Seismic performance and design of bridge foundations in liquefiable ground with a frozen crust.

Yang, Zhaohui; Zhang, Xiaoyu; Alaska University Transportation Center

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Seismic performance and design of bridge foundations in liquefiable ground with a frozen crust.

2012-12-01
By Yang, Zhaohui ; Zhang, Xiaoyu

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Details:

Creators:

Yang, Zhaohui ; Zhang, Xiaoyu

Yang, Zhaohui ; Zhang, Xiaoyu Less -
Corporate Creators:

Alaska University Transportation Center
Corporate Contributors:

United States. Federal Highway Administration
Subject/TRT Terms:

[+]

Bridge Design Bridge Foundations Earthquake Engineering Finite Element Method Frozen Soils Liquefaction Load Factor Permafrost Piles (Supports) Seismicity
Publication/ Report Number:

FHWA-AK-RD-12-19
Resource Type:

Tech Report
Geographical Coverage:

Alaska
Corporate Publisher:

Alaska. Dept. of Transportation and Public Facilities
NTL Classification:

NTL-ENERGY AND ENVIRONMENT-ENERGY AND ENVIRONMENT;NTL-HIGHWAY/ROAD TRANSPORTATION-Bridges and Structures;NTL-HIGHWAY/ROAD TRANSPORTATION-Design;
Abstract:

Two major earthquakes in Alaska, namely 1964 Great Alaskan earthquake and 2002 Denali earthquake, occurred in winter season when the ground crust was frozen. None of the then-existing foundation types was able to withstand the force from the frozen crust overlying liquefied soils. This project aims to study how the frozen ground crust affects the performance of bridge pile foundations and how one can estimate the loads imposed by the frozen ground crust. A shake table experiment was conducted to gain in-depth understanding of the mechanism of frozen ground crust-pile foundation interaction and collect data to validate a solid-fluid coupled finite element (FE) model and a simplified method, i.e. the beam-on-nonlinear-Winkler-foundation (BNWF) or p-y approach. Loads imposed on pile foundations by the frozen crust were studied through solid-fluid coupled FE analyses of a typical Alaskan bridge foundation under two soil conditions‒one with an unfrozen crust and the other with a frozen crust‒and by comparison of results obtained from these two cases. The effectiveness of the p-y approach in predicting the response of piles subject to frozen ground lateral spreading in liquefiable soils was evaluated by comparing the analyses of results with those obtained from the FE modeling. Finally, guidelines were proposed for design practitioners to analyze the performance of pile foundations embedded in liquefiable soils subject to frozen ground crust lateral spreading with the p-y approach.
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PDF
Collection(s):

University Transportation Centers US Transportation Collection
Main Document Checksum:

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urn:sha256:ad9ba5b7c0c3c8bbb4a587d2c1f0f15cc2c847825540b599e7053645dd5299b4
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https://rosap.ntl.bts.gov/view/dot/26091/dot_26091_DS1.pdf
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Seismic performance and design of bridge foundations in liquefiable ground with a frozen crust.

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