浆锚搭接拉拔试验与有限元分析

THE GROUT-ANCHORED OVERLAP PULL-OUT TEST AND FINITE ELEMENT ANALYSIS

浆锚搭接是装配式结构常用的连接方式,但大多应用于装配式结构中小直径钢筋的连接,对大直径钢筋的浆锚搭接拉拔性能研究较少。为获得大直径钢筋浆锚搭接的性能指标,文中设计拉拔试验研究25、28mm直径钢筋在不同搭接长度条件下的锚固性能,针对钢筋应力及基材裂缝发展进行研究,并利用实体有限元软件ANSYS进行模拟试验,分析拉拔过程中应力与裂缝的发展。结果表明仿真分析可有效预测5级荷载后应变与裂缝进展趋势,钢筋锚固长度在35D~45D范围内时试验过程中未出现拔出情况且基材混凝土未发生明显破坏,结构安全可靠。验证了大直径浆锚搭接结构的可行性。

Grout anchor lap joint is a commonly used connection method for prefabricated structures,but it is most⁃ly used for connecting small and medium-sized diameter steel bars in prefabricated structures.There is little re⁃search on the pull-out performance of grout anchor lap joint for large diameter steel bars.In order to obtain the per⁃formance indicators of large-diameter steel bar slurry anchor lap joint,pull-out tests are designed to study the an⁃choring performance of 25mm and 28mm diameter steel bars under different lap length conditions.The stress of the steel bars and the development of substrate cracks are studied,and simulation analysis is conducted using the solid finite element software ANSYS to analyze the development of stress and cracks during the pull-out process.The re⁃sults indicate that simulation analysis effectively predicts the trend of strain and crack development after fifth order loading.When the anchorage length of the steel bar is within the range of 35D~45D,there is no pull-out during the test process and there is no significant damage to the base material concrete.The structure is safe and reliable,which verified the feasibility of the large-diameter slurry anchor overlapping structure.