本文選題：道路工程　切入點：非均布移動荷載　出處：《重慶交通大學學報(自然科學版)》2017年03期

【摘要】：基于實測非均布車輛荷載移動特性,采用Witczak黏彈性模型動態(tài)剪切模量,建立了非均布移動荷載作用下瀝青路面結(jié)構(gòu)瞬態(tài)動力分析的三維有限層模型,通過3D-MOVE Analysis軟件分析不同路面溫度、不同車輛行駛速度下瀝青路面動力響應(yīng)的時程變化和橫向分布規(guī)律,并與均布移動荷載的計算結(jié)果進行比較。結(jié)果表明:路面結(jié)構(gòu)層動力響應(yīng)具有交變特性;基層與土基應(yīng)變恢復具有滯后現(xiàn)象;面層頂面出現(xiàn)應(yīng)力應(yīng)變集中現(xiàn)象;在雙輪加載區(qū)域內(nèi)路面動力響應(yīng)橫向分布具有非對稱性,各動力響應(yīng)峰值出現(xiàn)在不同橫向位置上;與均布移動荷載比較,非均布移動荷載作用下的動力響應(yīng)沿橫向變化較小;隨著車輛行駛速度的增加,面層底部動力響應(yīng)先減小后增大,有一個峰值點,臨界速度約為48 km/h;當路面溫度由-10℃升高至50℃時,面層底部縱向、橫向應(yīng)變突變幅度分布分別增加了2.75,1.53倍,面層底部剪應(yīng)力顯著增加,且高溫下面層底部剪應(yīng)力容易出現(xiàn)應(yīng)力集中現(xiàn)象。
[Abstract]:Based on the dynamic shear modulus of Witczak viscoelastic model, a three-dimensional finite layer model for transient dynamic analysis of asphalt pavement structure under non-uniform moving load is established.The time-history variation and transverse distribution of the dynamic response of asphalt pavement under different road temperature and vehicle speed are analyzed by 3D-MOVE Analysis software, and the results are compared with the results of uniformly distributed moving load.The results show that the dynamic response of pavement structure has alternating characteristics, the strain recovery of base and soil is delayed, the stress and strain concentration appears on the top of surface layer, and the lateral distribution of dynamic response of pavement is asymmetric in the region of double wheel loading.The peak value of each dynamic response appears in different transverse position; compared with uniform moving load, the dynamic response under non-uniform moving load changes slightly along the transverse direction; with the increase of vehicle speed,The dynamic response at the bottom of the surface layer decreases first and then increases, with a peak point with a critical velocity of about 48 km / h. When the pavement temperature is increased from -10 鈩，

本文編號：1715331