Seismic interactions between adjacent and crossing bridges on deep foundations in nonlinear soil

Alfach, Mohanad Talal; Helwani, Amjad Al

doi:10.1080/17486025.2019.1648883

Cited by 5 publications

(6 citation statements)

References 11 publications

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“…Hence, the interaction between three dissimilar bridges (SSSI) has valuable positive impacts on the superstructure acceleration and the piles internal forces by provoking a signi cant diminution of both. Table 7 and Figures 12, 13, 14, and 15 demonstrate the slight in uence of the inter-bridge spacing on the internal forces provoked in the piles of the three bridges, which are in accord with the results of Alfach and Al Helwani (2019) and the results of Alfach (2021) about the minor impact of the inter-bridge spacing. Substantially, the bending moment and the shear force induced in the piles of the light bridge (M st = 350 T) increase by (up to 6 % and 6.9 %) respectively with the rise of the inter-bridge spacing.…”

Section: Resultssupporting

confidence: 84%

“…-The inter-bridge spacings have slight effect on the superstructure acceleration by reduction of the closest spacing (up to 6.9 %). Similarly, the bending moment and the shear force decline by (up to 10.47 %) and (up to 14.38 %) respectively, which agrees with the conclusions obtained by Alfach and Al Helwani (2019) for the effect of inter-bridge spacing between two identical bridges of (M st = 350 T).…”

Section: Discussionsupporting

confidence: 89%

“…-Intriguingly, the results revealed substantial bene cial effects of (SSSI) between the three dissimilar bridges on both superstructure acceleration and the internal forces induced in the piles, particularly for the case of neighbouring superstructures lumped masses ratio of (300 %). Differently, the (SSSI) effects between two identical bridges (M st = 350 T) has modest effect (rather positive) on the seismic response of the two bridges and the internal forces induced in the piles, according to the results of Alfach and Al Helwani (2019).…”

Section: Discussionmentioning

confidence: 91%

“…Notably, the contents of this study focused on the effect of inter-bridge spacing and dissimilar bridge geometrical arrangements on the (SSSI) impact. In this paper, we enlarge the range of our former studies about the (SSSI) effect between two identical bridges in Alfach and Al Helwani (2019), and the (SSSI) effect between two dissimilar bridges in Alfach (2021) to study the case of three dissimilar bridges with different superstructure mass ratios. The numerical analyses were performed using a nite-difference modeling software FLAC 3D (Fast Lagrangian analysis of continua in 3 dimensions).…”

Section: Aimsmentioning

confidence: 99%

“…The building models were printed with brittle material behaviour similar to masonry and tested in a geotechnical centrifuge. A thorough series of numerical analyses have been conducted by Alfach and Al Helwani (2019) to examine the effect of the plan positioning of the bridges towards the seismic excitation direction and inter-bridge spacing for two identical bridges supported by a group of piles embedded in nonlinear clay. Knappett et al (2015) have examined the seismic performance of an isolated structure and adjacent (similar and dissimilar) structures under a series of strong seismic excitations.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Structure-Soil-Structure Interaction (SSSI) between Three Dissimilar Adjacent Bridges

Alfach

Ayoub

2021

Preprint

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The present study assesses the effect of Structure-Soil-Structure-Interaction (SSSI) on the seismic behavior of three dissimilar adjacent bridges by comparing their seismic responses with the seismic response of the isolated bridge including Soil-Structure-Interaction (SSI). To this end, an extensive series of numerical analyses have been carried out to elicit the effects of Structure-Soil-Structure-Interaction (SSSI) on the seismic behavior of three dissimilar bridges with different superstructure masses. The studied bridges are based on groups of piles founded in nonlinear clay. A parametric study has been performed for configurations of three dissimilar bridges with superstructure masses ratios of 200% and 300%, concentrating on the influence of the inter-bridge spacing, and the geometrical position of the bridges towards each other and towards the seismic excitation direction. The numerical analyses have been conducted using a three-dimensional finite difference modeling software FLAC 3D (Fast Lagrangian analysis of continua in 3 dimensions). The results of the numerical simulations clearly show that the seismic responses of the dissimilar grouped bridges were strongly influenced by the neighboring bridges. In particular, the results reveal a salient positive impact on the acceleration of the superstructure by a considerable drop (up to 90.63%) and by (up to 91.27%) for the internal forces induced in the piles. Comparably, the influence of bridge arrangement towards the seismic loading were prominent on both of superstructure acceleration and the internal forces in the piles. The responses were as much as 27 times lesser for the acceleration and 11 times smaller for the internal forces than the response of the isolated bridge. Contrarily, the inter-bridge spacing has a limited effect on the seismic response of the grouped bridges.

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Section: Resultssupporting

confidence: 84%

Section: Discussionsupporting

confidence: 89%

Section: Discussionmentioning

confidence: 91%

Section: Aimsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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