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A platform for research: civil engineering, architecture and urbanism
Seismic performance of bridge piers: caisson vs pile foundations
Abstract This work investigates the role of foundation type and layout on the seismic response of a bridge pier. Reference is made to an Italian case study of a bridge pier to be founded on a well-characterized subsoil. Both a caisson and a 3×3 pile foundation are considered as suitable design options. For each foundation type, three different geometrical layouts satisfying Ultimate Limit State (ULS) checks are analysed. Equivalent-linear ground response analyses are preliminary performed to derive the mobilized soil stiffness and damping ratio. FE analyses of the complete soil-foundation-bridge pier model are then carried out. Results indicate that consideration of Soil-Structure Interaction effects strongly reduces the pier acceleration, especially for pile foundations, which allow for a higher dissipation of energy due to radiation damping. Further, the role of foundation type and layout is discussed by separating the kinematic and inertial components of interaction, with reference to both frequency and time domain response. Some considerations about possible simplifying assumptions to account for these effects in routine engineering are finally reported.
Highlights The role of SSI on the seismic performance of a case study bridge pier is investigated. Different layouts of caisson and pile foundations are considered. The role of foundations on the kinematic and inertial interaction is elucidated. Results in both frequency and time domain are reported. Considerations for a simplified, practice-oriented design are provided.
Seismic performance of bridge piers: caisson vs pile foundations
Abstract This work investigates the role of foundation type and layout on the seismic response of a bridge pier. Reference is made to an Italian case study of a bridge pier to be founded on a well-characterized subsoil. Both a caisson and a 3×3 pile foundation are considered as suitable design options. For each foundation type, three different geometrical layouts satisfying Ultimate Limit State (ULS) checks are analysed. Equivalent-linear ground response analyses are preliminary performed to derive the mobilized soil stiffness and damping ratio. FE analyses of the complete soil-foundation-bridge pier model are then carried out. Results indicate that consideration of Soil-Structure Interaction effects strongly reduces the pier acceleration, especially for pile foundations, which allow for a higher dissipation of energy due to radiation damping. Further, the role of foundation type and layout is discussed by separating the kinematic and inertial components of interaction, with reference to both frequency and time domain response. Some considerations about possible simplifying assumptions to account for these effects in routine engineering are finally reported.
Highlights The role of SSI on the seismic performance of a case study bridge pier is investigated. Different layouts of caisson and pile foundations are considered. The role of foundations on the kinematic and inertial interaction is elucidated. Results in both frequency and time domain are reported. Considerations for a simplified, practice-oriented design are provided.
Seismic performance of bridge piers: caisson vs pile foundations
Conti, Riccardo (author) / Di Laora, Raffaele (author) / Licata, Valeria (author) / Iovino, Maria (author) / de Sanctis, Luca (author)
2019-11-21
Article (Journal)
Electronic Resource
English
Towards a seismic capacity design of caisson foundations supporting bridge piers
| Online Contents | 2014
CAISSON FOUNDATIONS FOR BRIDGE PIERS IN LOUISIANA WATERWAYS
| British Library Conference Proceedings | 1999
Engineering Index Backfile | 1945