【摘要】 GFRP/钢绞线复合筋与混凝土的粘结是二者能够协同工作的基础,而且GFRP/钢绞线复合筋与混凝土的粘结-滑移本构关系模型是其粘结性能的综合反映,因此,研究GFRP/钢绞线复合筋与混凝土的粘结-滑移本构关系模型,对GFRP/钢绞线复合筋增强混凝土结构的性能分析、设计理论及工程应用等具有重要的理论意义和实用价值。对180个试件进行拉拔试验,系统地研究肋间距、筋直径、埋置长度、混凝土强度、混凝土保护层厚度和混凝土浇注深度等因素对粘结性能的影响,测定试件的粘结-滑移曲线。通过对GFRP/钢绞线复合筋粘结破坏特征、粘结-滑移机理及受力全过程的分析,在已有粘结-滑移本构模型的基础上,提出一种新的粘结-滑移本构关系模型,并与试验结果和已有模型进行比较。新构建的粘结-滑移本构关系模型概念清晰、形式简单,能较好地反映GFRP/钢绞线复合筋的受力全过程,与试验结果吻合良好,并优于已有粘结-滑移模型。更多还原

【Abstract】 The bond behavior is the basis of collaboration between GFRP/steel wire composite rebar and concrete,and the bond-slip constitutive model is the overall reflection of bond behavior of GFRP/steel wire composite rebar embedded in concrete.Thus,the research on the constitutive model of bond-slip relationship between GFRP/steel wire composite rebar and concrete has theoretical and practical value in the performance analysis,design theory and engineering application of concrete structures reinforced with GFRP/steel wire composite rebars.In this study,180 pull-out specimens were tested to investigate the effect of rebar rib spacing,rebar diameter,embedded length,concrete compressive strength,concrete cover thickness,and concrete cast depth on bond behavior,and the bond-slip curves were obtained for each specimen.Based on the existing bond-slip constitutive models worldwidely,one new bond-slip constitutive model was proposed according to the analysis of bond failure,bond-slip mechanism,and loading process of GFRP/steel wire composite rebar.The newly built bond-slip constitutive model was compared with the test results and existing bond-slip models.It is explicit in physical concept and simple in form,and fits the whole loading process of GFRP ribbed rebar and the test results well.更多还原