Unexpected soil amplification effect on seismic performance of highway bridges during the Aegean earthquake of October 2020, Mw 6.6

Pub Date : 2021-12-09 DOI:10.3233/brs-210190
Gamze Muratoğlu, Berk Karakuş, A. Caner, Havin Arslan, Nurettin Pelen, Uzay Genişoğlu, B. Atak
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Abstract

On October 30, 2020, an earthquake about 70 km away from the city center of Izmir with a 4.3 million population has shaken the city tremendously and has resulted in destruction of many building type of structures due to an unexpected high soil-amplified vibrations very similar to the Mexico City earthquake in 1985. The bridges at the soil-amplified sites has performed in elastic range with no damage at all. In the city of Izmir, the 42 year old twin bridges located on the main transportation route, were tremendously shaken by the earthquake had observed to have no seismic induced damage. Surprisingly twin bridges suffering from the alkali silica reaction (ASR) over the years did not even pound to each other despite the small size of longitudinal gap between them. As it has been known, the past performance of Turkish designed bridges are typically succesfull with almost no damage as observed in the Van 2011 and Sivrice 2020 earthquake mainly due to allowing movements at their joints and to flexible type of framing. The focus of the paper is given to understand the successful performance of bridges and to investigate the non-pounded twin bridges of the Izmir city. In this scope, a bridge inspection has been performed and the twin bridges have been analyzed for the recorded ground motion. The results have indicated that the structures have been subjected to 0.3 g at their vibration modes and the twin bridges have a synchronized motion due to having the identical vibration mode shape with a period of 1.5 seconds
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2020年10月爱琴海地震期间,意外的土壤放大对公路桥梁抗震性能的影响,Mw 6.6
2020年10月30日,在距离拥有430万人口的伊兹密尔市中心约70公里的地方发生了一场地震,由于与1985年墨西哥城地震非常相似的意外高土壤放大振动,这场地震极大地震动了这座城市,并导致许多建筑类型的结构被毁。土壤放大场地的桥梁在弹性范围内运行,没有任何损坏。在伊兹密尔市,位于主要交通路线上的这座有42年历史的双桥在地震中受到了巨大的震动,据观察,没有地震造成的损坏。令人惊讶的是,多年来遭受碱硅反应(ASR)的双桥甚至没有相互撞击,尽管它们之间的纵向间隙很小。众所周知,土耳其设计的桥梁过去的性能通常是成功的,几乎没有损坏,正如在2011年Van和2020年Sivrice地震中观察到的那样,这主要是由于允许其接缝处的移动和灵活的框架类型。本文的重点是了解桥梁的成功性能,并研究伊兹密尔市的非捣固双桥。在此范围内,对桥梁进行了检查,并对双桥进行了地面运动记录分析。结果表明,结构受到了0.3 g,并且由于具有周期为1.5秒的相同振动模式形状,双桥具有同步运动
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