Abstract
This paper presents the continuation of research considering the analysis of reinforced concrete bridge knee joints subjected to in-plane seismic loads. Strut-and-tie models incorporating rational joint force transfer mechanisms were developed to capture the non-linear inelastic response measured in four large-scale bridge knee joint tests. These models corresponded to different joint reinforcement detailing types and were analysed with Drain-2DX using non-linear truss elements. Obtained results were in satisfactory agreement with the measured displacement envelopes.
Highlights
A strut-and-tie model (STM) is a discrete representation of stress fields developed within a reinforced concrete structure that is subjected to external actions
The strut-and-tie methodology is simple to comprehend, it is a surprisingly complex task when applying this technique in the structural analysis. This is because the successful correlation of a STM to actual structural performance requires sufficient knowledge of the internal force transfer mechanism, which is primarily mfluenced by the selected reinforcement detailing types and the support conditions
This paper presents a contribution to the development of a library of verified STMs for different structures with distinct reinforcement detailing types, allowing the non-linear inelastic structural response to be captured
Summary
A strut-and-tie model (STM) is a discrete representation of stress fields developed within a reinforced concrete structure that is subjected to external actions. The strut and the tie members are used to represent the actual compressive and tensile stress fields respectively This type of model has long been employed to predict the strength of structural regions, in particular where the assumption of a linear stress-strain distribution is inapplicable. Variation of the stress path position in some structural members, when at different loading states, imposes additional difficulty in identifying a suitable model for the corresponding structural system Previous application of this modelling technique has mostly been limited to the prediction of strength, with utilisation of this procedure to capture non-linear inelastic structural response being rather minimal [2]. Applicable data is presented where appropriate to assist illustration of the effectiveness of the truss analogy in describing both inelastic structural displacements and internal force demands. lt is important to note that the objective of this investigation was not to obtain a nearperfect correlation between structural and model response by repeated regeneration of the STM, but rather to develop a simple procedure for model generation that provides an elegant diagnostic tool
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