CISOMANG BRIDGE’S JACKETING REINFORCEMENT ANALYSIS

• Main Author: PRAMUDITA KUNCORO , HENRY
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/22425
• Institution: Institut Teknologi Bandung

Bridge is a structure that helps joining two areas because the existence of geographical obstacles such as hills, valleys, or rivers. The Cisomang Bridge, located on Cipularang Highway, was built in 2005 to enhance the mobility between Bandung and Jakarta. On 2016, the pier of this bridge were cracked thus the bridge experiencing shifts up to 50 centimeters. The shifts caused by the accumulation of land movement because of the active Cisomang River. <br /> <br /> <br /> Reinforcement and repairing are crucial for the existence and utility of this bridge. The repairs, with the goal of stopping movement and improve pier’s capacity, diverse such as foundation’s reinforcement, pile cap reinforcement, Fiber Reinforced Polymer (FRP) installation on pier, and dimensional thickening of the pier itself. This report will evaluate and analyze the effect of bridge’s repairs, especially the pier’s dimensional thickening (jacketing) on enduring the earthquake load of existing plans. <br /> <br /> <br /> The method used to analyze the jacketing process starts with observing failure data on the field and making the structure’s model using MIDAS 2011 software. The model must be adjusted to the condition of the field, where column’s stiffness is decreased due to its damage. The adjustment of the stiffness conducted by analyzing the moment’s size of pier’s cross section using XTRACT 3.0.8 software. The thickness of model’s section must be modified so the moment’s values match, thus the thickness represents the stiffness on the field. <br /> <br /> <br /> By obtaining the effective value of section’s thickness, jacketing’s reinforcement modeling performed using data’s specification, which obviously results in stiffness’s increase. The report will next checking the ability of the reinforced section to endure some load combinations, especially earthquake load according to SNI 1725-2016 and SNI 2833-201X. The examination covers axial-bending test using Csi-Col software and shear-torque test using manual calculation regarding SNI T-12-2004. <br /> <br /> <br /> Based on the analysis performed, the shift reduces column’s stiffness at top and bottom value from 0.7 EI to 0.21 EI. This value can also be represented as decrease of section’s thickness from 400 mm to 90 mm. The jacketing reinforcement performed will be able to increase the pier’s stiffness at top and bottom to 0.44 EI and also increase the column’s capacity significantly, which can be seen on column’s interaction diagram. The jacketing modeling of Cisomang Bridge will help the bridge to endure earthquake load with less than 60% ratio and keep the existence shear-torque forces under control. <br />