We synthesize engineering procedures for estimating the seismic performanceof major flood control levees as given in guidelines documents and design codesfrom Canada (British Columbia), China, Italy, Japan, New Zealand, and the UnitedStates of America (USA). Some guidelines carry the weight of law whereascompliance is optional for others. Most procedures combine a probabilistic groundmotion characterization with deterministic assessments of levee performance(uncoupled approach). Ground motions are typically described using peakaccelerations for reference site conditions at return periods typically ranging from100 to 2475 years. Those motions are deterministically modified for soil conditionsusing numerical simulations or ergodic site factors. Accompanying hydrologicalconditions are either not specified or are taken at a frequently encountered waterlevel (ranging from mean annual to a 4-month flood event). These demands areused in combination with various soil properties to assess the potential forliquefaction, flow failure, and permanent shear deformations. Drawing upon bestpractices identified from this review, we recommend procedures for levee riskassessment at the section-level and for levee systems.
Procedures from international guidelines for assessing seismic risk to flood control levees
Zimmaro P
;AUSILIO, Ernesto;Dente G;
2017-01-01
Abstract
We synthesize engineering procedures for estimating the seismic performanceof major flood control levees as given in guidelines documents and design codesfrom Canada (British Columbia), China, Italy, Japan, New Zealand, and the UnitedStates of America (USA). Some guidelines carry the weight of law whereascompliance is optional for others. Most procedures combine a probabilistic groundmotion characterization with deterministic assessments of levee performance(uncoupled approach). Ground motions are typically described using peakaccelerations for reference site conditions at return periods typically ranging from100 to 2475 years. Those motions are deterministically modified for soil conditionsusing numerical simulations or ergodic site factors. Accompanying hydrologicalconditions are either not specified or are taken at a frequently encountered waterlevel (ranging from mean annual to a 4-month flood event). These demands areused in combination with various soil properties to assess the potential forliquefaction, flow failure, and permanent shear deformations. Drawing upon bestpractices identified from this review, we recommend procedures for levee riskassessment at the section-level and for levee systems.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
