锚杆静压桩混凝土加固既有建筑物的应用研究

Research on the application of anchor rod static pressure pile concrete reinforcement for existing buildings

为了提升锚杆静压桩混凝土加固既有建筑的抗震性能,对比分析了叠合梁结构(HA-1、HA-2和HA-3)和框架梁+柱体结构(HA-4)试件的破坏形态、滞回曲线、骨架曲线、刚度退化和耗能能力。结果表明:4种试件在加载过程中都会经历开裂、屈服、峰值和极限应力阶段,各个试件的表面破坏形态也有所不同。4组试样的滞回曲线都较为饱满,整体呈现反S形态,但是不同试件的滞回曲线的捏缩程度不同。相较于其他3组试件,HA-4试件在到达峰值荷载前的累积耗能速率要明显高于其他试样,且整体而言,叠合梁结构试件的耗能能力会低于框架梁+柱体结构试件(HA-4)。

In order to improve the seismic performance of existing buildings reinforced with anchor rod static pressure pile concrete,a comparative analysis was conducted on the failure modes,hysteresis curves,skeleton curves,stiffness degradation,and energy dissipation capacity of composite beam structures(HA-1,HA-2,HA-3)and frame beam+column structures(HA-4)specimens.The results indicate that all four types of specimens undergo cracking,yielding,peak and ultimate stress stages during the loading process,and the surface failure morphology of each specimen is also different.The hysteresis curves of the four groups of samples are relatively full,showing an overall anti S shape,but the degree of pinching of the hysteresis curves varies among different specimens.Compared to the other three groups of specimens,the cumulative energy dissipation rate of the HA-4 specimen before reaching the peak load is significantly higher than that of the other specimens,and overall,the energy dissipation capacity of the composite beam structure specimen is lower than that of the frame beam+column structure specimen(HA-4).