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Condition Assessment of an Aging PSC Bridge in Karachi

With many of the Karachi bridges that are built before the adoption of modern philosophies of design, are structurally deficient and degraded, owing to the ageing effects and non-existent maintenance. In most cases, these bridges as they approach their service lifetime are now carrying much higher volume and heavier loaded freight vehicles, which warrants continuous assessment of their safety to increased operational loads and seismicity, before deciding on their optimal management.A pre-stressed concrete bridge (PSC) located in Karachi is investigated for structural deficiencies and possible weakening based on a three-tier approach, including Non-Destructive Evaluation (NDE) and seismic evaluation. The study results show that the overall behaviour of the bridge structure has adequate strength to meet the West Pakistan Highway Code (WPHC) [1] and American Association of State Highway and Transportation Officials (AASHTO) 2006 [2] code demands.