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A novel mitigation measure for normal fault-induced deformations on pile-raft systems

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Abstract

Evidence from recent earthquakes has shown destructive consequences of fault-induced permanent ground movement on structures. Such observations have increased the demand for improvements in the design of structures that are dramatically vulnerable to surface fault ruptures. In this study a novel connection between the raft and the piles is proposed to mitigate the hazards associated with a normal fault on pile-raft systems by means of 3D finite element (FE) modeling. Before embarking on the parametric study, the strain-softening constitutive law used for numerical modeling of the sand has been validated against centrifuge test results. The exact location of the fix-head and unconnected pile-raft systems relative to the outcropping fault rupture in the free-field is parametrically investigated, revealing different failure mechanisms. The performance of the proposed connection for protecting the pile-raft system against normal fault-induced deformations is assessed by comparing the geotechnical and structural responses of both types of foundation. The results indicate that the pocket connection can relatively reduce the cap rotation and horizontal and vertical displacements of the raft in most scenarios. The proposed connection decreases the bending moment response of the piles to their bending moment capacity, verging on a fault offset of 0.6 m at bedrock.

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Acknowledgment

The authors would like to acknowledge the financial support provided by Babol Noshirvani University of Technology under Grant No. P/M/1102.

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Authors and Affiliations

  1. Faculty of Civil Engineering, Babol Noshirvani University of Technology, Shariati Ave., Mazandaran, Babol, Iran

    Mohammadreza Jahanshahi Nowkandeh & Mehdi Ashtiani

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  1. Mohammadreza Jahanshahi Nowkandeh
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  2. Mehdi Ashtiani
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Correspondence to Mehdi Ashtiani.

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Supported by: Babol Noshirvani University of Technology under Grant No. P/M/1102

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Nowkandeh, M.J., Ashtiani, M. A novel mitigation measure for normal fault-induced deformations on pile-raft systems. Earthq. Eng. Eng. Vib. 23, 15–33 (2024). https://doi.org/10.1007/s11803-024-2225-0

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