Performance of viscous fluid dampers coupling adjacent inelastic structures under near-fault earthquakes

The behavior of viscous fluid damper applied in coupling structures subjected to near-fault earthquake was studied.The structural nonlinearity was characterized by Bouc-Wen model and several near-fault ground motions were simulated by the combination of a recorded earthquake(background ground motion) with equivalent velocity pulses that possess near-fault features.Extensive parametric studies were carried out to find the appropriate damping coefficient.Performances of viscous fluid dampers were demonstrated by the relationship between the force and displacement,the maximal damper force and stroke.The control performances were demonstrated in terms of the response reductions of adjacent structures.The results show that the dynamic responses of adjacent structures are mitigated greatly.Proper damping coefficients of connecting fluid dampers have a small difference,while adjacent structures under different near-fault ground motions with the same peak acceleration.The maximum force of damper is about 0.8 MN,and the maximum damper stroke is about ±550 mm.Satisfied viscous fluid dampers can be produced according to the current manufacturing skills.

国家速滑馆主体结构设计

国家速滑馆是北京2022年冬奥会的标志性场馆,屋盖采用单层双向正交索网,外圈设巨型环桁架,支承于看台斜柱上,支承屋盖的看台斜柱采用劲性混凝土柱。着重阐述了国家速滑馆主体结构设计中的一些关键问题及相应的处理措施,包括结构的基础设计、超限情况及抗震性能化设计、大震弹塑性、巨型柱承载力计算等,为类似工程设计提供参考。