REINFORCEMENT ANALYSIS ON FIBER REINFORCED POLYMER (FRP) OF CISOMANG BRIDGE

• Main Author: AZHARI , YUNI
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/24825
• Institution: Institut Teknologi Bandung

Cisomang Bridge is a bridge located at Cipularang Toll Road in KM 100 + 695 to KM 100 + 947 with the length of 253,127 meters. The bridge is a Pre-stressed Concrete Girders (Simple Beam and Continuous Integral) bridge with six pillars and 30 - 33 meters depth bored pile foundation system. The Cisomang Bridge is cracked and drifted by ± 50 centimeters on the 2nd pillar (P2) of the six pillars supporting the portal bridge (beam integral bridges). This drift is due to the slow accumulation of ground motion where the foundation of the 1st and 2nd pillars rests on the soil of volcanic breccias and clay soil. The active Cisomang River stream and high rainfall also cause swelling in the soil, resulting in the slip of the pillars located on sliding angle. <br /> <br /> <br /> This final project will discuss about Cisomang Bridge analysis and bridge reinforcement in the form of Carbon Fiber Reinforced Polymer (CFRP) installed to avoid further damage to the bridge pillar. The analysis of the existing bridge condition will be done first to determine the effective stiffness of the Cisomang Bridge pillar due to the drift and crack that occurs to determine pillars’ forces to be used on bridge reinforcement calculations. The determination of the effective stiffness of the pillars is done by calibrating the moment obtained from the moment-curvature diagram of the pillar section to the pillar moment of the modeling of the bridge structure. Pillar’s curvature is calculated based on displacement on P2 pillars with the method proposed by Caltrans. Moment-cuvature diagram is achieved by considering plastic conditions and overstrength with the help of XTRACT software. <br /> <br /> <br /> Furthermore, a P-M interaction diagram of the FRP-reinforced pillar section will be developed to represent capacity combination of axial force and bending moment of the cross section. The calculation of P-M interaction diagram with fiber reinforced polymer (FRP) refers to ACI 440-2R.08 regulation. This P-M interaction diagram will be used to analyze the cross-sectional capacity of the pillar subjected to various load of the bridge in the form of dead load, predescribed displacement load, and live load. The increment in capacity of the axial bending combination of reinforced polymer (FRP) strengthening is 40-70% in the compression controlled zone and 0-5% in the tension controlled zone. Based on the result, the capacity ratio for axial bending combinations is 99.49%, 27.01% for shear forces, and <1% for torque. Thus, it can be concluded that the 500 mm lateral displacement on the P2 pillar and the live load caused by traffic load can still be borne by the bridge structure.