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Real-time hybrid simulation for an RC bridge pier subjected to both horizontal and vertical ground motions

机译：水平和垂直地震动对RC桥墩的实时混合仿真

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It is well known that real-time hybrid simulation (RTHS) is an effective and viable dynamic testing method. Numerous studies have been conducted for RTHS during the last 2 decades; however, the application of RTHS toward practical civil infrastructure is fairly limited. One of the major technical barriers preventing RTHS from being widely accepted in the testing community is the difficulty of accurate displacement control for axially stiff members. For such structures, a servo-hydraulic actuator can generate a large force error due to the stiff oil column in the actuator even if there is a small axial displacement error. This difficulty significantly restricts the implementation of RTHS for structures such as columns, walls, bridge piers, and base isolators. Recently, a flexible loading frame system was developed, enabling a large-capacity real-time axial force application to axially stiff members. With the aid of the flexible loading frame system, this paper demonstrates an RTHS for a bridge structure with an experimental reinforced concrete pier, which is subjected to both horizontal and vertical ground motions. This type of RTHS has been a challenging task due to the lack of knowledge for satisfying the time-varying axial force boundary condition, but the newly developed technology for real-time force control and its incorporation into RTHS enabled a successful implementation of the RTHS for the reinforced concrete pier of this study.
机译：众所周知，实时混合仿真（RTHS）是一种有效且可行的动态测试方法。在过去的20年中，对RTHS进行了大量研究。但是，RTHS在实际民用基础设施中的应用相当有限。阻止RTHS在测试界被广泛接受的主要技术障碍之一是难以对轴向​​刚性构件进行精确的位移控制。对于这样的结构，即使有小的轴向位移误差，伺服液压致动器也会由于致动器中的硬油柱而产生大的力误差。这一困难极大地限制了RTHS在诸如柱，墙，桥墩和基础隔离器等结构中的实施。最近，开发了一种灵活的加载框架系统，该系统可以向轴向刚体施加大容量实时轴向力。借助柔性荷载框架系统，本文演示了带有实验钢筋混凝土桥墩的桥梁结构的RTHS，该桥墩在水平和垂直方向上均受到地震动的影响。由于缺乏满足时变轴向力边界条件的知识，这种类型的RTHS一直是一项艰巨的任务，但是新开发的实时力控制技术及其与RTHS的结合使RTHS得以成功实施。这项研究的钢筋混凝土墩。

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