7度区某学校消能减震设计分析

The Energy Dissipation Shock Absorption Design and Analysis of a School in the Seismic Region of 7-level Intensity

结合宁波市某中学项目,探讨7度区重点设防类结构的减震设计:采用剪切型金属阻尼器作为耗能部件,利用PKPM和SAP2000等软件对该结构进行减震计算分析,从阻尼器出力与楼层剪力之比及层间位移角这两个指标对阻尼器的受力进行了分析。结果表明:采用该方案的消能减震结构,在多遇地震下阻尼器未屈服,仅提供一定的附加刚度,不提供附加阻尼比,阻尼器出力不小于层间剪力的15%。在罕遇地震作用下,各金属阻尼器均进入塑性滞回耗能,减震结构与非减震结构的水平位移比小于0.76,阻尼器发挥了良好的耗能能力,为结构主体提供了良好的安全储备。

In this paper,a middle school building with damping design as a key fortification structures in the seismic region of 7?level intensity was discussed.A shear metal damper used as the energy disspation component in this project was calculated and analyzed by the software of PKPM and SAP2000.The indexes of the ratio of damper force with the storey shear and the inter floor displacement angle were analyzed.The results indicate that the damper not yielding only provides a certain additional stiffness without additional damping ratio and outputs the damper force less than 15%of the inter layer shear force under the frequent earthquake,while the metal dampers enter the plastic hysteretic energy dissipation,and the horizontal displacement ratio of damping structure and non-damping structure is less than 0.76 under the rare occurrence earthquake.As a result,the dampers play a good energy dissipation capacity and provide good safety reserve for the main structure.