Seismic design is paramount for ensuring the structural stability and safety of viaduct structures during earthquakes. The study aims to develop an efficient seismic design approach, assess the repairability of plastic hinges, account for combined seismic forces, and design appropriate reinforcements for flexural and shear strength. The paper delineates the seismic design process, encompassing displacement-based design and capacity checks in compliance with pertinent standards and guidelines. It discusses the selection and application of ground motion records, considering various return periods and directions to represent seismic events accurately. The study addresses plastic hinge repairability through displacement-based criteria, evaluating pier yielding and establishing maximum strain limits for reinforcement and concrete cover. Simultaneous application of earthquake forces in all directions is considered to account for orthogonal seismic effects. Design criteria for three viaducts (V1, V6, and V8) are presented, accompanied by detailed methodologies for flexural and shear reinforcement design. Flexural reinforcement design focuses on longitudinal reinforcement, employing strength-based design methods and adhering to reinforcement ratio specifications outlined in design codes. Shear reinforcement design encompasses areas outside and within the plastic hinge zone, incorporating provisions specified by design codes. The study's findings demonstrate the efficacy of the proposed seismic design strategy in ensuring the structural integrity of viaduct structures. Recommendations for future research and improvements in viaduct design are provided. Overall, the results contribute significantly to bolstering the seismic resilience of viaduct structures and enhancing the safety of transportation infrastructure in earthquake-prone regions. ORCID NO: 0000-0002-6383-1376
Anahtar Kelimeler: Seismic design, Viaduct structures, Plastic hinges, Orthogonal seismic effects, Flexural reinforcement, Shear reinforcement
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