EXPERIMENTAL STUDY ON BOND-SLIP BEHAVIOR BETWEEN ENCASED STEEL AND HIGH-PERFORMANCE-FIBER CONCRETE

Ten push-out experimental specimens were cast and tested to study the interfacial bond-slip behavior of section steel and high-performance fiber concrete (HPFC). The main parameters investigated were strength grade, concrete cover thickness and embedded length. The failure process and load-slip (P-S) curves were obtained. The influence regularities of design parameters on the characteristic bond strength were studied, and the formulae of characteristic bond strength were established. The effective bond stress was introduced and deduced. Through the analysis of the whole process of the effective bond stress slip curve, the development of bond stress was obtained. The results show that : the characteristics bond strength were increased by the increase of the concrete cover thickness and the concrete strength; the calculated value of the characteristics bond strength appeared were similar to that of the test values; the effective bond stress reflected the development and transformation of bond stress at the interface between section steel and high-performance-fiber-concrete; the proportional relationship among the components of the bonding force was derived by process analysis. The research provides an experimental support for analyzing the mechanical behaviors of steel reinforced high-performance-fiber-concrete.