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首页> 外文期刊>Soil Dynamics and Earthquake Engineering >A novel OpenSees element for single curved surface sliding isolators
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A novel OpenSees element for single curved surface sliding isolators

机译：用于单曲面滑动隔离器的新颖OpenSees元件

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The increasing use of curved surface sliding bearings as seismic isolators benefits from the improvement of analytical models that can accurately capture their experimental performance and enhance the predictive capability of nonlinear response history analyses. The mathematical formulation proposed in this paper aims at addressing the variability of the coefficient of friction based on experimental data that can be retrieved from prototype tests on Curved Surface Sliders. The formulation accounts for variation in the coefficient of friction with the instantaneous change of axial load and sliding velocity at the contact interface, and the accumulated heat due to cyclic motion; furthermore, it incorporates new features such as the static friction developed in the transition from the pre-sliding phase to the dynamic sliding condition. The proposed model has been coded in the object-oriented finite element software OpenSees by modifying the standard SingleFPSimple3d element that describes the force - displacement relationship of a bearing comprising one concave sliding surface and a spherical articulation. The main novelties of the new CSSBearing_BVNC element are inclusion of the static friction before the breakaway and degradation of kinetic friction induced by the heat developed during the motion of the articulated slider. The primary assumptions in the development of the friction model and the verification of the newly developed element are validated by agreement with available data. A case study helps to demonstrate the improved prediction capability of the new bearing element over its standard counterpart when applied to real situations, such as estimating a +50% increase in isolator displacement, superstructure drift and base shear demand under high intensity earthquakes, and possible non-activation of the sliding isolators under weak or medium intensity earthquakes.
机译：曲面滑动轴承作为隔震器的使用越来越多，得益于分析模型的改进，该模型可以准确地捕获其实验性能并增强非线性响应历史分析的预测能力。本文提出的数学公式旨在基于可从曲面滑动器原型测试中检索到的实验数据解决摩擦系数的变化性。该公式考虑了摩擦系数随接触面轴向载荷和滑动速度的瞬时变化以及循环运动引起的累积热量的变化；此外，它还具有新功能，例如在从预滑动阶段到动态滑动状态的过渡过程中产生的静摩擦。通过修改标准SingleFPSimple3d元素，该模型已在面向对象的有限元软件OpenSees中进行了编码，该标准描述了包含一个凹形滑动表面和球形关节的轴承的力-位移关系。新型CSSBearing_BVNC元件的主要新颖之处在于包含了分离前的静摩擦以及由铰接滑块运动期间产生的热量引起的动摩擦的降低。摩擦模型的开发和新开发元素的验证中的主要假设均通过与可用数据的一致验证。案例研究有助于证明在实际应用中，新轴承元件比标准轴承元件具有更高的预测能力，例如估计高强度地震下隔离器位移增加50％，上部结构漂移和基础剪力需求增加以及可能的情况。在弱或中等强度地震中不激活滑动隔离器。

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