Microtremor analysis to test the durability of Jumoyo Bridge, Central Java

作     者：Arga Brahmantyo Muhammad Ragil Setiawan Wahyudi 

作者机构：1Universitas Gadjah Mada Post-Graduate Program of Physics (Geophysics) Indonesia 2Universitas Gadjah Mada Lecture Indonesia 

出 版 物：《AIP Conference Proceedings》 

年 卷 期：2016年第1708卷第1期

学科分类：07[理学] 0702[理学-物理学] 

摘      要：Jumoyo Bridge is one of bridges connecting the main highways of Magelang-Yogyakarta, Indonesia. The bridge durability test was conducted to determine self-frequency and motion direction of the bridge’s particles. Measurements were performed in two circumstances, namely when the location was crowded and deserted to be passed by vehicles. Measurements points consisted of six points along Jumoyo Bridge, and one point above the ground level near the bridge. Obtaining the movement of particles and HVSR spectrum, the data analysis was conducted by using Geopsy software. The self-frequency values of the bridge were calculated based on HVSR spectrum. The process of selecting signal (windowing) was performed manually on the ambient signals. The self-frequency values of the bridge obtained were in the range of 2.74 to 2.95 Hz, with the amplitude were 0.48 to 1.63 mm. The bridge’s particle motion in vertical direction have trending N-S, while in horizontal direction tends to SW-NE. The ground’s frequency value around the bridge was 0.79 Hz. Based on these results, it can be said that Jumoyo Bridge has resistance towards the resonance danger of the ground. For the next measurement, it needs to measure the stresses that occur to obtain more complete analysis.