高温下的钢筋半灌浆套筒黏结性能研究

STUDY ON THE BONDING PROPERTIES OF SEMI-GROUT SLEEVE OF STEEL BAR UNDER INITIAL STRESS AT HIGH TEMPERATURES

为研究热力耦合作用下试件的破坏形态和承载能力以及不同条件变量下套筒连接试件中钢筋灌浆料粘结滑移曲线的变化规律,文中对48个钢筋半灌浆套筒连接试件进行常温和高温下不同初始应力条件下的轴向拉伸试验。基于试验结果,拟合得到了不同温度下钢筋与灌浆料粘结滑移关系方程,对钢筋半灌浆套筒中钢筋与灌浆料间的粘结滑移进行有限元模拟,验证试验得到的粘结滑移公式的合理性、准确性。

This paper studies the failure mode and bearing capacity of specimens under thermal coupling,as well as the variation law of the bond slip curve of steel grout in sleeve connected specimens under different condition vari⁃ables.Axial tensile tests on 48 steel semi grouted sleeve connected specimens under different initial stress condi⁃tions at room temperature and high temperatures are carried out,from which the bond slip relationship equations be⁃tween steel bars and grouting materials at different temperatures are fitted.Finite element simulation is conducted on the bond slip between steel bars and grouting materials in the semi grouting sleeve of steel bars to verify the ratio⁃nality and accuracy of the bond slip formula obtained from the experiments.