早期竖向压应力对水平钢筋与砖砌体界面粘结性能的影响  

Influence of Early Vertical Compressive Stress on Bond Performance of Interface between Horizontal Reinforcing Bars and Brick Masonry

作　　者：王作伟 赵建昌[1] WANG Zuo-wei;ZHAO Jian-chang(School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China)

机构地区：[1]兰州交通大学土木工程学院,兰州730070

出　　处：《兰州交通大学学报》2022年第1期12-19,共8页Journal of Lanzhou Jiaotong University

摘　　要：基于配筋砌体在施工过程中水平钢筋实际的受力状态,设计试验装置使配筋砖砌体试件在砂浆凝结硬化前承受早期竖向压应力,通过拉拔试验的方法得到水平钢筋与砖砌体界面的破坏形式和粘结滑移曲线,并建立τ-s曲线粘结参数,对比分析预加早期压应力的配筋砖砌体试件与常规试验的后持荷试件在不同竖向压应力状态下粘结参数指标的变化差异.试验结果表明:竖向压应力均提高了两类试件水平钢筋与砖砌体界面的粘结强度,但承受早期竖向压应力的预持荷试件水平钢筋的极限粘结强度与滑移耗能明显高于常规试验的后持荷试件.Based on the actual stress state of horizontal reinforcing bars in the construction process of reinforced masonry,a testing setup which applied the early vertical compressive stress on the specimens of reinforced brick masonry before setting and hardening of mortar was designed.The failure modes and bond-slip curves of the interface between horizontal reinforcing bars and brick masonry were obtained by using pull-out test and the bonding parameters of the τ-s curves were established.The difference of the bonding parameters between the reinforced brick masonry specimens with early compressive stress and the specimens in conventional tests was analyzed under different vertical compressive stress.The test results show that the vertical compressive stress can improve the ultimate bond stress of the interface between horizontal reinforcing bars and brick masonry,but the ultimate bond stress and the energy dissipation of the horizontal reinforcing bars in the specimens with early compressive stress were significantly higher than that in the specimens in conventional tests.

关 键 词：配筋砌体 早期竖向压应力 拉拔试验 粘结强度 

分 类 号：TU362[建筑科学—结构工程]