为了克服传统弯曲型、剪切型金属阻尼器无法在肘节式等位移放大装置安装使用的现状,提出一种基于X形钢板屈服耗能的装配式活塞阻尼器(X-shaped piston metal damper,XPMD),其由一组平行的金属环片(X形钢板为主要耗能元件)、内部传动杆及外部套筒共同组成.具有耗能功效的金属环片通过高强螺栓与内部传动杆及外部套筒相互连接,具有较好的装配性及易于更换的特点.通过试验系统研究了 X形钢板端头宽度、缩颈宽度、纵向长度及厚度等参数对XPMD阻尼器滞回性能的影响规律,同时提出了 XPMD阻尼器的理论力学评估模型.以多层框架为例,对比分析了在地震作用下安装XPMD阻尼器前后其位移响应、层间剪力的变化特点,验证了 XPMD阻尼器对框架结构的减震效果.研究结果表明:在循环荷载作用下XPMD阻尼器具有稳定的滞回性能,在较小变形下地震输入能量主要通过X形钢板弯曲变形实现能量耗散,在较大变形条件下X形钢板拉伸变形逐渐增大使得XPMD阻尼器等效刚度有所增加;安装XPMD阻尼器可明显降低框架结构在地震作用下的位移及层间剪力响应.
Experimental study on mechanical properties of assembled X-shaped steel plate piston damper and its application
To overcome the difficulty in traditional bending and shearing metal dampers being used in elbow-type displacement amplification devices,X-shaped piston metal damper(XPMD)was proposed by utilizing yielding of X-shaped steel plate to dissipate energy.The damper was comprised of a set of parallel metal rings(X-shaped steel plate is the main energy dissipation element),internal transmission rod,and external sleeve.The energy dissipation element was easy to install and replace in the case of failure.The effects of variations in end width,necking width,longitudinal length and thickness of the X-shaped steel plate on the hysteretic performance of XPMD was investigated in detail.Meanwhile,a theoretical mechanical evaluation model for XPMD dampers was proposed.Taking a multi-story frame as an example,the variation characteristics of the inter-story displacement and inter-story shear force before and after the installation of XPMD under seismic excitation were analyzed,and the damping effect of XPMD on the frame structure was verified.This study indicates that the proposed damper has stable hysteretic behavior under cyclic loads,the seismic input energy is dissipated through flexural yielding of X-shaped steel plate at small deformations.At large deformation,tensile behavior is generated,which will cause increase in stiffness of the damper system.The installation of XPMD can significantly reduce the inter-story displacement and inter-story shear force response of frame structure under earthquake excitation.
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