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首页> 外文期刊>Soil Dynamics and Earthquake Engineering >Stochastic energy measures for hybrid base isolation systems
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Stochastic energy measures for hybrid base isolation systems

机译：混合基础隔离系统的随机能量措施

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Two R/C residential buildings were retrofitted by using a hybrid base isolation system in Solarino, Sicily, in 2004 and subsequently five free vibration tests were carried out in one of these buildings. The hybrid base isolation system combined high damping rubber bearings with low friction teflon sliders. For numerical modeling purposes, a single-degree-of-freedom system was developed with a new trilinear hysteretic model for the simulation of the high damping rubber bearing response, coupled with a Coulomb friction model for the simulation of the low friction slider response. Five sets of data were obtained from initial-displacement, free vibration tests and were subsequently used for the calibration of this six parameter model. Following up on the numerical model development, the present study employs Monte-Carlo simulations in order to investigate the effect of variations in the values of the six-parameter model on the response of the hybrid base isolation system. The calibrated parameters' values from the experiments are used as mean values, while the standard deviation for each parameter is deduced from the identification tests employing best-fit optimization for each experiment separately. The results of the Monte-Carlo simulations show a non-stationary effect in the response, which can be traced by the time evolution of the standard deviation of various energy measures computed at different time instants. The high level of nonlinearity in the base isolation system response due to large initial displacements helps explain the previously described effects.
机译：2004年，通过使用西西里岛索拉里诺的混合基础隔离系统对两栋R / C住宅建筑物进行了翻新，随后在其中一栋建筑物中进行了五次自由振动测试。混合基础隔离系统将高阻尼橡胶轴承与低摩擦特氟隆滑块组合在一起。为了进行数值建模，开发了具有新三线性滞后模型的单自由度系统，用于模拟高阻尼橡胶轴承响应，以及用于模拟低摩擦滑块响应的库仑摩擦模型。从初始位移，自由振动测试中获得了五组数据，随后将其用于这六个参数模型的校准。继数值模型开发之后，本研究采用蒙特卡洛模拟，以研究六参数模型的值变化对混合基础隔离系统响应的影响。来自实验的校准参数值被用作平均值，而每个参数的标准偏差则是通过针对每个实验分别采用最佳拟合优化的鉴定测试得出的。蒙特卡洛模拟的结果显示了响应中的非平稳效应，这可以通过在不同时刻计算出的各种能量度量标准偏差的时间演变来追踪。由于较大的初始位移，基本隔离系统响应中的高度非线性有助于解释上述影响。

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