Seismic Site Classification of JKR Bridge at Sungai Sepang Using Multichannel Analysis of Surface Wave (MASW)
In seismic engineering, the dynamic property of the soil is one of the most important aspects in ground response analysis. Dynamic property is significantly affected by local soil deposits. Shear wave velocity (V s) of soil is one of the main parameters i
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Abstract In seismic engineering, the dynamic property of the soil is one of the most important aspects in ground response analysis. Dynamic property is significantly affected by local soil deposits. Shear wave velocity (Vs) of soil is one of the main parameters in determining the amplification factor on ground surface. This study aims to determine the shear wave velocity profile of the bridge at Sungai Sepang by using multichannel analysis of surface wave (MASW) method. All the acquired raw data from the MASW field test were analyzed and it can be summarized to three major steps: First, filter the wiggle plot to the analyzable range of frequency of Rayleigh wave; second, develop the dispersion curves of Rayleigh wave phase velocity and; third, inversion of dispersion curve to obtain the Vs profiles. The filter and the development of dispersion curve processes were carried out by using Pickwin softwis (SeisImager/SW). Results show that the soil for bridge at Sungai Sepang is having a very low Vs30, which is 143.3 and 137.2 m/s, respectively. The soils are classified as Class E which can be considered soft soil according to Uniform Building Code (UBC). Based on the N-SPT value by using empirical formula, the value of Vs30 ranges from 101.22 to 151.87 m/s by using different empirical formula. It can be concluded that the value of Vs30 for bridge by using MASW is accepted since the value is near to the value of numerical equation from N-SPT value based on borehole data at Sungai Sepang site. R. Ismail (&) Institute for Infrastructure Engineering and Sustainable Management (IIESM), Faculty of Civil Engineering, UiTM, Shah Alam, Selangor, Malaysia e-mail: [email protected] A. Ibrahim H.A. Hamid Department of Structures and Material, Faculty of Civil Engineering, UiTM, Shah Alam, Selangor, Malaysia T.A. Majid Disaster Research Nexus, School of Civil Engineering, USM, Gelugor, Penang, Malaysia A. Adnan Department of Structures and Material, Faculty of Civil Engineering, UTM, Johor Bahru, Johor, Malaysia © Springer Science+Business Media Singapore 2016 M. Yusoff et al. (eds.), InCIEC 2015, DOI 10.1007/978-981-10-0155-0_16
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Keywords Shear wave velocity profile (MASW)
Multichannel analysis of surface wave
1 Introduction In seismic engineering, the most important aspect is to determine the dynamic properties of the subsurface geo-material structure. The dynamic soil properties significantly influence the seismic response and performance of the structure above such as fundamental period and seismic demand and capacity. However, lacking of understanding of the geological information of the site often resorted to structure and environmental failures. Shear wave velocity (Vs) has become one of the most important properties in seismic site characterization from which in situ dynamic shear modulus of soil is determined due to its direct relationship with shear modulus via the soil mass density as well as its relative ease of measurement [1, 2]. The dynamic shear modulus (Gmax) can be determined by the
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