【摘要】 摩擦阻尼器是一种构造简单的耗能减振装置，已应用于国内外多座新建建筑的抗震设计和已建建筑的抗震加固．半主动磨擦阻尼器则通过调整阻尼器的起滑力来改善被动摩擦阻尼器的耗能减振性能。本文研究了被动及半主动摩擦阻尼器对于高耸塔架结构地震反应的减振效果。为满足摩擦阻尼器对高耸塔架结构风振控制的特殊需要，本文建立了合肥电视塔的空间桁架有限元模型和串联多自由度体系模型，并在形成控制力变换矩阵和计算摩擦阻尼器两端的相对位移的过程中综合地运用了这两种力学模型。在半主动摩擦阻尼器的控制策略方面，本文提出了一种基于次优控制理论的半主动控制策略．本文研究表明，摩擦阻尼器可以抑制高耸塔架结构的地震反应．而半主动摩擦阻尼辞的耗能减振效果明显优于被动摩擦阻尼器．更多还原

【Abstract】 As a kind of energy dissipating device in simple configuration, friction dampers have been used in several buildings, either as earthquake-resistant devices for new-built buildings or as reinforcing devices for existing buildings. Semi-active dampers have been designed toimprove the vibration abating performance of passive dampers by modifying the contact force of friction dampers. This paper studies the application of passive and semi-active friction dampers to seismic vibration control of Hefei TV tower. To meet the particularity of dynandcal analysis of friction-damped high-rise truss tower, this paper constructS two mechanic models:one is three-dimensional finite element static model and the other is two-dimensional lumped-mass dynaAnc model for Hefei TV tower’s vibration control study.The two mechanic models are comprehensively used in establishing the control force transforming matrix and computing the relative displacement of the two ends of an arbitrarily located friction damper. A semi-active control strategy, which is based upon second-optimal control theory is put forward as the control algorithm of semi-active dampers. The studies of this paper confirm the feasibility of the innovated method in the dynamical response analysis for friction-damped high-rise truss tower and the semi-active control algorithm, as well as the effectiveness of passive and semi-active friction damper in abating the seisAnc vibration responses.更多还原