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• W2588032642 abstract "This thesis is concerned with the application of model updating techniques to structures whose dynamic performance is affected by static loading. The influence of structural loading is identified as important in dynamical terms. As a result, experimentally determined dynamic data should not necessarily be regarded as being uniquely representative of a structure. This observation has particular significance to the likelihood of success of model updating. Indeed the major source of error in dynamic finite element modelling may well be the omission of static loads. There are strong repercussions for schemes which use dynamic data for damage detection. The methods for including load-effects in dynamic finite element models are outlined. A “static updating” technique which takes into account nonlinear geometry effects is demonstrated by means of experimental case studies. This technique is shown to produce finite element models of structures which match measured dynamic data. Two new types of updating parameters are introduced in this thesis which allow the effects of loading to be accounted for in a finite element model. The parameters are shown to be suitable for implementation in the popular sensitivity based approach to updating. The first parameter accounts for the effects of stress stiffening in struts or beams and the second allows rigid body rotation of these types of elements. The changes made to beam type elements, while physically realistic, are shown not to be members of the generic beam element family. The stress stiffening parameter is shown to allow loading in structural frames to be identified from dynamic data even with no a priori knowledge of load state. The rigid body rotation term is shown in the case of a 2D beam to allow identification of deformation given limited initial knowledge of the deflected shape. An extension of the latter technique is developed which allows the magnitude of pre-defined deflection shapes or “profiles” to be updated. An experimental case study is presented in which success is achieved in updating a finite element model of the structure to account for load effects. Axial loads identified in a frame are shown to compare satisfyingly with static measurements of loading. The convergence is found to be reliable and robust, even when including other updating parameters. A strategy for model updating is proposed which includes the effects of static loading. The approach should be adopted whenever static loading is suspected of influencing dynamic behaviour." @default.
• W2588032642 created "2017-02-24" @default.
• W2588032642 creator A5002635853 @default.
• W2588032642 date "1999-01-01" @default.
• W2588032642 modified "2023-09-26" @default.
• W2588032642 title "Dynamic finite element modelling and updating of loaded structures" @default.
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