带竖向销键夯土墙抗震性能试验

为定量分析带竖向销键夯土墙的抗震性能，开展了6片带竖向销键夯土墙的水平低周反复荷载试验，分析了夯土墙的破坏过程和破坏形态，以植筋率、销键直径等为参数，研究了夯土墙滞回曲线、骨架曲线、承载力及变形性能、刚度退化规律和耗能能力等抗震性能。结果表明:夯筑分层处是夯土墙受力薄弱环节，竖向销键对夯土墙的抗侧承载力影响较小，对延性有比较显著的改善；随着植筋率的增加，延性系数先增大，后减小；随着竖向销键直径的增大，延性系数逐渐减小；竖向销键对夯土墙初始刚度有一定程度的削弱，对刚度退化趋势影响不明显；竖向销键可明显提升夯土墙耗能能力；各试件等效黏滞阻尼系数随加载进程波动较明显；极限位移状态下，各试件的等效黏滞阻尼系数在0.13～0.24范围；所得研究结果可为深入了解带竖向销键夯土墙的抗震性能及其实际应用提供理论依据。

Experiment on Seismic Performance of Rammed Earth Wall with Vertical Pin

In order to analyze the seismic performance of rammed earth walls with vertical pin quantitatively, the low cyclic loading tests on six rammed earth walls with vertical pin were carried out, and the failure process and failure forms of rammed earth walls were analyzed. Taking the rebar planting rate and the diameter of vertical pins as parameters, the seismic performances, such as hysteresis curves, skeleton curves, bearing capacity and deformation, stiffness degradation law, energy dissipation capacity, were studied. The results show that the rammed stratification is the weak link of rammed earth walls. The vertical pin has little influence on the lateral bearing capacity of rammed earth walls, and has a significant improvement on ductility. With the increase of the rebar planting rate, the ductility coefficient increases firstly and then decreases. With the vertical pin diameter increasing, the ductility coefficient decreases gradually. The vertical pin weakens the initial stiffness of the rammed earth wall and has no obvious influence on the trend of the stiffness degradation, and the vertical pin can significantly enhance the energy dissipation capacity of rammed earth wall. The fluctuation of the equivalent viscous damping coefficient with the loading process is obvious; under the condition of the limit displacement, the equivalent viscous damping coefficient is in the range of 0.13-0.24. The Study results can provide a theoretical basis for indepth understanding the seismic performance of rammed earth wall with vertical pin and its practical application.