Damage State Assessment of a Pre-Stress Concrete Girder (PSCG) Bridge using Non Linear Analysis for Real-time Structural Health Monitoring

Abstract

Philippines is located in the pacific ring of fire, which indicates that seismic movement is frequently happening. West valley fault line located in the central Luzon might move due to its 400 to 500-year recurrence, and the last recorded movement was on 1958. According to MMIERS, the movement of west valley fault with 7.2 magnitude earthquake can cause one of the biggest devastation in Metro Manila. In preparation for that, this study aims to assess the vulnerability of a pre-stress bridge against seismic movement by the aid of USHER technology. The USHER system includes structural assessment, remote sensing, and real time monitoring through the portal. This study will focus on the structural assessment of the bridge, which identify the acceleration limits that the bridge can endure to interpret different level of damage. As a result, by 10% of probability of exceedance from SEAOC using the moderate damage fragility curve, the results in three directions are 0.37641g in longitudinal axis, 0.366025g in transverse axis, and 0.394498g in the vertical direction. The most critical is in the transverse direction, which can produce a maximum of 67mm displacement of the bridge in the inelastic stage. In validation through the sensor, which has a reading from the smart bridge project, the maximum acceleration recorded was 0.138g. This concludes that the bridge is safe and no retrofitting works is need.