【作者】 曹东伟；

【导师】 胡长顺；

【作者基本信息】 长安大学 ， 道路与铁道工程， 2001， 博士

【摘要】 连续配筋混凝土路面（CRCP）是在纵向连续配置足够数量的钢筋，施工时不设接缝的一种高性能混凝土路面结构。CRCP消除了普通混凝土路面的横向接缝，具有行车舒适性好，承载能力高，使用寿命长，养护维修少等显著优点。CRCP与目前公路交通运输日益大流量、重型化的发展趋势相适应，在重交通高等级道路中有广阔的应用前景。论文是国家自然科学基金项目《连续配筋混凝土路面设计理论与方法研究》（批准号：59778047）的重要组成部分。论文进行了CRCP荷载应力分析、温度应力分析、端部锚固结构分析和可靠性分析等工作，并结合室内模型试验与试验路研究，提出了设计方法。 荷载应力分析中，将CRCP中纵向钢筋作连续化处理，建立了正交各向异性薄膜单元，对考虑裂缝条件下的CRCP荷载应力进行了三维有限元分析。通过计算与分析，得到了不同裂缝间距时CRCP两种临界荷位，分别为轴载作用于板纵缝中部和轮载作用于板横缝中部一侧。通过参数敏感性分析，得出了配筋率、配筋位置和裂缝间距等参数对板底应力的影响规律。对CRCP与普通混凝土板在车辆荷载作用下的应力与位移响应的不同特点进行了分析，为CRCP板厚设计提供了依据。 温度应力分析中，根据钢筋与混凝土间的粘结滑移本构关系及地基摩阻力的线性分布假设，建立了CRCP温度应力的计算模型与应力平衡微分方程，并求得CRCP在降温、干缩和翘曲变形条件下混凝土和钢筋的应力及位移计算公式，得到了配筋率等计算参数与CRCP内部应力状态及裂缝宽度等外部使用性能之间的关系，分析了参数的敏感性。根据混凝土徐变度的表达式，考虑温度线性变化和正弦曲线变化两种情况，通过积分得出了以年为周期变化的温度松弛应力与干缩松弛应力计算公式，给出了相应的松弛影响修正系数。 根据地基摩阻力的不同模型，采用解析法和分段迭代法计算了由于升温产生的CRCP端部锚固力。分别采用有限元法和矩阵位移法计算分析了凸形锚固地梁的应力和位移，给出了端墙部分设计参数的建议值及位移、路面板设计弯矩和端墙设计弯矩计算诺谟图。使用有机玻璃进行室内模型试验，实测了端墙的位移、路面板应力、端墙应力及土压力，验证了理论分析结果，获得了端墙背后土压力的分布形式。 连续配筋混投土路面结构研究 CRCP的裂缝间距是随机变化的，裂缝间距的不同会对路面耐久性产生显著影响，本文使用直接积分法计算了CRCP裂缝间距的可靠度，并使用蒙特卡罗法进行了对比，分析参数的敏感性，指出影响可靠性最主要的因素是设计裂缝间距及参数的变异性，给出了CRCP可靠度计算诺漠图。 通过修筑CRCP试验路实体工程，研究并解决了CRCP施工中的关键技术问题一一钢筋的制作、定位与安装，给出了CRCP施工工艺流程、质量控制要求与温度控制措施等。通过试验路的弯沉与板内应力测试及横向裂缝变化的跟踪调查，实际考察了CRCP路用性能。 理论研究与试验路研究相结合，提出了CRCP设计指标，给出了设计标准和设计参数的建议取值，提出了板厚设计、考虑可靠性的配筋设计和端部锚固结构设计方法，可用于工程实践。更多还原

【Abstract】 Continuously Reinforced Concrete Pavement (CRCP) is one of high performance pavement structure with enough continuously steel bars in the longitudinal direction. With the exclusion of transverse expansion or contraction joints of Portland Concrete Pavement, CRCP has more advantages including better riding quality, higher bearing capacity, longer service life and less maintenance work. CRCP accords with the trend of highway transportation of containerization, heavy load and large traffic volume, and it has a vast application in high-grade highways in the future. This paper is an important part of the scientific project ~search of design theory and method for CRCP?(authorized number: 59778047) sponsored by national natural science funds. In the CRCP design principles, the author conducts- a comprehensive analysis of load stress, thermal stress, anchor end structure and pavement reliability. The construction techniques are studied on the base of building test roads, the following long-term observation and field tests.In the vehicle-load stress analysis, the orthogonal anisotropic membrane model is established by treating the longitudinal bars as continuum, and three dimensional finite element analyses is carried out with the consideration transverse crack. Through a great deal of calculation for different load position, two critical load positions are found out under the different length of transverse crack spacing - the central part in longitudinal joint and in the transverse crack of one side. Base on the sensitivity analysis of parameters, the relation of crack spacing, steel percentage and its location is studied. The different response of displacement and stress between CRCP and JCCP is compared and analyzed with the purposes of proper design for slab thickness.According to the bond-slip constitutive relation between the reinforced bar and concrete and the linear calculation model between the subgrade and concrete, the equilibrium differential equations are established for the analysis of the thermal stress in CRCP. The analytic solution is derived and the formula is provided to calculate the CRCP stress and displacement at critical position under the temperature drop and shrinkage. Through the numerical analysis, the relation between the internal stress and the external performance such as transverse crack spacing and width is discussed when the steel percentage is changed. Based on the creep expression of concrete, the formulas are presented to calculate the thermal and shrinkage relaxation stress on considerations of the linear or sine annual temperature variation by direct integration. The relaxation-modified coefficient is present to revise the elastic stress in CRCP.In terms of the different models of the friction force from the subgrade, the anchor force at CRCP ends is calculated using the analytical method and section interative method. The displacement and stress in trench lugs are analyzed by FEM and matrix displacement method. Though the sensitive analysis for parameters, thedesign values are recommended and a nomogram for displacement, design moment of lugs and pavement slab is provided. The indoor model test using organic glass is carried out and the displacement, stress, earth pressure as well as its distribution type are measured to verify the theoretical values.The crack spacing of CRCP changes randomly and has a significant impact on the pavement durability and performance. The direct integration method is used to analyze the reliability for crack spacing and width. The results show that the main factors that affected the reliability are the design crack spacing and the variability of parameters. This paper presents a nomogram for reliability calculation.Though building the CRCP test road, the key technique ?reinforcement installation is studied and solved successfully. The construction procedure, quality requirements and temperature control measures are presented. The field performance of CRCP is studied and evaluated through long-term observation, surveys and field更多还原