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Achieving reliable seismic performance enhancement using multi-stage friction pendulum isolators

机译：使用多级摩擦摆式隔振器实现可靠的地震性能增强

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摘要

An objective in the design of seismically isolated structures is the selection of isolator properties so that performance enhancements are reliably achieved over a range of excitations and performance metrics. A challenge in the design of isolation systems is that, to withstand very severe or near-fault motions, bearings often become so large, stiff and strong that they provide little isolation during moderate seismic events. Numerical investigations are presented to characterize the performance of a new multi-stage friction pendulum (FP) isolation bearing, capable of progressively exhibiting different hysteretic properties at various levels of displacement demand. The feasibility of targeting these properties to achieve specific performance goals for a range of ground motion intensities and structural dynamic characteristics is investigated. In particular, the trade-off between limiting very rare isolator displacement demands and inducing high inter-story drift and floor accelerations is examined for a range of levels of seismic hazard. Nonlinear dynamic analyses of realistic building systems are presented, including a description of key structural demand parameters. To investigate the potential performance benefits of innovative devices, a complex multi-level performance objective termed a seismic performance classification is introduced. Results indicate that multi-stage FP bearings show improved reliability of meeting seismic performance objectives when multiple levels of seismic intensity are considered compared to those systems that incorporate conventional bilinear hysteretic energy dissipation mechanisms.
机译：地震隔离结构设计的目标是选择隔离器属性，以便在一系列激励和性能指标范围内可靠地实现性能增强。隔离系统设计中的一个挑战是，为了承受非常严重或接近故障的运动，轴承通常会变得很大，刚硬而坚固，以至于在中等地震事件中几乎无法提供隔离。本文进行了数值研究，以表征新型多级摩擦摆式（FP）隔离轴承的性能，该轴承能够在各种位移需求水平上逐渐展现出不同的滞后特性。研究了针对这些特性以实现一系列地面运动强度和结构动力特性的特定性能目标的可行性。特别是，针对一定范围的地震危险，研究了在限制非常罕见的隔振器位移要求与引起较高的层间漂移和地板加速度之间的权衡。提出了对现实建筑系统的非线性动力分析，包括对关键结构需求参数的描述。为了研究创新设备的潜在性能优势，引入了称为地震性能分类的复杂多级性能目标。结果表明，与考虑了传统双线性滞回耗能机制的系统相比，当考虑多个水平的地震烈度时，多级FP轴承具有更高的可靠性，可以满足地震性能目标。

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