加州大学圣地亚哥分校 NHERI 六自由度大型高性能室外振动台动态模型

IF 4.3 2区 工程技术 Q1 ENGINEERING, CIVIL Earthquake Engineering & Structural Dynamics Pub Date : 2024-09-06 DOI:10.1002/eqe.4224
Chin-Ta Lai, Joel P. Conte
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引用次数: 0

摘要

美国加州大学圣地亚哥分校的大型高性能室外振动台(LHPOST)于 2004 年 10 月 1 日投入使用,是美国国家科学基金会(NSF)地震工程模拟网络(NEES)项目的共享实验设施,在 2019 年 10 月至 2022 年 4 月期间由原来的一自由度(LHPOST)升级为六自由度配置(LHPOST6)。本文介绍了基于力学的 LHPOST6 数值模型,该模型能够捕捉升级后的六自由度振动台系统在裸台条件下的动力学特性。该模型包括(i) 刚体运动学模型,将压盘运动与连接到压盘上的组件的运动联系起来;(ii) 液压动态模型,根据所有第四级伺服阀阀芯位置计算液压致动器力;(iii) 压紧支柱模型,确定三个压紧支柱产生的下拉力、(iv) 用于表示振动台系统耗散力的 Bouc-Wen 模型,以及 (v) 借鉴机器人分析的刚体动态模型,用于控制压盘在来自压盘上各部件的力的作用下的平移和旋转运动。根据实验数据进行的广泛验证表明,三轴和六轴地震振动台试验的结果非常吻合。这个经过验证的模型可以与试验试样的有限元模型相结合,研究振动台系统与试样之间的相互作用,并通过离线控制器调整或高级控制算法开发,为提高运动跟踪性能提供了可能性。
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Dynamic model of the UC San Diego NHERI six-degree-of-freedom large high-performance outdoor shake table

The UC San Diego large high-performance outdoor shake table (LHPOST), which was commissioned on October 1, 2004 as a shared-use experimental facility of the National Science Foundation (NSF) Network for Earthquake Engineering Simulation (NEES) program, was upgraded from its original one degree-of-freedom (LHPOST) to a six-degree-of-freedom configuration (LHPOST6) between October 2019 and April 2022. A mechanics-based numerical model of the LHPOST6 able to capture the dynamics of the upgraded 6-DOF shake table system under bare table condition is presented in this paper. The model includes: (i) a rigid body kinematic model that relates the platen motion to the motions of the components attached to the platen, (ii) a hydraulic dynamic model that calculates the hydraulic actuator forces based on all fourth-stage servovalve spool positions, (iii) a hold-down strut model that determines the pull-down forces produced by the three hold-down struts, (iv) Bouc-Wen models utilized to represent the dissipative forces in the shake table system, and (v) a rigid body dynamic model borrowed from robotic analysis governing the translational and rotational motions of the platen subjected to the forces from the various components attached to the platen. Extensive validation against experimental data shows excellent agreement for tri-axial and six-axial earthquake shake table tests. This validated model can be coupled with finite element models of test specimens to study the interaction between the shake table system and the specimens, and it offers potential for enhancing motion tracking performance through off-line controller tuning or advanced control algorithm development.

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来源期刊
Earthquake Engineering & Structural Dynamics
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.
期刊最新文献
Issue information Issue information SSI-induced seismic earth pressures on an integral abutment bridge model: Experimental measurements versus numerical simulations and code provisions Estimation of inelastic displacement ratio spectrum for existing RC structures via displacement response spectrum Linear equivalence for motion amplification devices in earthquake engineering
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