【作者】 苏毅；

【导师】 程文瀼；

【作者基本信息】 东南大学 ， 防灾减灾工程及防护工程， 2006， 博士

【摘要】 本文阐述了筒式粘弹性阻尼器的动态力学性能、老化性能和疲劳性能的试验研究,并在此基础上,采用筒式粘弹性阻尼器对合肥奥体中心大悬挑钢网架工程进行了风振控制的理论研究和设计。该工程已建成,取得了很好的社会效益和经济效益。粘弹性材料具有应变滞后于应力的阻尼特性,由它构成的粘弹性阻尼器及消能支撑是一种基本上与速度相关的减振装置,可用于抗风振也可用于抗震。本文对筒式粘弹性阻尼器在不同环境温度、激励频率和应变幅值下的动力性能指标进行了试验研究。试验研究表明,筒式粘弹性阻尼器具有较为稳定的动力性能,耗能能力强,可用于建筑结构在风振或地震下的振动控制。本文还介绍了老化后粘弹性阻尼器的动态力学性能试验,试验结果表明它具有良好的老化性能。同时对筒式粘弹性阻尼器的疲劳性能进行了试验研究,试验结果表明在风振或地震下阻尼器具有较强的耐疲劳性能。众所周知,地震作用强度大、持时短,而风荷载强度相对较小、持时长。当阻尼器应用于建筑物的风振控制时,须考虑荷载循环次数的影响。本文通过试验,研究了滞回圈数对筒式粘弹性阻尼器动态力学性能的影响。本文研究了粘弹性阻尼器用于大悬挑钢网架结构中的风振控制理论和设计方法,对模态应变能法提出了修正,研究了阻尼器的合理布置、消能支撑的竖向控制力、阻尼器的设计和消能支撑的等效刚度和等效耗能因子等问题。最后结合合肥奥体中心综合体育馆大悬挑钢网架屋盖结构,对采用筒式粘弹性阻尼器的风振控制进行了研究。研究表明,在悬挑28.23m的钢网架屋盖中,设置筒式粘弹性阻尼器后能够耗散风振的输入能量,较明显地减小了风振的竖向位移反应。更多还原

【Abstract】 This dissertation describes the studies of the dynamic behaviors, the aging behaviors and the fatigue behaviors for the circular tube viscoelastic dampers. Based on these, the theory studies and design of the wind vibration control for a large cantilevered steel spatial truss with circular tube viscoelastic dampers of the roof engineering at Hefei Olympic Center is finished and this building engineering has been set up and got a good social benefit and economic benefit..The VE material has the damping character that the strain is delayed to the stress, so the VE damper and the energy dissipation braces are basically velocity dependent device of reducing vibration which can be used in seismic structure and wind resistant structure. The dynamic properties of the circular tube VE dampers are tested under different environment temperature, excitation frequencies and shear strain amplitudes. The test results show that the circular tube VE dampers have stable properties and excellent capacity for energy dissipation,which can be used in the vibration control of engineering structure under earthquake or wind loads. The dynamic property tests of the aged circular tube VE dampers are also introduced in this dissertation, and the conclusion is drawn that the circular tube VE damper has good aging property. Meanwhile, the fatigue test of the circular tube VE dampers is performed. The test results indicate that the circular tube VE dampers have good fatigue properties under earthquake action or wind load. It was noted that the earthquake action is different from the wind load. The earthquake action has strong intensity and short duration, but the intensity of wind loading is weaker than that of earthquake action and its duration is longer. When VE dampers are applied to the wind-induced vibration control of buildings, the number of loading cycles must be taken into account in the design. Based on the test results, the effect of the number of hysteretic loops on the mechanical properties of the circular tube VE damper is studied in this dissertation.In this dissertation, the wind-induced vibration control theory and design principle for large cantilevered steel spatial truss are fully studied. Such as modal strain energy method is modified, and the reasonable arrangement of VE dampers, the calculation formula of vertical control force for energy dissipation brace, the design method of circular tube VE damper, the equivalent stiffness and the equivalent stiffness loss factor are introduced.At last it is involved in that the circular tube VE dampers are applied to the large cantilevered steel spatial truss at Hefei Olympic Sports Center to reduce the wind-induced dynamic response. The analytic results show that the vertical displacements of the 28.23m cantilevered steel spatial truss roof are obviously reduced after installing the circular tube VE dampers.更多还原