黏滞阻尼器伸臂桁架布置对超高层结构减震性能影响研究

The Effect of the Configurations of Viscous Damped Outriggers on the Seismic Performance of a Super-Tall Building

在超高层结构中,传统伸臂桁架能显著提高结构抗侧刚度、减小结构侧移,但给结构带来刚度、内力突变等不利影响,形成结构薄弱层。黏滞阻尼器伸臂桁架因其在一定程度上减小结构刚度、提供附加阻尼比,成为近年高层建筑结构抗震与抗风的新型体系。针对一226 m超高层结构中某一榀平面框架-剪力墙,在伸臂桁架中布置黏滞阻尼器,对比分析5种不同黏滞阻尼器布置方案伸臂桁架结构在多遇地震、设防地震和罕遇地震作用下的消能减震效果,将为黏滞阻尼器在超高层结构伸臂桁架中的进一步研究和应用提供借鉴。

In super-tall structures, the traditional outrigger can significantly enhance the lateral stiffness and decrease the lateral deflection of the structure, however, it also bring adverse effects. For example, a weak story would be formed for abrupt changes of the structural stiffness and internal force. Viscous damper outriggers can reduce the stiffness of the structure to a certain extent and provide structure supplemental damping ratio. It has become a new structure system for the seismic and wind resistance of the super-tall structure in recent years. Based on a plane frame shear wall structure taken from a 226-meter super-tall structure, viscous dampers were introduced to the outriggers of the structure. Then, the of damped outriggers were analyzed under frequent, seismic energy dissipation effects of five different types moderate and rare earthquakes. The conclusions would provide reference and guidance for the further research and application of damped outriggers in super-tall buildings.