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Title: Contribution to the static and dynamic response of piles in liquefiable ground
Author: Shadlou, Masoud
ISNI:       0000 0004 5994 9501
Awarding Body: University of Bristol
Current Institution: University of Bristol
Date of Award: 2016
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New and existing superstructures (such as bridges and buildings) supported on pile foundations and located in sites susceptible to liquefaction and lateral spreading are required to be assessed or designed to withstand the actions of extreme loads. As a result, the performance of the piles, foundations, and also superstructures must be estimated/predicted by sufficient accuracy using dynamic analysis. Usually a large number of analyses are required for assessing the performance of a dynamic system and obtaining the analytical fragility functions, as an example. Simplified-conventional solutions may not be accurate enough to address the complex dynamic phenomena involved in soil-pile interaction in liquefiable soil. In order to achieve this, it is necessary to simulate soil-pile system using a reliable method supported by realistic soil constitutive relations surrounding the pile. Therefore, a hypo-elastic bounding surface model has been developed in the framework of the macro-element to underpin and facilitate the concerns of 'performance-based design' and 'risk assessments'. In this case, it is expected that the macro-element approach is able to feedback quick response with high accuracy comparable to sophisticated and complex Finite Element (FE) models. Following the concept of hypo-elasticity, elastic stiffness of the macro-element should be estimated accurately. In this case, an elasto-dynamic solution has been developed for analyzing the soil-pile system under the pile-head and the kinematic earthquake loading. This method is also generalized for different types of pile foundations ranging from the short piles/caissons to long/flexible piles. Validations and verifications of the macro-element approach show its high accuracy on simulating the field test and dynamic centrifuge. It is concluded to move step forward by utilizing the macro-element for soil-pile system in liquefiable ground in order to produce precise results. Finally, a simple method for calculating the dynamic bending moment in pre-liquefaction phase (cyclic mobility phase) is proposed for the geotechnical desk study using the elastic continuum solution.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available