摘要
目的研究肋间距、筋直径、埋置长度、混凝土强度、混凝土保护层厚度和浇注深度等因素,对GFRP/钢绞线复合筋与混凝土黏结性能的影响.方法利用拉拔试验,对180个GFRP/钢绞线复合筋混凝土试件进行试验,测定每个试件的黏结强度和加载端滑移,根据试验结果研究不同因素对黏结性能的影响.结果肋间距为筋直径的1倍时,GFRP/钢绞线复合筋的黏结性能最佳;GFRP/钢绞线复合筋的黏结强度,随筋直径和埋置长度的增大而减小,随混凝土强度等级和保护层厚度的增加而增大;GFRP/钢绞线复合筋的"顶部筋"效应明显,黏结强度随浇注深度的增大而增大.结论肋间距、筋直径、埋置长度、混凝土强度、混凝土保护层厚度和浇注深度等均显著影响GFRP/钢绞线复合筋与混凝土的黏结性能;试验结果可为确定GFRP/钢绞线复合筋的锚固长度、构建GFRP/钢绞线复合筋的黏结-滑移模型以及制定相关规范提供理论依据.
Based on the pull-out test, 180 specimens were tested to study the influence of various parameters on bond behavior between GFRP/steel wire composite rebars and concrete. The test variables were the rebar rib spacing, rebar diameter, embedded length, concrete compressive strength, concrete cover thickness, and concrete cast depth. For each rebar, the average bond strength and the slip at the loaded end were analyzed and compared. The test results showed that the bond behavior was optimum when the rib spacing was the same as the rebar diameter. The bond behavior of GFRP/steel wire composite rebars also varied obviously with the rebar diameter, embedded length, concrete compressive strength, concrete cover thickness, and concrete cast depth. The test results can provide theoretical basis for determining the development length, building the model of bond-slip constitutive relationship of the GFRP/steel wire composite rebars, and establish- ing the related criterions.
出处
《沈阳建筑大学学报（自然科学版）》
EI
CAS
2008年第2期177-182,共6页
Journal of Shenyang Jianzhu University：Natural Science
基金
国家杰出青年科学基金(50525823)
交通部西部交通建设科技项目(200431882021)
