BFRP筋连续配筋混凝土路面的配筋设计

发布时间：2018-02-02 08:52

本文关键词： 道路工程配筋设计解析法 BFRP筋连续配筋混凝土路面均匀温降混凝土干缩　出处：《华南理工大学学报(自然科学版)》2017年04期 　论文类型：期刊论文

【摘要】：建立BFRP筋连续配筋混凝土路面的均匀温降模型,考虑混凝土材料的干燥收缩以及基层约束作用,推导出裂缝控制指标(裂缝间距、裂缝宽度和筋材应力)的解析解公式,采用有限元方法验证解析解公式的有效性.利用解析法分析BFRP筋的配筋方案及其材料特性对裂缝控制指标的影响,推荐BFRP筋连续配筋混凝土路面的配筋设计指标.研究结果表明:随着配筋率的增大,裂缝间距、裂缝宽度以及筋材应力逐渐减小,相同的配筋率下采用小直径、小间距的配筋方案对控制裂缝更为有利;增大BFRP筋弹性模量、BFRP筋与混凝土的粘结刚度系数可减小裂缝间距和裂缝宽度,但对筋材应力影响轻微;应采取有效的工程措施来提高BFRP筋的弹性模量及BFRP筋与混凝土的粘结刚度系数.在BFRP筋连续配筋水泥混凝土路面的配筋设计中,建议裂缝平均间距限值为2.0 m,裂缝宽度限值为1.0 mm,CRC层配筋率不小于0.6%.
[Abstract]:The uniform temperature drop model of continuous reinforced concrete pavement with BFRP bars is established. The crack control index (crack spacing) is deduced considering the drying shrinkage of concrete material and the constraint of base course. The finite element method is used to verify the validity of the analytical solution formula. The influence of the reinforcement scheme and the material characteristics of the BFRP bars on the crack control index is analyzed by using the analytical method. The design index of continuous reinforced concrete pavement with BFRP reinforcement is recommended. The results show that with the increase of reinforcement ratio, crack spacing, crack width and reinforcement stress decrease gradually. Under the same reinforcement ratio, it is more advantageous to control cracks by using small diameter and small spacing reinforcement scheme. Increasing the elastic modulus of BFRP tendons and the bond stiffness coefficient between BFRP bars and concrete can reduce the crack spacing and crack width, but have a slight effect on the stress of the steel bars. Effective engineering measures should be taken to improve the elastic modulus of BFRP tendons and the coefficient of bond stiffness between BFRP tendons and concrete. It is suggested that the average crack spacing is 2.0 m and the crack width limit is 1.0 mm ~ (-1) mm CRC layer reinforcement ratio is not less than 0.6 m.
【作者单位】：华南理工大学土木与交通学院;广东省公路管理局;
【基金】：国家自然科学基金资助项目(51278201) 广东省交通运输厅科技项目(科技-2013-02-015) 广东省公路管理局科研课题(2013-5)~~
【分类号】：U416.216
【正文快照】： 玄武岩纤维筋(BFRP筋)抗拉强度高,耐腐蚀,节能环保[1],确定适宜的横向裂缝间距与宽度、控制混凝土板纵筋配筋率能减少连续配筋混凝土路面混凝土板冲断破坏的发生.Zollinger等[2]采用非线性有限元半离散法分析混凝土的干缩应变以及初期开裂后计入混凝土蠕变影响的应力分布.Kim

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