震后可恢复功能摇摆柱抗震性能试验研究

Experimental study on seismic performance of earthquake resilient rocking column

为实现地震后结构性能快速恢复,针对设置开缝钢板阻尼器的震后可恢复功能摇摆(ERR)柱技术,采用增加螺栓数量以减小连接板与钢板阻尼器端部局部滑移的方法对该技术予以改进。为进一步研究改进后ERR柱的受力特性及性能可恢复性,完成了8个足尺试件的低周往复加载试验,主要研究轴压比、钢板阻尼板厚度和阻尼器数量等对试件抗震性能的影响规律。结果表明:采用"强柱弱阻尼器"原则设计的ERR柱在水平荷载作用下,塑性变形均集中于可更换开缝钢板阻尼器上;ERR柱具有稳定的滞回耗能性能,水平承载力随轴压力和阻尼器厚度的增加而增加;在垂直加载方向增设2个阻尼器后,ERR柱的承载力平均提高了约11%,极限变形能力平均提高了约14%。

In order to achieve structural resilience after earthquakes, based on the earthquake resilient rocking(ERR) column technology with steel slit dampers, the ERR column was improved by increasing the number of bolts to reduce the local slippage between the end of steel slit damper and the connecting plate. To further study the mechanical properties and the performance resilience of the improved ERR column, the quasi-static tests on eight full-scaled ERR columns were carried out. The influences of axial compression ratio, plate thickness, and the number of steel slit dampers on the seismic performance of ERR columns were studied. It is indicated that, with the ‘strong-column/weak-damper’ design philosophy, the plastic deformation of ERR columns under major earthquake would be concentrated on the replaceable steel slit dampers. Stable hysteretic performance of ERR columns was achieved. The horizontal load carrying capacity of ERR columns increases with the increase of the axial compression ratio and damper thickness. By adding two steel slit dampers at the bottom of the column perpendicular to the loading direction, the lateral load carrying capacity and ultimate deformation of ERR columns are increased by 11% and 14%, respectively.