Earthquake analysis of reinorced concrete minarets using ambient vibration test results
Earthquake analysis of reinorced concrete minarets using ambient vibration test results
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使用环境振动测试结果进行钢筋混凝土尖塔的地震分析
DOI：
10.1002/tal.464
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发表时间：
2008
期刊：
影响因子：
--
通讯作者：
T. Türker
中科院分区：
文献类型：
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作者：
A. Bayraktar;B. Sevim;A. Altunışık;T. Türker
本文介绍了土耳其式钢筋混凝土宣礼塔的有限元模型、模态试验、有限元模型修正以及模型修正前后的抗震性能。位于土耳其特拉布宗的一座清真寺的尖塔被选为申请。利用有限元程序对尖塔进行了三维模型和振型分析，得到了分析频率和振型。对尖塔进行了在风和人体运动等自然激励下的环境振动试验。利用改进的频域分解和随机子空间辨识方法，在运行的模态分析软件中进行了只有输出的模态参数识别，确定了结构的动力特性(固有频率、振型和阻尼比)。通过改变一些不确定的建模参数，如材料特性和边界条件，更新了尖塔的三维有限元模型，以最小化分析和实验模态特性之间的差异。利用1992年额尔津坎地震，研究了尖塔在有限元模型修正前后的抗震性能。固有频率的最大差异从21%减小到8%，分析和实验固有频率之间有很好的一致性。此外，还认识到有限元模型修正对尖塔抗震性能的影响是有效的。版权所有©2008 John Wiley&Sons，Ltd.
This paper describes a Turkish style reinforced concrete minaret, its finite element model, modal testing, finite element model updating and earthquake behaviour, before and after model updating. The minaret of a mosque located in Trabzon, Turkey is selected as an application. A three‐dimensional (3D) model of the minaret and its modal analysis is performed to obtain analytical frequencies and mode shapes using ANSYS finite element program. The ambient vibration tests are conducted on the minaret under natural excitations such as wind effects and human movement. The output‐only modal parameter identification is carried out by Enhanced Frequency Domain Decomposition and Stochastic Subspace Identification methods in Operational Modal Analysis software and in doing so, dynamic characteristics (natural frequencies, mode shapes and damping ratios) are determined. A 3D finite element model of the minaret is updated to minimize the differences between analytical and experimental modal properties by changing some uncertain modelling parameters such as material properties and boundary conditions. The earthquake behaviour of the minaret is investigated using 1992 Erzincan earthquake before and after finite element model updating. Maximum differences in the natural frequencies are reduced from 21% to 8%, and good agreement is found between analytical and experimental natural frequencies. In addition to this, it is realized that finite element model updating is effective on the earthquake behaviour of the minaret. Copyright © 2008 John Wiley & Sons, Ltd.