Dynamic behavior of soil-foundation-structure systems subjected to scour

Field tests and numerical analysis of the effects of scour on a full-scale soil–foundation–structural system

“…5 i Excavation of the soil under the foundation, ii scour hole shape at the end of the final test built in the Finite Element code Abaqus [47], namely, the Fixed Base (FB) structure, the structure with a continuous semi-infinite soil domain (SFS_1), and the structure with the SFS modelled using linear springs and dashpots (SFS_2), which simulate the impedance functions. A simplified version of the SFS_2 model is also developed in Matlab [48], by employing a substructure approach and exploiting the impedance functions derived in a previous work by some of the authors [49] using a two-dimensional soil model (SFS_3).…”

“…This approach can be employed for a preliminary assessment of the effects of scour in terms of change of modal properties. The approach is based on the work of Antonopoulos et al [49], where the influence of scour on the dynamic response of SFS systems was investigated by applying the substructure method [53]. In particular, non-dimensional frequency dependent impedance functions were obtained for a rigid strip foundation resting on an homogenous elastic soil domain for the case of no scour and for various scour hole shapes.…”

“…The numerical model used to derive the impedance function was developed in Abaqus [47] using a plain-strain assumption, and it was validated based on the comparison between the impedance functions obtained numerically and the ones reported in Hryniewicz [54]. Figure 10 illustrates the shape of the scour hole considered in Antonopoulos et al [49]. The derived impedance functions were used to evaluate the reduction of the fundamental vibration frequency of vibration of a simple SFS system (Fig.…”

An Analysis of Local and Combined (Global) Scours on Piers-on-Bank Bridges

“…Several studies have been conducted to study the effect of scour on the performance of bridge substructure and superstructures: Avent and Alawady [7] and Lin et al [8] studied the effects of scour on the buckling capacity of a bridge pier; McConnell and Cann [9] investigated scour effects on the pushover behavior of a bridge; Klinga et al [10] conducted buckling, longitudinal and transverse pushover analyses, and modal analyses of a scoured bridge; and Alipour et al [11] considered earthquake and scour scenarios to determine the probability of bridge failure under extreme conditions. Antonopoulos et al [12] studied the dynamic response of bridges with shallow foundations under scour and earthquake conditions.…”

“…In the literatures, most researchers would differentiate between the impacts of scour on the lateral behavior of piles as either cohesive or non-cohesive soil cases [8,12,13]. This is because scour hole formation (mass losses surrounding a bridge pier) in cohesionless soil can attain maximum depth within a few days, whereas, in cohesive soils, this process can take months or even years.…”