【摘要】 分析了风振条件下大跨度屋盖结构中悬挑竖向位移的控制方法,指出传统的模态应变能法因忽略阻尼器的耗能刚度部分可能产生较大误差,并对此给出了修正方法。推导了附加消能支撑的竖向控制力、等效刚度和等效耗能因子公式。根据上述方法和公式,对一大悬挑屋盖结构进行了风振控制设计。经实例应用说明,笔者提出的风振控制设计方法方便实用。更多还原

【Abstract】 The vertical displacement response of large cantilevered roof structure,which is sensitive to wind load,is easy to exceed the code prescript.For mitigating wind-induced vibration and improving structure vibration behavior,the viscoelastic dampers are a good choice to control the response of the large cantilevered roof structure.On the procedure of vibration control design,model strain energy method is pivotal to get design parameters.When the material loss factor is high,traditional modal strain energy method may produce relative great error.A revised modal strain energy method is presented to improve the analysis accuracy.The calculation formula of vertical control force,the equivalent stiffness and the equivalent loss factor of energy dissipation brace are introduced.With the guide of design procedure,the wind-induced vibration control design for a large cantilevered steel roof structure is given.The design procedure of wind-induced vibration control for large cantilevered steel roof structure is very convenient and practical for structure engineers.更多还原