Development of risk-targeted seismic hazard maps for reinforced concrete deck girder bridges in the City of Manila
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ID: 285122
2024
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Abstract
Bridges are a significant part of road networks that continuously move supplies and people from one place to another. They are vulnerable to natural hazards like earthquakes that can cause a bridge to collapse in seconds. Seismic hazard maps are essential for designing and assessing a structure to withstand significant ground motion. The structural design and evaluation of structures are continuously updated based on the development of governing design codes and standards. The current uniform seismic hazard bridge design procedure can still be improved by incorporating the risk of a bridge collapse in a particular region. While risk-based seismic design for buildings is well-established and included in the design codes of several countries, its application in bridge performance-based seismic design is limited. Recent developments have seen the inclusion of risk-targeted ground motion concepts in the seismic design of bridges. However, these recent updates only partially cover the idea of a risk-targeted maximum-considered earthquake with a 1% probability of collapse in 50 years. In quantifying the uncertainties for risk design, this study applied incremental dynamic analysis (IDA) to produce the generic fragility curves of the reinforced concrete deck girder bridges in Manila. The IDA results determined that the record-to-record uncertainty equals 0.50, representing the RCDG bridge's collapse fragility lognormal standard deviation. The PSHA and DSHA were utilized to determine the seismic hazard at the site. Integrating the PSHA hazard curve with the collapse fragility curve using the iteration process determined the probabilistic risk-targeted ground motion (RTGM) following ASCE 7-16 procedures. The minimum of the probabilistic RTGM and deterministic ground motion obtained the risk-targeted maximum considered earthquake (MCER) values. The MCER maps were developed considering the directivity factors for the SS and S1 mapped spectral accelerations and the soil class types in Manila. These maps can produce an MCER response spectrum for designing new bridges and assessing existing ones.
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| Authors | Salazar, Randy B. |
| Journal | Malay Journal |
| Year | 2024 |
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