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首页> 外文期刊>Journal of Performance of Constructed Facilities >Vibration Characteristics of Komurhan Highway Bridge Constructed with Balanced Cantilever Method
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Vibration Characteristics of Komurhan Highway Bridge Constructed with Balanced Cantilever Method

机译：平衡悬臂法兴建的库莫尔汉公路桥梁的振动特性

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摘要

Komiirhan Highway Bridge is a reinforced concrete box girder bridge located on the 51 st km of Elazig-Malatya Highway over the Firat River. Because of the fact that the Komiirhan Bridge is the only bridge in this part of Firat, it has major logistical importance. So, this paper aims to determine dynamic characteristics such as natural frequencies, mode shapes, and damping ratios of the bridge using experimental measurements and finite-element analyses to evaluate current behavior. The experimental measurements are carried out by ambient vibration tests under traffic loads. Due to the expansion joint in the middle of the bridge, special measurement points are selected and experimental test setups are constituted. Vibration data are gathered from the both box girder and bridge deck. Measurement time, frequency span, and effective mode number are determined by considering similar studies and literature. The peak picking method in the frequency domain is used for the output-only modal identification. An analytical modal analysis is performed on the developed two- and three-dimensional finite-element model of the bridge using SAP2000 software to provide the analytical frequencies and mode shapes. At the end of the study, dynamic characteristics of the Elazig and Malatya parts of the bridge obtained from the experimental measurements are compared with each other and transverse effects on the bridge are determined. Also, experimental and analytical dynamic characteristics are compared. Good agreement is found between dynamic characteristics in the all measurement test setups performed on the box girder and bridge deck and analytical modal analyses.
机译：Komiirhan公路桥是一座钢筋混凝土箱梁桥，位于菲拉特河上方Elazig-Malatya公路51公里处。由于科米米尔汗桥是菲拉特这一部分的唯一桥梁，因此在后勤方面具有重要意义。因此，本文旨在通过实验测量和有限元分析来评估桥梁的动态特性，从而确定桥梁的固有频率，振型，阻尼比等动态特性。通过在交通负荷下的环境振动测试进行实验测量。由于桥梁中间有伸缩缝，因此需要选择特殊的测量点并构成实验测试装置。振动数据是从箱形梁和桥面甲板收集的。通过考虑类似的研究和文献来确定测量时间，频率跨度和有效模式号。频域中的峰值拾取方法用于仅输出模式识别。使用SAP2000软件对已开发的桥梁二维和三维有限元模型进行分析模态分析，以提供分析频率和振型。在研究结束时，将通过实验测量获得的桥梁Elazig和Malatya部分的动力特性相互比较，并确定对桥梁的横向影响。此外，比较了实验和分析的动态特性。在箱形梁和桥面板上进行的所有测量测试设置中的动力特性与分析模态分析之间都发现了很好的一致性。

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