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首页> 外文期刊>Bulletin of earthquake engineering >Seismic isolation of bridges using isolation systems based on flat sliding bearings
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Seismic isolation of bridges using isolation systems based on flat sliding bearings

机译：使用基于滑动滑动轴承的隔离系统对桥梁进行地震隔离

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Three different isolation systems (IS's) for bridges and viaducts are considered in the present study. All of them are made of steel-PTFE sliding bearings (SB) to support the weight of the deck and auxiliary devices, based on different technologies and materials (i.e. rubber, steel and shape memory alloys), to provide re-centring and/or additional energy dissipating capability. An extensive numerical investigation has been carried out in order to (i) assess the reliability of different design approaches, (ii) compare the response of different types of IS's, (iii) evaluate the sensitivity of the structural response to friction variability due to bearing pressure, air temperature and state of lubrication and (iv) identify the response variations caused by changes in the ground motion, bridge and isolation characteristics. The nonlinear time-history analyses have been carried out using a simplified pier-deck model, where the pier is modelled as an elastic cantilever beam and the mass of the deck is connected to the pier through suitable nonlinear elements, simulating the behaviour of the IS. Both artificial and natural seismic excitations have been used in the nonlinear dynamic analyses.
机译：在本研究中考虑了三种不同的桥梁和高架桥隔离系统（IS）。它们均由钢-PTFE滑动轴承（SB）制成，以支撑甲板和辅助设备的重量，基于不同的技术和材料（例如橡胶，钢和形状记忆合金），以提供重心和/或额外的耗能能力。进行了广泛的数值研究，以（i）评估不同设计方法的可靠性，（ii）比较不同类型的IS的响应，（iii）评估结构响应对轴承引起的摩擦变化的敏感性。压力，空气温度和润滑状态;以及（iv）确定由地面运动，桥梁和隔离特性的变化引起的响应变化。使用简化的码头-甲板模型进行了非线性时程分析，其中将码头建模为弹性悬臂梁，并通过合适的非线性元素将甲板的质量连接到码头，以模拟IS的行为。 。非线性和动态分析都使用了人工和自然地震激励。

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