BFRP筋连续配筋复合式路面结构分析及使用寿命探索
发布时间：2018-08-11 12:36
【摘要】：针对BFRP筋连续配筋混凝土复合式路面这一新型的路面结构,采用ABAQUS有限元软件,分别建立二维和三维模型,考虑汽车荷载、环境温度及路面结构层厚度与层间接触条件等因素,计算BFRP筋连续配筋复合式路面混凝土板荷载应力、路面温度场及混凝土板温度翘曲应力,并进行路面结构参数敏感性分析。根据有限元计算结果并结合我国现行水泥混凝土路面设计规范疲劳公式,对BFRP筋连续配筋水泥混凝土层进行了理论寿命探索。 首先,建立了基于线弹性理论、弹性半空间地基及裂缝模式下的BFRP筋连续配筋混凝土复合式路面荷载应力三维有限元模型,并采用粘结单元定义裂缝接触面的法向和切向接触本构行为,采用摩阻系数定义CRC层与基层的接触关系。通过分析确定了不同裂缝间距下BFRP筋连续配筋复合式路面的临界荷位,研究了不同路面结构参数对混凝土板荷载应力的影响,并与钢筋配筋情况相比较。 其次,根据浙江某试验路所在地相关气象资料,建立了基于热力学理论及有限元方法的BFRP筋连续配筋复合式路面二维温度场模型,分析得到不同时刻的路面温度场及温度梯度,并对比分析了不同AC层厚度对CRC层最大正温度梯度的影响。 再次,建立了考虑AC层及相邻混凝土板影响的弹性半空间地基上的BFRP筋连续配筋复合式路面温度翘曲应力有限元模型,根据温度场有限元分析得到的最大正温度梯度值,分析AC层厚度、AC层模量、CRC层厚度、CRC层模量、配筋率、板宽及裂缝剪切刚度等参数对混凝土板温度翘曲应力的影响。 最后,结合荷载应力及温度翘曲应力有限计算结果,按照《公路水泥混凝土路面设计规范》(JTG D40-2011)中水泥混凝土疲劳公式对BFRP筋连续配筋水泥混凝土层进行寿命分析,得到基于力学分析的CRC层理论使用寿命,并研究了AC层厚度、CRC层厚度、板宽、裂缝剪切刚度及土基模量等参数对CRC层理论使用寿命的影响。 本论文的研究工作得到国家交通运输部交通建设科技项目(2011318825780)资助。
[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).
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U416.2
本文编号：2177010
[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).
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U416.2
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