摩擦阻尼器支撑刚度对结构耗能特征的影响

根据双板型摩擦阻尼器的结构特点,分析了该摩擦阻尼器的工作特性,建立了使用该摩擦阻尼器的结构动力方程,并从实际结构各层摩擦阻尼器的支撑刚度出发,计算讨论了由摩擦阻尼器支撑刚度与结构层间刚度关系的不同导致的摩擦阻尼器耗能特性的差异,由此得出摩擦阻尼器的支撑刚度与结构层间刚度之间的关系对结构响应的影响,探讨了摩擦阻尼器支撑刚度与结构层间刚度之间的关系对实际结构各层摩擦阻尼器滞回特性和地震时程响应的影响,提出如何改变摩擦阻尼器的支撑刚度以使各层摩擦阻尼器耗能特性最佳的解决方案。

THE PARAMETER ANALYSIS FOR INITIAL SLIPPAGE OF FRICTION DAMPED SYSTEMS AND ENERGY DISSIPATION

Based on the characteristic of double board friction damper,the peculiarity of it is analyzed and the dynamic equation is also established,and then,the equivalent stiffness and damping concerning double board friction damper are also obtained.Furthermore,according to the brace stiffness of the friction damper,the energy dissipation discrepancy owing to the brace stiffness and storey stiffness has been emphasized,which educes the response specialty of the friction damper due to the brace stiffness.In succession,storey displacement is also debated,which fetches the diversities of energy dissipation about structures.For the sake of analyzing the discrepancies,hysteretic properties with regard to double board friction damper is discussed,firstly,hysteretic loops are gained when the brace stiffness concerning all floors is uniform,secondly,hysteretic loops are gained when the brace stiffness concerning all floors is different,through investigating the distinction,by which it is found out the reason that altering brace stiffness can influence the characteristic of energy dissipation about double board friction damper.Eventually, the correlation among brace stiffness,hysteretic properties and time history response is exhaustively discussed and the method which attains the prime energy dissipation is ultimately gained.