-stayed bridge, due to the technical development, the original design level is too low, the load of the vehicle is increasing, the construction level is limited, the influence of the natural factors and the human factors and the various unpredictable material variations are caused, the structural performance of the bridge is reduced, The damage is increasing, the original bearing capacity is continuously reduced, the protective layer of the stay cable fails, the cable rust, the fracture, the anchor head seepage and other diseases can not meet the requirements of the existing traffic load grade, so that the stay cable can not reach the design service life, and the cable can be changed in advance. The relevant regulations of the relevant urban and bridge maintenance industry of our country are as follows: only when the area of the steel wire that has broken in one cable exceeds 2% of the total area of the cable steel wire, or when the corrosion area of a cable steel wire exceeds 10% of the total area of the cable steel wire, the cable change must be carried out. At the present stage, the inspection method, the inspection equipment and the inspection conditions are limited. In the course of daily inspection, the pipe maintenance unit can not conduct a comprehensive check on the rust of the cable, and can only be tested by special inspection. and the specific detection method and the detection index do not have a uniform specification standard. Based on the study of the cable disease of cable-stayed bridge, this paper, by means of daily inspection, special inspection and laboratory test to the old cable, fully analyzes the cable disease condition, and discusses the influence factors of the cable disease by combining the characteristics of the cable disease and the changing time of the cable-stayed bridge in the cable-stayed bridge. and summarize the experience of the management. In this paper, a series of test and analysis of the cable-stayed bridge stay-cable disease, and a series of test and analysis of the cable of the cable-stayed bridge of the cable-stayed bridge are proposed, and a series of test and analysis of the stay cable of the Lijiaojiang Bridge in Chongqing are carried out, and the research on the disease of the cable-stayed bridge in the bridge is studied. The suggestion is put forward to provide the guidance for the maintenance of the stay cable in the later stage of the bridge maintenance unit. and also provides an improved reference for the standardization management of the cable-stayed bridge and the design and construction of the cable-stayed bridge.
【學位授予單位】：重慶交通大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U446;U448.27

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本文編號：2328633