EVALUATION OF LEMAH IRENG II BRIDGE PERFORMANCE IN SEMARANG-BAWEN TOLL SECTION BASED ON SNI 1725:2016 AND SNI 2833:2016

• Main Author: Amrina, Farah
• Format: Theses
• Language: Indonesia
• Subjects: Teknik sipil
• Online Access: https://digilib.itb.ac.id/gdl/view/80916
• Institution: Institut Teknologi Bandung

Indonesia is located at the confluence of four earth plates causing high intensity of earthquakes, so it is necessary to pay attention to the effect of the earthquake on building structures including bridges. Lemah Ireng II Bridge is box girder balance cantilever bridge located in Semarang Regency, Central Java, which was completed in 2014. The bridge was planned based on RSNI T-02-2005 for bridge loading regulations and SNI 2833:2008 for bridge earthquake loading regulations. The renewal of bridge loading regulations in 2016 consisted of SNI 1725:2016 for standard load and SNI 2833:2016 for earthquake load. Changes in earthquake loading regulations resulted in an increase in the ground surface spectra value in the short period (Sds, T=0,2 second) in the longitudinal direction of the bridge by 38.47% and in the transverse direction of the bridge by 45.39% as a result of updating the earthquake map and the earthquake response modification factor. In addition to the earthquake load, the "D" lane load increased by 17.29%. To determine the behavior of the structure against the applicable regulations, force based evaluation of the structure is carried out. Furthermore, an analysis of the performance level of the bridge based on the parameters on the pier was carried out using the Non Linear Time History Analysis (NLTHA) method. The NLTHA method uses seven deaggregated ground motion records which aim to represent the ground motions that occur at the bridge location. Parameter limits on piers are determined based on NCHRP Synthesis 440 for pier drift parameters, NCHRP Research Report 949 for concrete compressive strain and steel reinforcement tensile strain parameters, and ASCE 41-17 for pier rotation parameters. The results of the force-based analysis meet the requirements for both the girders and the pier. The girder parameters reviewed include deflection, compressive and tensile stress in service conditions, bending resistance and shear resistance of the girder, while the parameters on the pier being reviewed are the cross-sectional capacity and shear resistance of the pier that meet the requirements. According to the results of performance-based analysis, the bridge pier structure meets the Fully Operational performance level based on the parameters of drift, compressive strain of concrete and tensile strain of steel reinforcement. So that it meets the performance level requirements for bridges in the essential operational category. Meanwhile, based on the pier rotation parameters, the level of performance of the bridge structure is Life Safety at Upper Level Ground Motion and Immediate Occupancy at Lower Level Ground Motion so that it meets the requirements for the operational category of type IV structures (essential buildings).