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Experimental and theoretical investigation on bond performance between surface-modified bamboo scrimber bars and concrete
Journal of Building Engineering ( IF 6.7 ) Pub Date : 2024-11-07 , DOI: 10.1016/j.jobe.2024.111261 Chengjun Wu, Yang Wei, Jiawei Chen, Gaofei Wang, Yu Lin
Journal of Building Engineering ( IF 6.7 ) Pub Date : 2024-11-07 , DOI: 10.1016/j.jobe.2024.111261 Chengjun Wu, Yang Wei, Jiawei Chen, Gaofei Wang, Yu Lin
With the aim of facilitating the adoption of eco-friendly bamboo scrimber bars as an alternative to the widely used steel bars in concrete structures, center pull-out tests were conducted on 75 specimens to investigate the bond performance between bamboo scrimber bars and concrete. Two innovative modification methods were employed, including the sand coating modification method with varying particle sizes and a newly proposed method involving wrapping with basalt fiber bundles, with a focus on the impact of bundles spacing on bond strength. Additionally, other influence factors, including the concrete compressive strength, development length, and equivalent diameter of bamboo scrimber bars, were investigated. The test results show that compared to unmodified bamboo scrimber bars, those modified with sand and basalt fiber bundles show increases in bond strength of 5.50–5.96 times and 4.82–6.15 times, respectively. The bond strength was most significantly influenced by the development length, which decreases with increasing development length. Besides, specimens with development length less than 75 mm mainly exhibit pull-out failure, while those with development length equal to 75 mm primarily occur concrete splitting failure. Furthermore, a bond strength prediction formula and a bond stress-slip constitutive model for the interface between bamboo scrimber bars modified with sand coating and concrete were established, which show great agreement with the test results.
中文翻译:
表面改性竹丝网筋与混凝土粘结性能的实验和理论研究
为了促进采用环保的竹制钢筋作为混凝土结构中广泛使用的钢筋的替代品,对 75 个试样进行了中心拉拔试验,以研究竹制钢筋与混凝土之间的粘合性能。采用了两种创新的改性方法,包括不同粒径的砂涂层改性方法和一种新提出的涉及用玄武岩纤维束包裹的方法,重点是束间距对粘合强度的影响。此外,还研究了其他影响因素,包括混凝土抗压强度、展开长度和竹制皂条的等效直径。试验结果表明,与未改性的竹丝筋相比,用沙子和玄武岩纤维束改性的竹丝筋的粘结强度分别提高了 5.50-5.96 倍和 4.82-6.15 倍。键强度受显影长度的影响最显著,显影长度随显影长度的增加而降低。此外,展开长度小于 75 mm 的试件主要表现为拉拔破坏,而展开长度等于 75 mm 的试件主要表现为混凝土劈裂破坏。此外,建立了砂涂层改性竹制筋与混凝土界面的粘结强度预测公式和粘结应力-滑移本构模型,与试验结果吻合较好。
更新日期:2024-11-07
中文翻译:
表面改性竹丝网筋与混凝土粘结性能的实验和理论研究
为了促进采用环保的竹制钢筋作为混凝土结构中广泛使用的钢筋的替代品,对 75 个试样进行了中心拉拔试验,以研究竹制钢筋与混凝土之间的粘合性能。采用了两种创新的改性方法,包括不同粒径的砂涂层改性方法和一种新提出的涉及用玄武岩纤维束包裹的方法,重点是束间距对粘合强度的影响。此外,还研究了其他影响因素,包括混凝土抗压强度、展开长度和竹制皂条的等效直径。试验结果表明,与未改性的竹丝筋相比,用沙子和玄武岩纤维束改性的竹丝筋的粘结强度分别提高了 5.50-5.96 倍和 4.82-6.15 倍。键强度受显影长度的影响最显著,显影长度随显影长度的增加而降低。此外,展开长度小于 75 mm 的试件主要表现为拉拔破坏,而展开长度等于 75 mm 的试件主要表现为混凝土劈裂破坏。此外,建立了砂涂层改性竹制筋与混凝土界面的粘结强度预测公式和粘结应力-滑移本构模型,与试验结果吻合较好。