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Bond Behaviors between Ribbed BFRP Bars and Ecological High Ductility Cementitious Composites
KSCE Journal of Civil Engineering ( IF 2.2 ) Pub Date : 2020-09-04 , DOI: 10.1007/s12205-020-2124-5
Lijuan Chai , Liping Guo , Bo Chen , Jiandong Wu

Direct pull-out method was conducted to explore the bond stress-slip response of ribbed basalt fiber reinforced polymer (BFRP) bars embedded in ecological high ductility cementitious composites (Eco-HDCCs). The effects of the embedment length and cover thickness on the bond properties between Eco-HDCCs and the bars were described. Results indicate that the failure characteristics of the specimens depend on the embedment length and cover thickness of the BFRP bars. As the embedment lengths of the bars increase, the ultimate bond stress decreases while the ultimate slip increases. Besides, both the ultimate bond stress and ultimate slip show an increasing trend if the specimen has a cover thickness of less than 45 mm, while the increasing trend is slower if the specimen has a cover thickness of more than 45 mm. In addition, the strain of the specimen surface depends on the cover thickness, and the strain increases when the cover thickness is in a range of15 mm–35 mm. Moreover, certain embedment lengths and cover thicknesses of the BFRP bars are recommended in the structural design of bridge deck link slabs. The bond stress-slip relationship models of the BFRP bars in Eco-HDCCs are proposed based on the test results.



中文翻译:

带肋的BFRP筋与生态高延展性水泥基复合材料之间的粘结行为

采用直接拉出法研究了生态高延性胶凝复合材料(Eco-HDCCs)中嵌入的带肋玄武岩纤维增强聚合物(BFRP)钢筋的粘结应力-滑动响应。描述了嵌入长度和覆盖层厚度对Eco-HDCC与钢筋之间粘结性能的影响。结果表明,试样的破坏特性取决于BFRP筋的包埋长度和覆盖厚度。随着杆的嵌入长度增加,极限粘结应力减小,而极限滑移增大。此外,如果覆盖层厚度小于45 mm,则极限粘结应力和极限滑移都显示出增加的趋势,而如果覆盖层厚度大于45 mm,则增长趋势较慢。此外,样品表面的应变取决于覆盖层的厚度,当覆盖层的厚度在15 mm–35 mm范围内时,应变会增加。此外,在桥面连接板的结构设计中,建议使用一定的埋入长度和BFRP钢筋的覆盖厚度。根据试验结果,提出了Eco-HDCC中BFRP筋的粘结应力-滑移关系模型。

更新日期:2020-09-02
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