Reducing Seismic Risk to Highway Mobility: Assessment and Design Examples for Pile Foundations Affected by Lateral Spreading

Ashford, Scott A.; Scott, Michael H.; Rayamajhi, Deepak

doi:10.15760/trec.66

Cited by 4 publications

(2 citation statements)

References 74 publications

(99 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…ASCE/COPRI 61 (2014) assumes independent effects of these loads for port facilities, although it recommends evaluating this assumption on a project-specific basis. Caltrans (2012) and ODOT (Ashford et al 2012) recommend combining 100% lateral spreading with 50% inertia. WSDOT (2015), on the other hand, recommends 100% lateral spreading with 25% inertia.…”

Section: Introductionmentioning

confidence: 99%

Modified design procedures for bridge pile foundations subjected to liquefaction-induced lateral spreading

Khosravifar

Nasr²

2017

DFI Journal - The Journal of the Deep Foundations Institute

View full text Add to dashboard Cite

show abstract

Section: Introductionmentioning

confidence: 99%

Modified design procedures for bridge pile foundations subjected to liquefaction-induced lateral spreading

Khosravifar

Nasr²

2017

DFI Journal - The Journal of the Deep Foundations Institute

View full text Add to dashboard Cite

show abstract

“…This method is mostly used for flexible laterally loaded piles and is based on a beam on nonlinear wrinkler foundation, hence pile and soil modelling. Ashford et al, (2013) stated that this method uses a series of nonlinear soil springs to represent a relationship between soil resistance, p, and relative deflection, y. The method relies on a series of p-y curves which depend on data from lateral pile load tests (Zhang, 2009).…”

Section: A) the Subgrade Methodsmentioning

confidence: 99%

An Innovative Foundation System For Bollards and Barriers

Adom¹

View full text Add to dashboard Cite

Vehicle barriers are high security infrastructure systems commonly used for protection of buildings and infrastructure. The global increase in terrorism as well as the need to effectively protect humans and infrastructure has led to various research on improving security infrastructure systems. One of the several alternatives for providing security to infrastructure is the use of anti-ram vehicle barriers such as bollards. A vehicular bollard is a barrier system used to restrict movement of vehicles around buildings. An important factor to consider in the design of a bollard is the impact resistance of the bollard which is dependent on its foundation. Previous studies conducted on foundation systems for bollards mostly focuses on the use of shallow concrete foundation systems. However, a simple deep foundation technology can be employed for bollards with minimum cost. This thesis investigates the use of such deep foundation technology for bollards.An extensive experimental study into innovative foundation systems for vehicle bollards using soil was conducted in the laboratory to evaluate the performance of different pile systems under both static and impact lateral loads. The results demonstrated that part of the bollard can be used as a pile to design a simple deep foundation system which is capable of resisting the vehicular load acting on the bollard. The implementation of Fins on the pile significantly increased the resistance capacity of the foundation under lateral impact loads.ii Dedication I dedicate this thesis to my parents, siblings, and friends and love ones who have supported me throughout my entire studies. I love you all. God bless you.iii

show abstract

Development of a Design Guideline for Bridge Pile Foundations Subjected to Liquefaction-Induced Lateral Spreading

Nasr

2018

View full text Add to dashboard Cite

Effective-stress nonlinear dynamic analyses (NDA) were performed for piles in liquefiable sloped ground to assess how inertia and liquefaction-induced lateral spreading combine in long-duration vs. short-duration earthquakes. A parametric study was performed using input motions from subduction and crustal earthquakes covering a wide range of earthquake durations. The NDA results were used to evaluate the accuracy of the equivalent static analysis (ESA) recommended by Caltrans/ODOT for estimating pile demands. Finally, the NDA results were used to develop new ESA methods to combine inertial and lateral spreading loads for estimating elastic and inelastic pile demands. The NDA results showed that pile demands increase in liquefied conditions compared to nonliquefied conditions due to the interaction of inertia (from superstructure) and kinematics (from liquefaction-induced lateral spreading). Comparing pile demands estimated from ESA recommended by Caltrans/ODOT with those computed from NDA showed that the guidelines by Caltrans/ODOT (100% kinematic combined with 50% inertia) slightly underestimates demands for subduction earthquakes with long durations. A revised ESA method was developed to extend the application of the Caltrans/ODOT method to subduction earthquakes. The inertia multiplier was back-calculated from the NDA results and new multipliers were proposed: 100% Kinematic + 60% Inertia for crustal earthquakes and 100% Kinematic + 75% Inertia for subduction earthquakes. The proposed ESA compared reasonably well against the NDA results for elastic piles. The revised method also made possible to estimate demands in piles that performed well in the dynamic analyses but could not be analyzed using Caltrans/ODOT method (i.e. inelastic piles that remained below Fult on the liq pushover curve). However, it was observed that the pile demands became unpredictable for cases where the pile head displacement exceeded the displacement corresponding to the ultimate pushover force in liquefied conditions. Nonlinear dynamic analysis is required for these cases to adequately estimate pile demands.

show abstract

Reducing Seismic Risk to Highway Mobility: Assessment and Design Examples for Pile Foundations Affected by Lateral Spreading

Cited by 4 publications

References 74 publications

Modified design procedures for bridge pile foundations subjected to liquefaction-induced lateral spreading

Modified design procedures for bridge pile foundations subjected to liquefaction-induced lateral spreading

An Innovative Foundation System For Bollards and Barriers

Development of a Design Guideline for Bridge Pile Foundations Subjected to Liquefaction-Induced Lateral Spreading

Contact Info

Product

Resources

About