【摘要】：針對BFRP筋連續(xù)配筋混凝土復(fù)合式路面這一新型的路面結(jié)構(gòu),采用ABAQUS有限元軟件,分別建立二維和三維模型,考慮汽車荷載、環(huán)境溫度及路面結(jié)構(gòu)層厚度與層間接觸條件等因素,計(jì)算BFRP筋連續(xù)配筋復(fù)合式路面混凝土板荷載應(yīng)力、路面溫度場及混凝土板溫度翹曲應(yīng)力,并進(jìn)行路面結(jié)構(gòu)參數(shù)敏感性分析。根據(jù)有限元計(jì)算結(jié)果并結(jié)合我國現(xiàn)行水泥混凝土路面設(shè)計(jì)規(guī)范疲勞公式,對BFRP筋連續(xù)配筋水泥混凝土層進(jìn)行了理論壽命探索。 首先,建立了基于線彈性理論、彈性半空間地基及裂縫模式下的BFRP筋連續(xù)配筋混凝土復(fù)合式路面荷載應(yīng)力三維有限元模型,并采用粘結(jié)單元定義裂縫接觸面的法向和切向接觸本構(gòu)行為,采用摩阻系數(shù)定義CRC層與基層的接觸關(guān)系。通過分析確定了不同裂縫間距下BFRP筋連續(xù)配筋復(fù)合式路面的臨界荷位,研究了不同路面結(jié)構(gòu)參數(shù)對混凝土板荷載應(yīng)力的影響,并與鋼筋配筋情況相比較。 其次,根據(jù)浙江某試驗(yàn)路所在地相關(guān)氣象資料,建立了基于熱力學(xué)理論及有限元方法的BFRP筋連續(xù)配筋復(fù)合式路面二維溫度場模型,分析得到不同時(shí)刻的路面溫度場及溫度梯度,并對比分析了不同AC層厚度對CRC層最大正溫度梯度的影響。 再次,建立了考慮AC層及相鄰混凝土板影響的彈性半空間地基上的BFRP筋連續(xù)配筋復(fù)合式路面溫度翹曲應(yīng)力有限元模型,根據(jù)溫度場有限元分析得到的最大正溫度梯度值,分析AC層厚度、AC層模量、CRC層厚度、CRC層模量、配筋率、板寬及裂縫剪切剛度等參數(shù)對混凝土板溫度翹曲應(yīng)力的影響。 最后,結(jié)合荷載應(yīng)力及溫度翹曲應(yīng)力有限計(jì)算結(jié)果,按照《公路水泥混凝土路面設(shè)計(jì)規(guī)范》(JTG D40-2011)中水泥混凝土疲勞公式對BFRP筋連續(xù)配筋水泥混凝土層進(jìn)行壽命分析,得到基于力學(xué)分析的CRC層理論使用壽命,并研究了AC層厚度、CRC層厚度、板寬、裂縫剪切剛度及土基模量等參數(shù)對CRC層理論使用壽命的影響。 本論文的研究工作得到國家交通運(yùn)輸部交通建設(shè)科技項(xiàng)目(2011318825780)資助。
[Abstract]:Aiming at the new type pavement structure of continuous reinforced concrete pavement with BFRP reinforcement, the 2D and 3D models are established by using ABAQUS finite element software. The factors such as vehicle load, ambient temperature, thickness of pavement structure layer and interlayer contact condition are taken into account. The load stress, pavement temperature field and temperature warping stress of BFRP reinforced composite pavement slab are calculated, and the sensitivity of pavement structure parameters is analyzed. Based on the results of finite element calculation and the fatigue formula of the current design code of cement concrete pavement in China, the theoretical life of continuous reinforced cement concrete layer with BFRP bars is explored. Firstly, a three-dimensional finite element model of BFRP reinforced concrete composite pavement is established based on linear elastic theory, elastic half-space foundation and crack mode. The normal and tangential contact constitutive behavior of crack contact surface is defined by bond element, and the contact relationship between CRC layer and base is defined by friction coefficient. The critical loading position of BFRP reinforced continuous reinforced composite pavement with different crack spacing is determined, and the influence of different pavement structure parameters on the load stress of concrete slabs is studied and compared with that of reinforced concrete slabs. Secondly, based on the relevant meteorological data of a certain experimental road in Zhejiang Province, a two-dimensional temperature field model of continuous reinforced composite pavement with BFRP reinforcement is established based on thermodynamics theory and finite element method, and the temperature field and temperature gradient of pavement at different times are obtained. The effect of different thickness of AC layer on the maximum positive temperature gradient of CRC layer is compared and analyzed. Thirdly, the finite element model of temperature warpage stress of BFRP reinforced composite pavement on elastic half-space foundation considering the influence of AC layer and adjacent concrete slab is established. According to the finite element analysis of temperature field, the maximum positive temperature gradient is obtained. The influence of the thickness of AC layer and the thickness of CRC layer on the temperature warping stress of concrete slabs is analyzed, such as the modulus of CRC layer, the ratio of reinforcement, the width of slab and the shear stiffness of crack. Finally, combined with the finite calculation results of load stress and temperature warping stress, according to the fatigue formula of cement concrete pavement of highway cement concrete pavement (JTG D40-2011), the life of continuous reinforced cement concrete layer with BFRP reinforcement is analyzed. The theoretical service life of CRC layer based on mechanical analysis is obtained, and the effects of the thickness of AC layer and the thickness of CRC layer, the width of plate, the shear stiffness of crack and the modulus of soil foundation on the theoretical service life of CRC layer are studied. The research work of this thesis is supported by the National Ministry of Transportation Science and Technology Project of Traffic Construction (20113 188 25780).
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U416.2

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本文編號(hào)：2177010