本文關(guān)鍵詞： 正交異性板 橋面 疲勞 鋪裝 荷載模型　出處：《中南大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：摘要：分析國(guó)內(nèi)外鋼橋規(guī)范對(duì)于疲勞設(shè)計(jì)的規(guī)定,應(yīng)用疲勞壽命評(píng)估方法和設(shè)計(jì)理論,選取城市橋梁中常用的不同鋪裝體系、瀝青鋪裝的不同剛度并研究正交異性鋼橋面板的構(gòu)造細(xì)節(jié)對(duì)其受力狀態(tài)及疲勞性能的影響,主要內(nèi)容有： (1)對(duì)低應(yīng)力幅問(wèn)題的處理,歐洲規(guī)范的規(guī)定相對(duì)合理,既考慮低應(yīng)力幅的損傷作用又不擴(kuò)大它的作用；關(guān)于疲勞荷載譜的研究,分析國(guó)外規(guī)范中符合其國(guó)情的疲勞荷載譜,為我國(guó)鋼橋規(guī)范尚未明確的疲勞荷載譜的制定提供參考。 (2)相比瀝青鋪裝,RPC(活性粉末混凝土)鋪裝體系能明顯改善鋼橋面板的受力狀態(tài),可大幅提高鋼橋面板的疲勞壽命；但焊縫的焊接質(zhì)量、殘余應(yīng)力等因素嚴(yán)重影響了鋼橋面板的疲勞特性,尤其在承受重車及超載車輛作用下,瀝青鋪裝體系的鋼橋面板的驗(yàn)算細(xì)節(jié)壽命不足20年。 (3)正交異性鋼橋面板驗(yàn)算細(xì)節(jié)的應(yīng)力幅隨鋪裝層剛度的增加而減小,提高鋪裝層的剛度可以明顯降低驗(yàn)算細(xì)節(jié)的應(yīng)力幅,尤其是對(duì)與鋪裝直接接觸的驗(yàn)算細(xì)節(jié)降低程度更加顯著。 (4)與公路車輛荷載相比,城-A車輛荷載作用下縱肋對(duì)接焊縫和縱肋與頂板連接焊縫處的等效應(yīng)力幅較大；而橫隔板腹板開(kāi)孔邊緣承受的應(yīng)力幅則相反,其值受車輛荷載的縱向軸距及相應(yīng)的軸重影響較大。 (5)分析閉口肋的不同形式及橫隔板過(guò)焊孔形狀等構(gòu)造細(xì)節(jié)對(duì)橋面板疲勞性能的影響,結(jié)果表明：U2形加勁肋的疲勞特性優(yōu)于U1形,U形肋疲勞特性明顯優(yōu)于V形。
[Abstract]:Absrtact: this paper analyzes the rules of fatigue design of steel bridge codes at home and abroad, and selects different paving systems commonly used in urban bridges by using fatigue life assessment method and design theory. The different stiffness of asphalt pavement and the influence of the construction details of orthotropic steel bridge panel on its stress state and fatigue performance are studied. The main contents are as follows: 1) to deal with the problem of low stress amplitude, the regulation of European Code is relatively reasonable, which not only considers the damage effect of low stress amplitude but also does not enlarge its function; On the research of fatigue load spectrum, the fatigue load spectrum according to its national conditions in foreign codes is analyzed, which provides a reference for the formulation of fatigue load spectrum which has not been defined in the code of steel bridges in China. Compared with the asphalt pavement RPC (reactive Powder concrete) pavement system can obviously improve the stress state of the steel bridge panel and greatly improve the fatigue life of the steel bridge slab; However, welding quality, residual stress and other factors seriously affect the fatigue characteristics of steel bridge panel, especially under the action of heavy and overloaded vehicles. The checking life of steel bridge panels of asphalt paving system is less than 20 years. 3) the stress amplitude of the check details of orthotropic steel bridge panel decreases with the increase of the pavement stiffness, and the stress amplitude of the checking details can be obviously reduced by increasing the stiffness of the pavement. In particular, the degree of reduction of the checking details of direct contact with the pavement is more significant. (4) compared with highway vehicle load, the equivalent stress amplitude of longitudinal rib butt weld and longitudinal rib-roof joint weld is larger under the action of City--A vehicle load. On the other hand, the stress amplitude at the opening edge of the transverse diaphragm web is opposite, and its value is greatly affected by the longitudinal wheelbase of vehicle load and the corresponding axle load. (5) the influence of different types of closed ribs and the shape of overwelded holes on fatigue performance of bridge deck is analyzed. The results show that the fatigue characteristics of the WU2 stiffener is better than that of U1. The fatigue characteristics of U-shaped rib are obviously better than that of V-shaped rib.
【學(xué)位授予單位】：中南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U443.33

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本文編號(hào)：1456237