悬挂内筒烟囱风振控制

研究利用转动摩擦阻尼器(rotational friction hinge dampers, RFD)对高耸钢筋混凝土悬挂内筒烟囱进行风致振动被动控制。提出新型RFD-止晃节点构造,对该摩擦阻尼-悬挂内筒烟囱体系进行风振控制研究,基于Lagrange方程推导受控体系的非线性运动微分方程及其空间状态方程。以某275 m高烟囱为例,采用谐波叠加法模拟了脉动风荷载时程,对比分析5种减振方案。通过选用合理的RFD参数、合理地布置RFD和选择合适的悬挂内筒长度,能获得满意的减振效果。与常用的风振控制装置调频质量阻尼器(tuned mass damper, TMD)、调频液体阻尼器(tuned liquid damper, TLD)相比,RFD质量小,体积小,不影响烟囱内部空间正常使用,具有更大优越性。

Wind induce vibration control of chimney with suspended flue

The wind induced vibration control of a high rise reinforced concrete chimney with suspended flues(CSMF)was conducted by using rotational friction dampers(RFD). The detailing of a RFD restraint joint was presented. The wind induced vibration control effect was firstly investigated, and the state space formulation of the equation of motion of CSMF was derived based on Lagrange's equations. A CSMF of 175 m high was then taken an example to investigate the feasibility of the proposed control strategy. Five vibration control schemes were compared and the results showed that the vibration of CSMF could be substantially suppressed by using RFD with optimal parameters, position and suspended flue length. FRD was superior to TMD due to its small auxiliary mass and little space occupation.