New Flexible Loading Beam for Bidirectional Real-Time Hybrid Simulation of Reinforced Concrete Columns

IF 4.3 2区工程技术 Q1 ENGINEERING, CIVIL

Earthquake Engineering & Structural Dynamics Pub Date : 2025-03-18 DOI:10.1002/eqe.4342

Yunbyeong Chae, Chunghyun Lee, Jinil Kim

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Abstract

This study presents a novel flexible loading beam (FLB) designed to address the challenges of applying axial force in real time during bidirectional real-time hybrid simulations (RTHSs) of reinforced concrete (RC) columns. The FLB is highly effective for applying axial forces to axially stiff members. However, existing FLBs face challenges in controlling axial force when out-of-plane rotations occur during bidirectional (i.e., two horizontal directions) RTHSs. To address this issue, a new FLB was developed by incorporating a spherical bearing at its central bottom. This design ensures stable force application by allowing free rotation at the column's top while maintaining parallel alignment of the FLB with the ground. Experimental validation was conducted using a multiactuator setup with an RC column subjected to bidirectional horizontal earthquake loads. The results demonstrated the exceptional performance of the new FLB in maintaining precise axial force control, even under significant bidirectional lateral displacements.

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用于钢筋混凝土柱双向实时混合仿真的新型柔性加载梁

本研究提出了一种新型柔性加载梁（FLB），旨在解决钢筋混凝土（RC）柱双向实时混合模拟（RTHSs）过程中实时施加轴力的挑战。FLB对轴向刚性构件施加轴向力是非常有效的。然而，现有的flb在双向（即两个水平方向）rths中发生面外旋转时的轴向力控制方面面临挑战。为了解决这个问题，一种新的FLB被开发出来，在它的中心底部加入了一个球面轴承。这种设计通过允许在柱的顶部自由旋转，同时保持FLB与地面平行对齐，确保稳定的力应用。试验验证采用多驱动器装置，钢筋混凝土柱承受双向水平地震荷载。结果表明，即使在显著的双向侧向位移下，新型FLB也能保持精确的轴向力控制。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Earthquake Engineering & Structural Dynamics 工程技术-工程：地质

CiteScore

7.20

自引率

13.30%

发文量

180

审稿时长

4.8 months

期刊介绍： Earthquake Engineering and Structural Dynamics provides a forum for the publication of papers on several aspects of engineering related to earthquakes. The problems in this field, and their solutions, are international in character and require knowledge of several traditional disciplines; the Journal will reflect this. Papers that may be relevant but do not emphasize earthquake engineering and related structural dynamics are not suitable for the Journal. Relevant topics include the following: ground motions for analysis and design geotechnical earthquake engineering probabilistic and deterministic methods of dynamic analysis experimental behaviour of structures seismic protective systems system identification risk assessment seismic code requirements methods for earthquake-resistant design and retrofit of structures.