FRP与砌体界面粘贴-滑移本构关系的适用性研究

对8个外贴FRP条加固砌体构件的粘结性能进行了试验,分析FRP应变以及局部粘结剪应力发展规律,计算得到了局部粘结应力-滑移关系曲线。通过对试验结果的统计回归分析,FRP与砌体的粘贴强度主要与砌体强度有关,并提出2种FRP与砌体界面的局部粘结剪应力-滑移本构关系数学模型。2种本构关系与试验的结果均吻合较好,可为砌体加固工程应用提供借鉴。

Bond-slip Constitutive Behavior Between Fiber-reinforced Polymer and Masonry

To study bond-slip constitutive behavior between fiber-reinforced polymer and masonry.In this paper,experiments of eight anchorage strength of FRP attached to masonrys are done,and FRP are dipped treatment before test.The hydraulic jack activated by a manual pump are used to load the specimen.The tensile strength is measured by using a loading transducer,and strain gauges are mounted directly onto the surface of the FRP composite to measure the strain during application of load.Besides the strain and bond stress development and distribution under every grade of loading are studied.Test results show that the maximum local bond stress is not influenced by the FRP bond length,instead it increases with masonry strength.At the same time,the local bond stress-slip curve is obtained.Based on the test results,two new bond stress-slip constitutive models between FRP and masonry are proposed and they turned out to be good matches to the experimental results,which indicate their valuable references for the corresponding codes and engineering applications.