ANALYSIS OF SOIL-FOUNDATION-STRUCTURE INTERACTION IN CONTINUOUS CONCRETE BRIDGE ON LIQUEFIED SOIL (CASE STUDY: PALU IV BRIDGE, CENTRAL SULAWESI PROVINCE)

• Main Author: Farid, Mifta
• Format: Theses
• Language: Indonesia
• Subjects: Teknik sipil
• Online Access: https://digilib.itb.ac.id/gdl/view/79609
• Institution: Institut Teknologi Bandung

One of the impacts caused by earthquakes is the phenomenon of soil loss capacity due to seismic vibrations or cyclic loads known as liquefaction events. Liquefaction events are triggered by the significant movement of sand layers during an earthquake, which can lead to damage to bridge structures. This study examines the design of Palu IV bridge, which has a main span of 116 m and two side spans each measuring 66.7 m with a continuous concrete bridge structure. The focus of this research is to check the performance level of the bridge due to the effects of liquefaction caused by an earthquake, considering the soil-structure interaction for the design of Palu IV bridge. Soil-structure interaction (SSI) is modeled using the P-Y Curve following the Non-Linear Winkler spring model developed by Dash and Bhattacharya (2017), taking into account the behavior of liquefied soil. The P-Y curve is obtained through iteration using the finite difference software FLAC3D. The bridge structure is evaluated using Non-linear Time History Analysis and further assessed against the performance level criteria for bridges according to the ASCE 41-17 document. The results of this study indicate that liquefaction causes an increase in bending moments and deflections in bridge structures, especially in the foundations within soil layers with liquefaction potential. The Non-linear Time History Analysis results show that the bridge's performance level criteria fall within the operational limits (Immediate Occupancy - Life Safety) due to the effects of liquefaction.