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Response of hybrid isolation system during a shake table experiment of a full-scale isolated building

机译：混合隔离系统在大型隔震建筑振动台试验中的响应

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A full-scale 5-story steel moment frame building was subjected to a series of earthquake excitations using the E-Defense shake table in August, 2011. For one of the test configurations, the building was seismically isolated by a hybrid system of lead-rubber bearings and low friction roller bearings known as cross-linear bearings, and was designed for a very rare 100000-year return period earthquake at a Central and Eastern US soil site. The building was subject to 15 trials including sinusoidal input, recorded motions and simulated earthquakes, 2D and 3D input, and a range of intensities including some beyond the design basis level. The experimental program was one of the first system-level full-scale validations of seismic isolation and the first known full-scale experiment of a hybrid isolation system incorporating lead-rubber and low friction bearings. Stable response of the hybrid isolation system was demonstrated at displacement demands up to 550mm and shear strain in excess of 200%. Torsional amplifications were within the new factor stipulated by the code provisions. Axial force was observed to transfer from the lead-rubber bearings to the cross-linear bearings at large displacements, and the force transfer at large displacements exceeded that predicted by basic calculations. The force transfer occurred primarily because of the flexural rigidity of the base diaphragm and the larger vertical stiffness of the cross-linear bearings relative to the lead-rubber bearings.
机译：2011年8月，使用E-Defense振动台对一幢5层高的全钢框架结构房屋进行了一系列地震激发。对于其中一种测试配置，该建筑物采用铅-铅混合动力系统进行地震隔离。橡胶轴承和低摩擦滚子轴承，称为交叉线性轴承，被设计用于在美国中部和东部土壤站点发生非常罕见的100000年回归期地震。该建筑经过了15次试验，包括正弦波输入，记录的运动和模拟地震，2D和3D输入以及一系列强度，其中包括一些超出设计基准水平的强度。该实验程序是地震隔离的第一个系统级全面验证之一，并且是结合铅橡胶和低摩擦轴承的混合隔离系统的第一个已知的全面实验。在位移要求高达550mm和剪切应变超过200％时，证明了混合隔离系统的稳定响应。扭转放大率在规范规定的新因素之内。观察到大位移时轴向力从铅橡胶轴承传递到交叉直线轴承，并且大位移时的力传递超过了基本计算所预测的。发生力传递的主要原因是，基础隔膜的抗弯刚度和十字形轴承相对于铅橡胶轴承的更大的垂直刚度。

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