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Nonlinear dynamic analysis of large scale structures

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Title: Nonlinear dynamic analysis of large scale structures
Authors: Gu, Jiaping
Item Type: Thesis or dissertation
Abstract: The nonlinear dynamic analysis to obtain the response of whole building structures or structural components under blast loading can be computationally prohibitive. Two approaches have been considered in this study to improve the efficiency of such analyses: i) to employ an appropriate time integration scheme and, ii) to employ accurate simplified models of structural components. A new implicit-explicit time integration scheme has been developed and implemented with a novel automatic element-based mesh partitioning approach. The scheme allows simultaneous execution of implicit integration and explicit integration in different parts of a system to maximise computational efficiency. The developed scheme has also been notably incorporated to the novel domain decomposition approach developed previously at Imperial College London. The scheme is also successfully incorporated with the mixed-dimensional coupling technique included in the domain decomposition approach. Simplified models of structural components have been improved for a better representation of responses under blast loading. Mechanical models of fin plate connections have been modified by including material nonlinearity and material strain rate effect in the coupled axial and shear response of bolt rows. The flat shell elements have been verified in their ability to capture the influence of transverse damage in floor slabs due to uplift on the in-plane diaphragm stiffness and strength. These simplified models have been incorporated in the global model of a reference building, which has been analysed and assessed under characteristic blast loading. Typical masonry cavity cladding has been investigated as a case study. The failure mode and the interaction between the cladding and the structural frame have been successfully obtained from mesoscale models employing the mixed-dimensional domain decomposition approach and the implicit-explicit time integration scheme. A SDOF model based on the results of the detailed model has been constructed and incorporated in the global model of the reference building.
Content Version: Open Access
Issue Date: May-2018
Date Awarded: Sep-2018
URI: http://hdl.handle.net/10044/1/63829
DOI: https://doi.org/10.25560/63829
Supervisor: Izzuddin, Bassam
Sponsor/Funder: European Union
Funder's Grant Number: RFSR-CT-2013-00020
Department: Civil and Environmental Engineering
Publisher: Imperial College London
Qualification Level: Doctoral
Qualification Name: Doctor of Philosophy (PhD)
Appears in Collections:Civil and Environmental Engineering PhD theses



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