Jonathan Nasr's scientific contributions
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Publications (2)
Effective-stress nonlinear dynamic analyses (NDA) were performed for a large-diameter reinforced concrete (RC) pile in multi-layered liquefiable sloped ground. The objective was to assess the effects of earthquake duration on the combination of inertia and liquefaction-induced lateral spreading. A parametric study was performed using input motions...
Effective-stress nonlinear dynamic analyses (NDA) were performed for piles in the liquefiable sloped ground to assess how inertia and liquefaction-induced lateral spreading combine in long- and short-duration motions. A parametric study was performed using input motions from subduction and crustal earthquakes covering a wide range of durations and...
Citations
... Other design codes for highway bridge structures recommend different load combinations: Washington State DOT recommends 100% lateral spreading þ25% inertia (WSDOT 2015), whereas AASHTO (2014) recommends designing piles for the simultaneous effects of inertia and lateral spreading only for largemagnitude earthquakes (M > 8). Numerical studies by one of the coauthors showed that the two loads need to be combined in design, particularly in cases where the piles are expected to yield (Khosravifar et al. 2014) and subjected to long-duration earthquakes (Nasr and Khosravifar 2018). Brandenberg et al. (2007) suggested that the simultaneous application of lateral spreading and structure inertial forces was most reasonable for stiffer pile foundations but slightly conservative for more flexible pile groups. ...
![[object Object]](https://i1.rgstatic.net/ii/profile.image/315006791421956-1452114880057_Q64/Arash-Khosravifar-2.jpg)
... The effect of motion duration on the interaction of inertial and kinematic loads is particularly important in highly seismic regions like the Pacific Northwest of the United States, where the probabilistic seismic hazard includes significant contributions from the Cascadia Subduction Zone, which is expected to produce a long-duration Magnitude 9 earthquake. Khosravifar et al. [22] and Nasr and Khosravifar [23] studied the effects of ground motion duration on inelastic pile demands on relatively stiff large diameter shafts in liquefied soils and found that inelastic pile demands are amplified in long-duration earthquakes due to incremental yielding in the plastic hinge. Dickenson et al. [24] examined the effects of long-duration motions on the seismic performance of a wharf structure at the Port of Los Angeles in a testbed study and found that plastic hinges in piles (0.6 m concrete piles) formed generally once the ground displacements passed a threshold of approximately 0.3 m. ...
