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首页> 外文期刊>The Open Construction & Building Technology Journal >Nonlinear Dynamic Response of RC Buildings with Different BaseIsolation Systems Subjected to Horizontal and Vertical Components ofNear-Fault Ground Motions
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Nonlinear Dynamic Response of RC Buildings with Different BaseIsolation Systems Subjected to Horizontal and Vertical Components ofNear-Fault Ground Motions

机译：受近断层地震动水平和垂直分量影响的具有不同基础隔震系统的RC建筑物的非线性动力响应

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Near-fault ground motions are characterized by long-duration horizontal pulses and high values of the peakvertical acceleration, which can become critical for a base-isolated structure. In order to check if current code provisionscan be considered adequate for the design of base-isolated structures located in a near-fault area, base-isolated five-storeyr.c. framed buildings with elastomeric bearings acting alone (“Base Isolation” system) or combined in parallel or in serieswith sliding bearings (“Base Isolation and in-Parallel Sliding”, BIPS, or “Base Isolation and in-Series Sliding”, BISS, systems)are studied. The base-isolated structures are designed assuming the same values for the fundamental vibration periodand equivalent viscous damping in the horizontal direction. Different values of the stiffness ratio, defined as the ratiobetween the vertical and horizontal stiffness of the elastomeric bearings, are considered; moreover, different values of thesliding ratio, defined as the global sliding force corresponding to an examined BIPS or BISS system divided by the maximumsliding force (in the case of a sliding bearing under each column), are also assumed. The nonlinear analysis of thetest structures subjected to strong near-fault ground motions is performed using a step-by-step procedure based on a twoparameterimplicit integration scheme and an initial-stress-like iterative procedure. At each step of the analysis, plasticconditions are checked at the potential critical sections of the girders (i.e. end sections of the sub-elements in which agirder is discretized) and columns (i.e. end sections), where a bilinear moment-curvature law is adopted. The response ofan elastomeric bearing is simulated by a model with variable stiffness properties in the horizontal and vertical directions,depending on the axial force and lateral deformation, and linear viscous damping. Finally, a rigid-plastic (with frictionvariability) law is assumed to simulate the behaviour of a sliding bearing.
机译：接近故障的地面运动的特点是持续时间较长的水平脉冲和峰值垂直加速度的高值，这对于基础隔离结构可能至关重要。为了检查当前的规范规定是否可以认为足以用于位于断层附近区域的基础隔离结构的设计，基础隔离的五层楼c。框架式建筑物，其弹性轴承单独运行（“基础隔离”系统），或与滑动轴承并联或串联组合（“基础隔离和平行滑动”，BIPS，或“基础隔离和串联滑动”，BISS，系统） ）进行了研究。基础隔震结构的设计假定基本振动周期的值相同，并且水平方向的等效粘性阻尼相同。考虑不同的刚度比值，定义为弹性轴承的垂直和水平刚度之比;此外，还假定了不同的滑动率值，该值定义为与检查的BIPS或BISS系统相对应的总滑动力除以最大滑动力（在每列下方为滑动轴承的情况下）。使用基于两参数隐式积分方案和类似于初始应力的迭代程序的分步过程，对经受强近断层地震动的测试结构进行了非线性分析。在分析的每个步骤中，在采用双线性弯矩曲率定律的梁的潜在关键部分（即离散化梁的子元素的末端部分）和圆柱（即末端部分）中检查塑性条件。 。弹性轴承的响应是通过一个模型来模拟的，该模型在水平和垂直方向上具有可变的刚度特性，具体取决于轴向力和横向变形以及线性粘性阻尼。最后，假定使用了刚塑性（具有摩擦可变性）定律来模拟滑动轴承的行为。

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