《Journal of Performance of Constructed Facilities 》杂志刊登“利用环境振动试验获得伯克拱坝的地震特性”

作  者：Barış Sevim,Ahmet Can Altunişik,Alemdar Bayraktar

刊  物：《Journal of Performance of Constructed Facilities》， 26卷第6期，780-792页

关键词：环境振动测试；伯克拱坝的动力特性；抗震性能；有限元建模

摘  要：伯克拱坝是土耳其最高的拱坝，坝高201m，坝肩长度为270m。本文介绍了伯克拱坝的有限元模型、环境振动试验、有限元模型的改进、改进前后的抗震性能。首先，通过ANSYS有限元程序建立了坝-水库-地基相互作用的三维模型，获得其固有频率和模态等分析动力特性。有限元分析中，水库中的水用拉格朗日方法表示。然后，于2009年5月4日通过环境振动试验获得了试验动态特性。在环境振动测试中，灵敏的加速度传感器被放置在拱坝的几个位置上，然后从加速度传感器上采集信号。并利用增强的频域分解技术获取试验的固有频率、振型和阻尼比。随后，利用环境振动试验结果来修正伯克拱坝的三维有限元模型。最后，利用1998年Adana-Ceyhan的地震来获得伯克拱坝的初始和修正模型的地震特性。

Earthquake Behavior of Berke Arch Dam Using Ambient Vibration Test Results

Authors: Barış Sevim,Ahmet Can Altunişik,Alemdar Bayraktar

Journal: Journal of Performance of Constructed Facilities,Volume 26,Issue 6 (December 2012),780-792

Key words: Ambient vibration testing, Berke Arch Dam Dynamic characteristics, Earthquake behavior, Finite-element modeling

Abstract: The Berke Arch Dam is the highest arch dam constructed in Turkey. The dam height is 201 m, and the crest length is 270 m. This paper describes the Berke Arch Dam, its finite-element modeling, ambient vibration testing, finite-element model calibration, and earthquake behavior before and after model calibration. First, three-dimensional (3D) models of dam-reservoir-foundation interaction were developed to obtain analytical dynamic characteristics, such as natural frequencies and mode shapes using the Ansys finite-element program. In the analyses, reservoir water was represented by a Lagrangian approach. Then, ambient vibration tests were conducted on the dam on 4 days in May 2009 to obtain experimental dynamic characteristics. In ambient vibration tests, the sensitive accelerometers were placed on several points on the arch dam, and signals were collected from accelerometers. The enhanced frequency domain decomposition technique was used in the extraction of experimental natural frequencies, mode shapes, and damping ratios. After that, 3D finite-element models of the Berke Arch Dam were calibrated using ambient vibration test results. Finally, earthquake behaviors of initial and calibrated models of the Berke Arch Dam were obtained using the Adana-Ceyhan Earthquake in 1998. It was observed that model calibration affects the results considerably.
原文链接：http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29CF.1943-5509.0000264