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A platform for research: civil engineering, architecture and urbanism
Seismic response of retaining walls with cohesive backfill: Centrifuge model studies
Abstract Observations from recent earthquakes show that retaining structures with non-liquefiable backfills perform extremely well; in fact, damage or failures related to seismic earth pressures are rare. The seismic response of a 6-m-high braced basement and a 6-m free-standing cantilever wall retaining a compacted low plasticity clay was studied in a series of centrifuge tests. The models were built at a 1/36 scale and instrumented with accelerometers, strain gages and pressure sensors to monitor their response. The experimental data show that the seismic earth pressure on walls increases linearly with the free-field PGA and that the earth pressures increase approximately linearly with depth, where the resultant acts near 0.33H above the footing as opposed to 0.5–0.6H, which is suggested by most current design methods. The current data suggest that traditional limit equilibrium methods yield overly conservative earth pressures in areas with ground accelerations up to 0.4g.
Highlights Classic limit state theories yields very large earth pressures when PGA>0.4g. Soil compaction and cohesion significantly reduce the total earth pressure. Experimental data show that seismic earth pressures increase linearly with depth. The dynamic load increment increases linearly with the free field acceleration.
Seismic response of retaining walls with cohesive backfill: Centrifuge model studies
Abstract Observations from recent earthquakes show that retaining structures with non-liquefiable backfills perform extremely well; in fact, damage or failures related to seismic earth pressures are rare. The seismic response of a 6-m-high braced basement and a 6-m free-standing cantilever wall retaining a compacted low plasticity clay was studied in a series of centrifuge tests. The models were built at a 1/36 scale and instrumented with accelerometers, strain gages and pressure sensors to monitor their response. The experimental data show that the seismic earth pressure on walls increases linearly with the free-field PGA and that the earth pressures increase approximately linearly with depth, where the resultant acts near 0.33H above the footing as opposed to 0.5–0.6H, which is suggested by most current design methods. The current data suggest that traditional limit equilibrium methods yield overly conservative earth pressures in areas with ground accelerations up to 0.4g.
Highlights Classic limit state theories yields very large earth pressures when PGA>0.4g. Soil compaction and cohesion significantly reduce the total earth pressure. Experimental data show that seismic earth pressures increase linearly with depth. The dynamic load increment increases linearly with the free field acceleration.
Seismic response of retaining walls with cohesive backfill: Centrifuge model studies
Candia, Gabriel (author) / Mikola, Roozbeh Geraili (author) / Sitar, Nicholas (author)
Soil Dynamics and Earthquake Engineering ; 90 ; 411-419
2016-09-10
9 pages
Article (Journal)
Electronic Resource
English
Seismic response of retaining walls with cohesive backfill: Centrifuge model studies
| British Library Online Contents | 2016
Seismic response of retaining walls with cohesive backfill: Centrifuge model studies
| Online Contents | 2016
Seismic motion response and fragility analyses of cantilever retaining walls with cohesive backfill
| British Library Online Contents | 2018
Seismic motion response and fragility analyses of cantilever retaining walls with cohesive backfill
| British Library Online Contents | 2018
Seismic motion response and fragility analyses of cantilever retaining walls with cohesive backfill
| British Library Online Contents | 2018