软钢阻尼器在某高烈度区医院减震设计中的应用研究

Study on the application of mild steel dampers in the design of seismic reduction in a hospital in a high seismic intensity region

以某高烈度区的医院住院楼结构工程为例,利用有限元软件SAP2000对使用软钢阻尼器的结构进行了消能减震的设计分析。从阻尼器提供的附加阻尼比、阻尼器出力与楼层剪力之比和层间位移角这3个指标对软钢阻尼器的耗能能力进行了分析。结果表明:多遇地震作用下,安装阻尼器楼层的阻尼器出力与楼层剪力之比均高于19%,软钢阻尼器可以分别为结构的X向和Y向提供7.38%和7.23%的附加阻尼比;大震作用下,消能减震系统仍能正常发挥其耗能能力,对比无控结构,减震结构的X向和Y向的最不利层间位移角降幅分别为27.2%和32.9%,同时也保证了结构大震下的抗倒塌能力。

Taking the structural engineering of a hospital inpatient building in a high intensity region as an example, the design analysis of the structure using mild steel dampers for energy dissipation and seismic damping was carried out by using the finite element software SAP2000.The energy dissipation capacity of the mild steel dampers was analyzed in terms of three indicators: the additional damping ratio provided by the dampers, the ratio of the dampers’ output force to the inter-storey shear force and the inter-storey displacement angle.The results show that under the action of multiple earthquakes, the ratio of damper output to floor shear of the floors with dampers is higher than 19%,and the mild steel dampers can provide additional damping ratio of 7.38% and 7.23% for the X-direction and Y-direction of the structure respectively;under the action of large earthquakes, the energy dissipation and damping system can still play its energy dissipation capacity normally, and compared with the uncontrolled structure, the decreases of the most unfavorable inter-story displacement angles of the damping structure in the X-direction and Y-direction are 27.2% and 32.9% respectively, which also ensures the collapse resistance of the structure under large earthquakes.