高强钢绞线网增强ECC与混凝土界面黏结-滑移关系研究EI北大核心CSCD

良好的界面黏结是保证高强钢绞线网增强工程用水泥基复合材料(HSSWM-ECC)与混凝土协同工作的前提,其界面黏结的有效程度决定着HSSWM-ECC材料性能的发挥。为研究HSSWM-ECC与混凝土界面黏结性能,以混凝土抗压强度、界面黏结长度、黏结宽度和界面处理方式为参数,对设计制作的9组27个梁铰式试件进行了界面黏结性能试验。试验结果表明:界面黏结-滑移受力过程呈现明显的两阶段特征:非线性上升段和下降段。基于试验结果,探究了HSSWM-ECC与混凝土间界面黏结破坏特征和受力机理,构建了考虑各参数影响的界面黏结-滑移关系模型;采用微段分析法对模型特征参数进行了分析,结果表明:所建模型及特征参数计算与试验结果吻合良好,可较好表征HSSWM-ECC与混凝土界面黏结-滑移关系力学行为。

STUDY ON INTERFACIAL BOND-SLIP RELATIONSHIP BETWEEN HSSWM-ECC AND CONCRETE

Eminent interfacial bond behavior is a prerequisite to ensure the cooperative work between high-strength steel wire mesh reinforced engineered cementitious composite (HSSWM-ECC) and concrete, and the effectiveness of the interfacial bonding determines the utilization of the performance of HSWM-ECC. In order to study the interfacial bond performance between HSSWM-ECC and concrete, nine groups of modified beam specimens (totally 27 specimens) were designed and tested by considering the influences of the factors such as concrete compressive strength, interfacial bond length, interfacial bond width and, interfacial treatment methods. According to the test results, the bond failure characteristics and stress mechanism of the interface between HSSWM-ECC and ECC were explored, and the interfacial bond-slip relationship model was developed by considering the influences of design parameters. A micro-segment analysis method was used to analyze the characteristic parameters of the model. The study results showed that the proposed model and model parameter calculation formulas agree well with test results and can well characterize the mechanical behavior of the interfacial bond-slip relationship between HSSWM-ECC and concrete.