【摘要】：當今橋梁向大跨徑發(fā)展的趨勢十分明顯,而波紋鋼腹板梁由于能顯著減輕橋梁上部結(jié)構的重量,完美解決PC箱梁混凝土腹板開裂的問題,增強了橋梁的跨越能力,因此在出現(xiàn)的幾十年間得到了快速的發(fā)展。由于橋梁不斷受到車輛荷載、風荷載等活荷載的作用,交通量不斷增大,屢禁不絕的貨車客車超載現(xiàn)象,以及不斷增大的橋梁跨徑等因素,都會增加波紋鋼腹板組合箱梁橋在運營期內(nèi)發(fā)生疲勞破壞的可能性。因此有必要對在車輛荷載作用下的波紋鋼腹板組合箱梁的疲勞性能進行研究。論文通過參考各國學者對波紋鋼腹板鋼梁、組合梁的相關理論分析及疲勞試驗結(jié)果,結(jié)合國內(nèi)外鋼橋及組合梁橋規(guī)范對結(jié)構抗疲勞驗算的相關規(guī)定,選取了合適的疲勞車、交通量及疲勞構造細節(jié)等級,運用有限元分析軟件對邢臺紫金波紋鋼腹板組合箱梁橋運營期內(nèi)的疲勞損傷及壽命進行了評估:橋梁120年的運營期內(nèi),在英國規(guī)范標準疲勞車、參考文獻中推薦的標準疲勞車、中國公路規(guī)范550kN重車分別作用下,各構造細節(jié)的累積疲勞損傷度D值都遠遠小于1,認為橋梁在運營期不會發(fā)生疲勞破壞,具有無限長疲勞壽命。論文通過參考波紋鋼腹板實橋的跨中橫截面形式及波紋形狀,采用有限元分析軟件建立了簡支波紋鋼腹板箱梁橋?qū)嶓w模型。通過改變腹板波紋的幾何參數(shù),例如腹板的傾斜角度、型號、高度等,研究幾何參數(shù)變化對其疲勞性能的影響,最后提出了改善其疲勞性能的方法。研究發(fā)現(xiàn)波紋鋼腹板傾斜角度及腹板厚度對其疲勞性能的影響最大,疲勞性能隨波紋鋼腹板傾斜角度的增大而降低,隨腹板厚度的增大而提高。腹板的高度對疲勞性能有一定的影響,采用不同的波紋鋼腹板型號對其疲勞性能的影響不顯著。
[Abstract]:Nowadays, the development trend of bridge to long span is very obvious, and the corrugated steel web beam can reduce the weight of bridge superstructure remarkably, solve the cracking problem of concrete web of PC box girder perfectly, and enhance the span ability of bridge. As a result, the emergence of decades of rapid development. Because the bridge is constantly subjected to live loads such as vehicle load, wind load and so on, the traffic volume is increasing constantly, the overloading phenomenon of truck and bus, and the increasing span of bridge, and so on. It will increase the possibility of fatigue failure of corrugated steel web composite box girder bridge during operation. Therefore, it is necessary to study the fatigue behavior of corrugated steel web composite box girder under vehicle load. By referring to the relevant theoretical analysis and fatigue test results of corrugated steel webs and composite beams by scholars from all over the world, combined with the relevant provisions of domestic and foreign steel bridges and composite beam bridge codes for structural fatigue checking, a suitable fatigue vehicle is selected. The fatigue damage and life of Xingtai Zijin corrugated steel web composite box girder bridge during operation are evaluated by using finite element analysis software. The fatigue damage and life of Xingtai Zijin corrugated steel composite box girder bridge during the operation period of 120 years is evaluated by using the finite element analysis software: during the 120 years operation period of the bridge, the fatigue vehicle is standardized in the United Kingdom. Under the action of China Highway Code 550kN heavy car, the cumulative fatigue damage degree D value of each structure detail is far less than 1. It is considered that the bridge will not occur fatigue damage during the operation period, and the fatigue damage degree D value of each structure detail is far less than 1, according to the standard fatigue vehicle recommended in the reference. It has infinite fatigue life. In this paper, the solid model of simply supported corrugated steel web box girder bridge is established by referring to the shape and shape of the middle cross section of corrugated steel web bridge and the finite element analysis software is used to establish the solid model of simply supported corrugated steel web box girder bridge. By changing the geometric parameters of web ripple, such as the inclination angle, type and height of the web, the influence of geometric parameters on the fatigue performance of the web is studied. Finally, the method to improve the fatigue performance of the web is put forward. It is found that the tilting angle and web thickness of corrugated steel web have the greatest influence on its fatigue properties. The fatigue performance decreases with the increase of web inclination angle and increases with the increase of web thickness. The height of the web has a certain effect on the fatigue performance, and the influence of different corrugated steel web type on the fatigue performance is not significant.
【學位授予單位】：長安大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U441.4

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本文編號：2464448