ANALYTICAL STUDY ON DEVELOPMENT OF FRAGILITY CURVES USING A HYBRID PO-IDA APPROACH FOR SEISMIC VULNERABILITY ASSESSMENT OF MULTI-SPAN REINFORCED CONCRETE BRIDGES IN NEAR-FAULT EARTHQUAKE

Htay, Khin Thuzar (2024) ANALYTICAL STUDY ON DEVELOPMENT OF FRAGILITY CURVES USING A HYBRID PO-IDA APPROACH FOR SEISMIC VULNERABILITY ASSESSMENT OF MULTI-SPAN REINFORCED CONCRETE BRIDGES IN NEAR-FAULT EARTHQUAKE. S3 thesis, MDPI Buildings.

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Abstract

This dissertation investigates the seismic fragility of multi-span reinforced concrete (RC) bridges with hollow piers under near-fault earthquake conditions, emphasizing the development of a hybrid methodology for constructing fragility curves. The study integrates Nonlinear Static Pushover Analysis (POA) and Incremental Dynamic Analysis (IDA) to enhance computational efficiency while maintaining analytical accuracy. Four hybrid methods (HBM1 to HBM4) were evaluated, using spectral displacement and peak ground acceleration (PGA) as key parameters to assess bridge vulnerability across four damage states: slight, moderate, extensive, and collapsed. HBM1, combining IDA yield displacement with POA maximum displacement, demonstrated superior accuracy and practical applicability for fragility curve development using spectral displacement. HBM3, integrating IDA yield displacement with POA maximum displacement using PGA, emerged as the most practical method, given the availability of PGA data and its direct correlation with seismic intensity. These methods provided conservative and reliable predictions of damage probabilities, making them suitable for high-seismic regions like Aceh and Sagaing. HBM2 (IDA maximum displacement with POA yield displacement using spectral displacement) and HBM4 (IDA maximum displacement with POA yield displacement using PGA) were also analyzed. While HBM2 effectively captured damage progression at higher seismic intensities, it demonstrated reduced sensitivity to lower seismic demands and required higher computational resources for detailed dynamic analysis. HBM4, though straightforward in its use of PGA, showed less alignment with observed damage thresholds at moderate seismic intensities, potentially underestimating structural vulnerabilities in certain scenarios. These limitations informed the decision to prioritize HBM1 and HBM3. The results underscore the critical importance of selecting an appropriate hybrid method based on regional seismic characteristics, computational feasibility, and analytical requirements. The findings contribute to seismic vulnerability assessments by providing practical recommendations for fragility curve development, bridge retrofitting strategies, and seismic design. The hybrid methodology enhances resilience planning, particularly for regions prone to near-fault seismic activity, and offers a significant advancement in structural engineering practices. Keywords: Seismic Vulnerability, Reinforced Concrete Bridge, Fragility Curves, Incremental Dynamic Analysis (IDA), Hybrid Method (Po-ID)

Item Type:	Thesis (S3)
Supervisors:	Prof. Dr.Eng. Jafril Tanjung, M.T. Ir. Masrilayanti, M.Sc., Ph.D Prof. Monita Olivia, M.Sc.,Ph.D
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) T Technology > TG Bridge engineering
Divisions:	Fakultas Teknik > S3 Teknik Sipil
Depositing User:	s3 teknik sipil
Date Deposited:	22 Jan 2025 07:39
Last Modified:	22 Jan 2025 07:39
URI:	http://scholar.unand.ac.id/id/eprint/486614

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