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首页> 外文期刊>Earthquake Engineering & Structural Dynamics >Seismic reliability-based ductility demand evaluation for inelastic base-isolated structures with friction pendulum devices
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Seismic reliability-based ductility demand evaluation for inelastic base-isolated structures with friction pendulum devices

机译：基于摩擦可靠度的非弹性基础隔震结构基于地震可靠性的延性需求评估

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The aim of this work is to propose seismic reliability-based relationships between the strength reduction factors and the displacement ductility demand of nonlinear structural systems equipped with friction pendulum isolators (FPS) depending on the structural properties. The isolated structures are described by employing an equivalent 2dof model characterized by a perfectly elastoplastic rule to account for the inelastic response of the superstructure, whereas, the FPS behavior is described by a velocity-dependent model. An extensive parametric study is carried out encompassing a wide range of elastic and inelastic building properties, different seismic intensity levels and considering the friction coefficient as a random variable. Defined a set of natural seismic records and scaled to the seismic intensity corresponding to life safety limit state for L'Aquila site (Italy) according to NTC08, the inelastic characteristics of the superstructures are designed as the ratio between the average elastic responses and increasing strength reduction factors. Incremental dynamic analyses (IDAs) are developed to evaluate the seismic fragility curves of both the inelastic superstructure and the isolation level assuming different values of the corresponding limit states. Integrating the fragility curves with the seismic hazard curves related to L'Aquila site (Italy), the reliability curves of the equivalent inelastic base-isolated structural systems, with a design life of 50years, are derived proposing seismic reliability-based regression expressions between the displacement ductility demand and the strength reduction factors for the superstructure as well as seismic reliability-based design (SRBD) abacuses useful to define the FPS properties. Copyright (c) 2016 John Wiley & Sons, Ltd.
机译：这项工作的目的是根据结构特性提出基于强度折减系数与非线性结构系统（配备摩擦摆式隔离器（FPS））的位移延性要求之间基于地震可靠性的关系。通过采用等效的2dof模型来描述孤立的结构，该模型的特征是具有完美的弹塑性法则以解释上部结构的非弹性响应，而FPS行为则由速度相关模型来描述。进行了广泛的参数研究，涵盖了广泛的弹性和非弹性建筑特性，不同的地震烈度水平，并将摩擦系数视为随机变量。根据NTC08，定义了一组自然地震记录，并按与意大利L'Aquila工地的生命安全极限状态相对应的地震烈度进行缩放，将上部结构的非弹性特征设计为平均弹性响应与强度增加之间的比率减少因素。在假定相应极限状态值不同的情况下，开发了增量动力分析（IDA）来评估非弹性上部结构和隔离层的地震脆性曲线。将脆性曲线与与意大利拉奎拉（L'Aquila）站点有关的地震危险曲线相结合，得出等效无弹性基础隔震结构系统（设计寿命为50年）的可靠性曲线，并提出了基于地震可靠性的回归表达式。位移延展性需求和上部结构的强度折减系数以及基于地震可靠性的设计（SRBD）算盘可用于定义FPS属性。版权所有（c）2016 John Wiley＆Sons，Ltd.

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