宽温域环境下黏弹性减震框架结构混合试验研究

Study on hybrid test of viscoelastic damping frame structures under broad temperature domain

为了研究温度对黏弹性减震框架结构动力响应的影响规律,对1个5层黏弹性减震框架结构在宽温域环境下进行了地震模拟混合试验。提出了求解黏弹性减震框架结构(子结构在不同楼层)的混合试验运动方程的方法。进行了一系列不同温度下黏弹性减震框架结构的混合试验,并对试验结果进行对比分析。研究结果表明:黏弹性阻尼器(VED)对结构动力响应有着较好的控制作用;随着温度升高,VED对结构位移和加速度的控制效果基本均呈逐渐减弱趋势,且减弱速率逐渐减小;VED的滞回曲线饱满程度、耗能效率和力峰值均逐渐降低且降低速率逐渐减小;各环境温度下,VED对加设层的位移和加速度控制效果均最好,对其他层的控制效果均基本随与加设层距离的增加而逐渐减弱,且减弱速率逐渐减小;随着加设楼层的升高,VED耗能和力峰值对低温的敏感程度逐渐增大。

In order to study the influence rule of temperature on the dynamic response of the viscoelastic damping frame structure,a five-story viscoelastic damping frame structure was subjected to a hybrid test of seismic simulation under wide temperature domain.A method for solving the motion equation of the hybrid test for the viscoelastic damping frame structure(with substructures on different floors)was proposed.A series of hybrid tests for the viscoelastic damping frame structure at different temperatures were carried out,and the test results were analyzed comparatively.The research results show that the viscoelastic damper(VED)has a superior control effect on the dynamic response of the structure.As the temperature increases,the control effect of VED on the displacement and acceleration of the structure basically presents a gradual weakening trend,and the weakening rate is gradually decreasing.The plumpness of the hysteresis curve,energy dissipation efficiency,and peak force of VED gradually decrease,and the reduction rate gradually decreases.At each ambient temperature,the VED has the best control effect on the displacement and acceleration of the additional story.The control effect on other stories is gradually weakened with the increase of the distance from the additional story,and the weakening rate is gradually decreasing.With the rise of additional stories,the sensitivity of VED energy dissipation and peak force to low temperature gradually increases.