Probability Assessment of the Seismic Risk of Highway Bridges with Various Structural Systems (Case Study: Tehran City)

Considering the development of urban transportation systems and importance highway bridges in a city’s resilience against earthquakes, it is critical to pay special attention seismic risk evaluation bridges. The most significant issue consider assessment possible direct indirect damages imposed on before an earthquake. After this, best practices for bridge rehabilitation can be adopted minimize induced damage. In this paper, we assessed risks associated with all 713 Tehran province (the capital Iran). These were initially divided into six categories according their structural system construction year also classified by whether or not design was included. Among 84,000 earthquakes recommended researchers’ ten-thousand-year catalog, set 50 ground motion records selected course probabilistic approach via Optimization-based Probabilistic Scenarios (OPS) algorithm attempt obtain least amount error compared original catalog final hazard curve different regions province. Afterward, fragility curves plotted four damage states slight, moderate, extensive, complete simple, steel, concrete slab box, slab–steel slab, steel girder–concrete slab. results extracted from decision tree analysis validated those developed incremental dynamic (IDA) case study modeled OpenSEES software V2.5.0. Later, using logical relationships, drawn each system. show that, general, average over ten years old 0.88 times less than old. highest level vulnerability simple median 0.44. Moreover, lowest related 0.98, showing increase approximately 2.2 vulnerability. addition, based sensitivity results, total levels almost exponentially increasing reconstruction index.