BFRP-CRCP配筋设计方法和参数敏感性分析  

Analysis on Reinforcement Design Method and Parameter Sensitivity of BFRP-CRCP

作　　者：冀志远 王骁帆 周舟 JI Zhi-yuan;WANG Xiao-fan;ZHOU Zhou(School of Architectural Science and Engineering,Yangzhou University,Yangzhou Jiangsu 225127,China;Zhejiang Institute of Communications Co.,Ltd.,Hangzhou Zhejiang 310030,China)

机构地区：[1]扬州大学建筑科学与工程学院,江苏扬州225127 [2]浙江省交通规划设计研究院,浙江杭州310030

出　　处：《公路交通科技》2022年第12期60-66,共7页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金项目(51678078,51178062);公路养护技术国家工程实验室开放基金资助项目(kfj150102)。

摘　　要：目前现有的玄武岩纤维增强塑料(BFRP)连续配筋混凝土路面(CRCP)配筋设计规范比较缺乏,相关研究也较少关注BFRP-CRCP结构响应的特点及参数敏感性。针对理论研究的不足,分析了CRCP的横向开裂机理,推导了CRCP配筋设计指标的解析公式。建立了CRCP的三维有限元模型,利用有限元计算验证了解析公式的合理性。将BFRP作为纵筋替代材料,对现有CRCP试验路的面层进行了结构优化。对温缩和干缩作用下的BFRP-CRCP进行了解析计算和比较分析,对横向裂缝间距和宽度设计极值给出了推荐范围。根据BFRP弹性模量、黏结刚度系数和线膨胀系数取值的不同,对BFRP-CRCP进行了参数敏感性分析。结果表明:通过分析纵筋和混凝土应力、位移的分布规律,表明板中间容易发生二次断裂,裂缝位置相对滑移最大;横向裂缝间距越大,纵筋应力极值、混凝土应力极值和横向裂缝宽度也越大;现行规范中关于配筋设计指标的范围取值偏保守,建议BFRP-CRCP横向裂缝间距的上限取2.2 m,横向裂缝宽度上限取1.2 mm;虽然BFRP会增大裂缝缝隙的宽度,但是能够大幅降低CRCP应力;提高BFRP的弹性模量和黏结强度,能够减小裂缝缝隙的宽度,但是会提高CRCP的应力极值。研究成果为BFRP-CRCP配筋设计指标提供了理论参考范围,有助于BFRP合理的材料性能参数选取,也对推广BFRP在水泥混凝土路面中的应用有一定的理论和实践意义。At present,there is a lack of current specification for the reinforcement design of CRCP with BFRP,and the related studies pay less attention to the characteristics of the structural response and parameter sensitivity for BFRP-CRCP.In view of the lack of theoretical research,the transverse cracking mechanism of CRCP is analyzed,and the analytical formula of CRCP reinforcement design indictor is derived.The 3D finite element model of CRCP is established,and the rationality of the analytical formula is verified by finite element calculation.Taking BFRP as the substitute material for longitudinal reinforcement,the structure of the surface course of the existing CRCP test road is optimized.The analytical calculation and comparative analysis of BFRP-CRCP under the action of temperature shrinkage and dry shrinkage are carried out,and the recommended range of design extremes of transverse crack spacing and width are given.The parameter sensitivity of BFRP-CRCP is analyzed based on the difference of elastic modulus,bond stiffness coefficient and linear expansion coefficient of BFRP.The result shows that(1)by analyzing the distribution rules of stress and displacement of longitudinal bars and concrete,it is shown that secondary cracking is easily occurred in the middle of the slab,and the relative slip at the crack location reaches the maximum;(2)the greater the transverse crack spacing,the greater the stress extremum of longitudinal bars,the stress extremum of concrete and the transverse crack width;(3)the range of reinforcement design indicator in the current specification is conservative,it is suggested that the upper limit of transverse crack spacing of BFRP-CRCP should be 2.2 m,and the upper limit of transverse crack width should be 1.2 mm;(4)although BFRP will increase the crack width,it can significantly reduce the CRCP stress;(5)increasing the elastic modulus and bond strength of BFRP can reduce the crack width,but it will increase the stress extreme value of CRCP.The research result provides a theoretical referen

关 键 词：道路工程 配筋设计指标 有限元 连续配筋混凝土路面 玄武岩纤维增强塑料 

分 类 号：U416.222[交通运输工程—道路与铁道工程]