自复位复合阻尼耗能支撑滞回性能研究

Study on the hysteretic performance of a self-centering composite damping energy dissipation brace

为解决自复位支撑耗能能力不足且来源单一、耗能材料成本高昂的问题,提出了一种新型自复位复合阻尼耗能支撑。支撑由金属屈服阻尼装置、黏弹阻尼装置并联预压碟簧自复位装置组成。对其基本构造和工作原理进行阐述,通过精细化模拟研究了支撑的耗能、复位、承载和变形能力。结果表明,在往复荷载作用下,支撑的滞回响应具有稳定饱满的旗形特征,拉压对称、无残余变形,能够兼顾不同加载频率下的性能需求。揭示了支撑加载制度和设计参数对其滞回性能的影响规律,结果表明:加载频率从0.3 Hz增加到2.0 Hz,黏弹阻尼装置提供的阻尼力增大,支撑耗能量由8.32 kJ增加到11.93 kJ;随着碟簧预压力的增加,支撑激活力从378.98 kN增加到562.67 kN,复位性能始终得到充分发挥;支撑耗能能力主要受三角形钢板个数和黏弹材料剪切面面积影响,增加4个三角形钢板或将黏弹材料剪切面面积从140 mm×140 mm增加到300 mm×140 mm,支撑的等效黏滞阻尼比分别同比增长39.93%和16.09%。

In order to solve the problem of insufficient capacity and only single source of energy dissipation,and high cost of energy dissipation materials in self-centering braces,a new type of self-centering composite damping energy dissipation brace was proposed.The brace was composed of a metal yielding damping device and a viscoelastic damping device,which were connected in parallel with a recentering device with pre-pressed disc springs.The basic configuration and working principle of the brace were introduced,and the energy dissipation,recentering,bearing and deformation capacities of the brace were studied by refined numerical simulation.It is shown that under the action of reciprocating loading,the hysteretic response of the brace exhibits a stable and full flag-shaped characteristic,with symmetrical tension and compression capacities and no residual deformation,which can meet the behavior requirements under different loading frequencies.The effects of the loading scheme and design parameters of the brace on its hysteretic performance were analyzed.The results show that when the loading frequency increases from 0.3 Hz to 2.0 Hz,the damping force provided by the viscoelastic damping device increases,and the energy dissipation of the brace increases from 8.32 kJ to 11.93 kJ.With the increase of the pre-pressed force of disc springs,the activation force of brace increases from 378.98 kN to 562.67 kN,and its recentering capability is always fully utilized.The energy dissipation capacity of the brace is mainly affected by the number of triangular steel plates and the shear surface area of viscoelastic material.When the number of triangular steel plates increases by 4,or the shear surface area of viscoelastic material increases from 140 mm×140 mm to 300 mm×140 mm,the equivalent viscous damping ratios of the brace respectively increase by 39.93%and 16.09%.