發(fā)布時(shí)間：2018-05-17 13:53

  本文選題：道路工程 + 懸空路面��； 參考：《中國(guó)公路學(xué)報(bào)》2016年03期

【摘要】：為了研究懸空路面板斷裂機(jī)制,按照Winkler彈性地基假設(shè),借鑒Westergaard求解非懸空無限大板應(yīng)力解的思路,將平行懸空路面等效為非懸空路面板,按照特殊的邊界條件進(jìn)行處理,得到了平行懸空路面板應(yīng)力場(chǎng)解析表達(dá)式。結(jié)合斷裂力學(xué)的觀點(diǎn),選取三維斷裂模型設(shè)置表生裂紋,分析受路面板懸空部分自重和車輛荷載作用下的極限承載力。通過工程實(shí)例,得出了懸空比例R與極限承載力之間的關(guān)系,同時(shí)對(duì)該等效方法的適用范圍進(jìn)行了討論。結(jié)果表明:當(dāng)懸空比例R=0.4時(shí),極限承載力為50.3kN,在標(biāo)準(zhǔn)軸載作用下,50kN的車輛荷載就可能使得懸空路面板發(fā)生突然的脆性斷裂破壞,導(dǎo)致安全事故發(fā)生;當(dāng)0R0.5時(shí),懸空路面板發(fā)生局部斷裂破壞,可以按照所提出的等效方法求解極限承載力;當(dāng)R≥0.5時(shí),懸空路面板未達(dá)到極限承載力即發(fā)生整體性傾覆破壞,該求解方法將不再適用。
[Abstract]:In order to study the fracture mechanism of suspended pavement slab, according to the assumption of Winkler elastic foundation and using Westergaard to solve the stress solution of infinite plate, parallel suspended pavement is equivalent to non-suspended slab, and is treated according to special boundary conditions. The analytical expression of the stress field of the slab of the parallel suspension path is obtained. Based on the viewpoint of fracture mechanics, a three-dimensional fracture model was selected to set up the surface crack, and the ultimate bearing capacity of the suspended part of the road slab and the vehicle load was analyzed. The relationship between suspended ratio R and ultimate bearing capacity is obtained by engineering example, and the applicable range of the equivalent method is discussed. The results show that the ultimate bearing capacity is 50.3 KN when the suspended ratio is 0. 4, and the vehicle load of 50 KN under the action of standard axle load may lead to the sudden brittle fracture failure of the suspended road slab and the occurrence of safety accident. The local fracture failure of suspended road slab can be used to calculate the ultimate bearing capacity according to the proposed equivalent method, and when R 鈮，

本文編號(hào)：1901633