端部加强型钢管阻尼器性能试验研究

Experimental study on mechanical properties of end-strengthened steel pipe damper

传统钢管阻尼器因端部容易发生过早破坏,导致阻尼器耗能性能得不到充分发挥。本文对传统钢管阻尼器进行改进,提出一种新型端部加强型钢管阻尼器,介绍其构造形式及工作机理。设计钢管阻尼器和端部加强型钢管阻尼器各一个,对其进行低周往复加载试验,研究端部加强构造的合理性及端部加强型钢管阻尼器的力学性能。研究结果表明:1)设置加强钢管能够有效延缓钢管端部开裂,避免阻尼器因过早开裂而失去承载能力,充分发挥阻尼器耗能能力;2)端部加强型钢管阻尼器耗能性能好,其滞回曲线对称且饱满,等效阻尼比稳定在0.40左右,且能在小位移下进入屈服耗能状态;3)端部加强型钢管阻尼器较钢管阻尼器力学性能更优,屈服荷载和极限荷载相较钢管阻尼器分别提升18.78%和24.42%,二者初始刚度相近,屈服后刚度降低15.27%。

The traditional hollow steel pipe damper(HSPD)is prone to have untimely failure of the end of damper,makes the energy dissipation performance not fully developed.In this paper,a new type of end-strengthened steel pipe damper(ESPD)is proposed,and its configuration type and working mechanism are introduced.To verify the reasonableness of the end-strengthened structure and investigate the mechanical properties of ESPD,one hollow steel pipe damper(HSPD)specimen and one ESPD specimen are designed for low-frequency cyclic loading.The results show that the strengthened steel pipe can effectively delay the cracking moment of the end of the steel pipe and avoid the premature loss of the bearing capacity due to the end crack,and the damper can better dissipate energy.And the hysteresis curve of the ESPD is symmetrical and plump,it has strong energy dissipation capacity,the equivalent damping ratio is stable at about O.40,and can reach the yielding energy dissipation state under small displacement.Compared with HSPD,ESPD has better mechanical properties,the initial stiffness are similar,and the yield load and ultimate load are increased by 18.78%and 24.42%respectively and the post-yielding stiffness is reduced by 15.27%.