Seismic Analysis and Design of Retaining Walls, Buried Structures, Slopes, and Embankments (2008) / Chapter Skim
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Pages 10-17
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From page 10... ...
10 The goal of Task 1 of the NCHRP 12-70 Project was to collect, review, and interpret relevant practice, performance data, research findings, and other information needed to establish a starting point for subsequent phases of the Project. The work performed within this task included review of the current status the NCHRP 20-07 Project; literature searches; and contacts with individuals involved in the seismic design of retaining walls, slopes and embankments, and buried structures.
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From page 11... ...
The relevant analysis requirements included typical levels of ground shaking and spectral shapes for WUS and CEUS, which then defined the demand requirements for completing the design of retaining walls, slopes and embankments, and buried structures. While the preliminary decision on return period addressed one critical design need for the NCHRP 12-70 Project, the following additional changes regarding the earthquake design basis also needed to be considered by the NCHRP 12-70 Project or at least be coordinated with future work being done to implement the NCHRP 20-07 Project recommendations: • The shape of the spectrum to be used for design.
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K "A Unified Procedure for Earth Pressure Calculations." In Proceedings of the 3rd International Conference on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics, St.
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"Geotechnical Earthquake Engineering, Reference Manual." Federal Highway Administration, National Highway Institute, 1998. – Rogers, J
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D "An Overview of Geotechnical and Lifeline Earthquake Engineering." Geotechnical Special Publication No.
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• Retaining Walls – M-O equations are used almost exclusively to estimate seismic active and passive earth pressure. Little attention seems to be given to the assumptions inherent to the use of the M-O equations.
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WSDOT found that if no resistance factors were applied to the dynamic case, as suggested in NCHRP 12-49 Project report and other similar documents, it was possible that the seismic earth pressure will be lower than the static earth pressure determined using load and resistance factors in the AASHTO LRFD Bridge Design Specifications. WSDOT also provided a preliminary copy of their draft seismic design requirements for retaining walls, slopes, and embankments.
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From page 17... ...
This was due in part to the lack of generally accepted design guidelines and the general costs associated with the implementation of additional design requirements. As a final note, it was commonly accepted by most practitioners involved in designing retaining walls and underground structures that earth structures have performed well in past earthquakes, even for the higher ground shaking levels in WUS.
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