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|Title:||Permanent seismically induced displacement of rock-founded structures computed by the Newmark Program|
|Authors:||Science Applications International Corporation.|
Geotechnical and Structures Laboratory (U.S.)
Flood and Coastal Storm Damage Reduction Research and Development Program (U.S.)
Ebeling, Robert M., 1954-
Fong, Moira T.
Yule, Donald E.
Kala, Raju V.
Maximum transmissible acceleration
Newmark sliding block analysis
Rock earthquake ground motions
Earthquake resistant design
|Publisher:||Information Technology Laboratory (U.S.)|
Engineer Research and Development Center (U.S.)
|Series/Report no.:||ERDC TR ; 09-2.|
Abstract: This research report describes the engineering formulation and corresponding software developed for the translational response of rock-founded structural systems to earthquake ground motions. The PC software Newmark (and Newmark𝚟𝚖) is developed to perform an analysis of the permanent sliding displacement response for a structural system founded on rock for a user specified earthquake acceleration time history via a Complete Time History Analysis, also know as the Newmark sliding block method of analysis. The PC-based program Newmark performs a permanent sliding block displacement analysis given a baseline corrected rock site-specific acceleration time history. Newmark can also conduct regression analyses for sets of rock founded acceleration time histories in order to develop up to three user selected forms of generalized equations of simplified permanent displacement relationships. The rock-founded structural system can be a variety of structural feature types; a concrete gravity dam, a concrete monolith, a retaining wall, etc. The results of the regression analyses discussed in this report resulted in Simplified permanent displacement relationships that were developed using data generated by Newmark for an extensive data base of 122 sets of baseline corrected rock acceleration time histories in the moment magnitude 5 to 7 range. The resulting simplified permanent displacement relationships allow the engineer to rapidly determine the earthquake-induced permanent displacement for a given rock-founded structural system. This alternative procedure requires only rudimentary design/analysis ground motion characterization and use of a simplified permanent seismic displacement relationship for a sliding block (structural) system model. The resulting simplified permanent displacement relationships discussed in this report are being implemented in other Corps permanent (seismically-induced) displacement software such as CorpsWallSlip, and CorpsDamSlip.
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