System Identification of UCSD-NHERI Shake-Table Test of Two-Story Structure with Cross-Laminated Timber Rocking Walls
System Identification of UCSD-NHERI Shake-Table Test of Two-Story Structure with Cross-Laminated Timber Rocking Walls
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DOI：
10.1061/(asce)st.1943-541x.0002938
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发表时间：
2021-04-01
影响因子：
4.1
通讯作者：
Berman, Jeffrey W.
中科院分区：
文献类型：
--
作者：
Mugabo, Ignace;Barbosa, Andre R.;Berman, Jeffrey W.
2017年6月至2017年9月期间，在加州圣地亚哥大学自然灾害工程研究基础设施（UCSD-NHERI）单轴振动台上对全尺寸2层质量木建筑进行了测试。该实验项目的主要目的是测试具有不同抗震抗侧力系统的大规模木结构建筑设计的性能。本研究的重点是一个建筑配置设计使用自定心后张交叉层压木材（CLT）摇摆墙与U形钢弯板耗能器。振动台试验的目的是使建筑物经受一系列强度不断增加的地震地面运动，范围从服务水平地震到最大考虑地震强度的1.20倍。在每个地面运动之间，低振幅白噪声激励施加到建筑物上，其响应为准线性系统。在本文中，两个输出只操作模态分析方法被用来估计模态参数（频率，阻尼，振型）的基础上收集的白噪声振动台试验期间的加速度数据。在实验过程中观察到的损坏和维修的相关性与估计的模态特征的变化进行了报告。从测试程序中估计的模态参数也比较了线性有限元模型，用于验证模态识别结果，并研究了两种系统识别方法的性能CLT摇摆结构。(C)2021年美国土木工程师学会
A full-scale 2-story mass timber building was tested on the University of California San Diego Natural Hazards Engineering Research Infrastructure (UCSD-NHERI) uniaxial shake table during the period from June 2017 to September 2017. The main objective of the experimental program was to test the performance of mass timber building designs with different seismic lateral force-resisting systems. The focus of this study is on a building configuration designed using self-centering post-tensioned cross-laminated timber (CLT) rocking walls with U-shaped steel flexural plate energy dissipators. The shake-table tests were designed to subject the building to a series of earthquake ground motions of increasing intensity, ranging from a service-level earthquake to 1.20 times the maximum considered earthquake intensity. Between each ground motion, low-amplitude white-noise excitations were applied to the building, which responded as a quasilinear system. In this paper, two output-only operational modal analysis methods are used to estimate the modal parameters (frequency, damping, and mode shapes) based on acceleration data collected during the white-noise shake-table tests. The correlations of observed damage and repairs performed during the experimental program with changes in estimated modal features are reported. The modal parameters estimated from the testing program are also compared with a linear finite-element model that is used to validate the modal identification results and study the performance of the two system identification methods for CLT rocking structures. (C) 2021 American Society of Civil Engineers.