预压碟簧自复位黏滞阻尼器受力性能试验研究

Experimental study on mechanical performance of self-centering viscous dampers with pre-pressed disc springs

针对自复位支撑耗能能力不足的问题,提出了适用于自复位支撑框架结构的预压碟簧自复位黏滞阻尼器,介绍了该自复位黏滞阻尼器的构造方案、工作原理以及理论恢复力模型,分别对自复位黏滞阻尼器的碟簧自复位系统和黏滞耗能系统进行了性能测试,并将两个系统集成为一个整体阻尼器,对其开展力学性能试验研究。研究结果表明:设计的自复位黏滞阻尼器集成了碟簧自复位系统和黏滞耗能系统的优势,具有典型的旗帜形滞回特征,其耗能能力随着加载速率的增大而增大;加载过程中由于黏滞阻尼力的存在而产生的残余变形随着碟簧自复位系统初始预压力的增大而减小,加载结束时该残余变形基本消除。该阻尼器实现了在高加载速率下增强耗能、在低加载速率下提升自复位性能的性能目标。所提出的自复位黏滞阻尼器恢复力模型与试验结果吻合较好。

A preloaded disc spring self-centering viscous damper suitable for self-centering braced frame structure was proposed to address the insufficiency of energy dissipation capacity in the existing self-centering energy dissipation braces.The construction scheme,working principle,and theoretical restoring force model of the self-centering viscous damper were introduced.The performance of the disc spring self-centering system and the viscous energy dissipation system of the self-centering viscous damper was tested,respectively.The two systems were then integrated into an integral damper,and the mechanical properties of the damper were tested.The results show that the designed self-centering viscous damper combines the advantages of the disc spring self-centering system and viscous energy dissipation system and has typical flag-shaped hysteretic characteristics.Its energy dissipation capacity increases with the increase in the loading rate.The residual deformation caused by viscous damping force in the loading process decreases with the increase of the initial pre-pressure of the disc spring self-centering system,and the residual deformation is eliminated at the end of loading.The proposed damper achieves the performance objectives of enhancing energy dissipation at high loading rates and improving self-centering performance at low loading rates.The proposed restoring force model of the self-centering viscous damper is in good agreement with the experimental results.