ORCID Profile
0000-0001-7481-7935
Current Organisation
The University of Edinburgh
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Publisher: American Society of Civil Engineers (ASCE)
Date: 12-2020
Publisher: Elsevier BV
Date: 2017
Publisher: Elsevier BV
Date: 12-2019
Publisher: World Scientific Pub Co Pte Ltd
Date: 29-10-2015
DOI: 10.1142/S0219455415400313
Abstract: The end bearing capacity of a rectangular hollow section (RHS) steel tube can be substantially increased through local strengthening using bonded carbon fiber reinforced polymer (CFRP) plates. This paper presents a combined experimental and numerical study into the behavior of such CFRP-strengthened RHS steel tubes with particular attention to debonding failure in such tubes. The results of an experimental study are first presented, which showed that debonding failure occurred in all the CFRP-strengthened steel tubes and the effectiveness of strengthening depended significantly on the slenderness of the webs. A finite element approach for modeling the behavior of such CFRP-strengthened steel tubes is next presented, in which a coupled cohesive zone model is employed to depict the response of FRP-to-steel bonded interfaces with a linear or a nonlinear adhesive. The finite element approach, which is shown to provide close predictions for CFRP-strengthened RHS steel tubes under an end bearing load, offers a valuable tool for understanding the behavior of these CFRP-strengthened steel tubes.
Publisher: Elsevier BV
Date: 11-2021
Publisher: Informa UK Limited
Date: 27-06-2017
Publisher: Informa UK Limited
Date: 08-2013
Publisher: Elsevier BV
Date: 07-2017
Publisher: SAGE Publications
Date: 2012
DOI: 10.3141/2285-04
Abstract: The purpose of this study was to evaluate, with two probabilistic analytical models, the effectiveness of several alternative fatigue management strategies for steel bridge welds. The investigated strategies employed, in various combinations, magnetic particle inspection, gouging and rewelding, and postweld treatment by peening. The analytical models included a probabilistic strain-based fracture mechanics model and a Markov chain model. For comparing the results obtained with the two models, the fatigue life was ided into a small, fixed number of condition states based on crack depth, similar to those often used by bridge management systems to model deterioration due to other processes, such as corrosion and road surface wear. The probabilistic strain-based fracture mechanics model was verified first by comparison with design S–N curves and test data for untreated welds. Next, the verified model was used to determine the probability that untreated and treated welds would be in each condition state in a given year the probabilities were then used to calibrate transition probabilities for a much simpler Markov chain fatigue model. Then both models were used to simulate a number of fatigue management strategies. From the results of these simulations, the performance of the different strategies was compared, and the accuracy of the simpler Markov chain fatigue model was evaluated. In general, peening was more effective if preceded by inspection of the weld. The Markov chain fatigue model did a reasonable job of predicting the general trends and relative effectiveness of the different investigated strategies.
Publisher: Elsevier BV
Date: 05-2023
Publisher: Elsevier BV
Date: 05-2018
Publisher: Elsevier BV
Date: 2018
Publisher: American Society of Civil Engineers (ASCE)
Date: 04-2013
Publisher: Informa UK Limited
Date: 26-11-2015
Publisher: Elsevier BV
Date: 10-2020
Publisher: American Society of Civil Engineers (ASCE)
Date: 12-2013
Publisher: Elsevier BV
Date: 06-2016
Publisher: Elsevier BV
Date: 10-2021
Publisher: ASMEDC
Date: 2010
Abstract: Externally bonded FRP systems offer an attractive method to improve the fatigue life of steel beams. The fatigue performance of such a strengthened beam can be further enhanced by prestressing the bonded FRP reinforcement. While a number of studies have been conducted on the fatigue strengthening of steel beams using FRP, they have generally been concerned with the overall performance of the strengthened beam, with limited attention to the behaviour of the FRP-to-steel interface and its effects. Against this background, this paper presents the preliminary results of an ongoing experimental program aiming at investigating the behaviour and fatigue failure mechanism of FRP-strengthened cracked steel beams under fatigue cyclic loading, with particular emphasis on the debonding process of the FRP reinforcement and the effect of debonding on crack propagation. The effects of prestressing and debonding on the fatigue performance of the strengthened beam are clearly demonstrated by the test results.
Publisher: Elsevier BV
Date: 05-2017
Publisher: Informa UK Limited
Date: 21-03-2015
Publisher: Elsevier BV
Date: 04-2012
Publisher: Elsevier BV
Date: 10-2020
Publisher: Elsevier BV
Date: 06-2021
Publisher: SAGE Publications
Date: 09-12-2021
Abstract: Concrete-Filled Steel Tubular Structures (CFSTSs) have become popular among the structural engineering community due to significantly higher load carrying capacity compared to conventional reinforced-concrete structures. Much research has been conducted on understanding the behavior of CFSTSs under various loading conditions and design theories have been established to predict the load carrying capacities of such structures. However, existing models do not consider the effects of sustained early loads on concrete strength and elastic modulus development of CFSTSs. With the need for rapid construction, CFSTSs may be subjected to loading at an early stage before concrete is fully cured. Such early loading may incur negative effects on strength and elastic modulus development of concrete within the confined environment. This paper propose theoretical models based on the compressive packing model (CPM) to simulate strength and elastic modulus development of early-age concrete under sustained stress. Development of concrete properties at early age is described using Hydration kinetics, and maximum paste thickness in the CPM model is modified using energy conservation to simulate sustained loads. Early concrete strength and the elastic modulus development rules were investigated experimentally for sustained loads. Predictions from the proposed models are compared with conventional models from CEB-FIP Model Code. Results showed that when loaded at a very early stage, a relatively high stress to strength ratio will result in causing damage in concrete. Such damage significantly affects the strength and elastic modulus development. Compared with concrete loaded at 28 days, concrete loaded at early stages showed significant reduction in concrete strength and elastic modulus.
Publisher: American Society of Civil Engineers (ASCE)
Date: 04-2014
Publisher: Elsevier BV
Date: 03-2015
Publisher: Elsevier BV
Date: 09-2006
Publisher: Elsevier BV
Date: 12-2017
Publisher: Elsevier BV
Date: 10-2017
Publisher: Elsevier BV
Date: 07-2012
Publisher: Elsevier BV
Date: 07-2013
Location: United Kingdom of Great Britain and Northern Ireland
Location: Sri Lanka
Start Date: 2015
End Date: 2017
Funder: Australian Research Council
View Funded ActivityStart Date: 2015
End Date: 2017
Funder: Australian Research Council
View Funded ActivityStart Date: 2016
End Date: 2018
Funder: Australian Research Council
View Funded ActivityStart Date: 2017
End Date: 2017
Funder: Australian Research Council
View Funded ActivityStart Date: 2018
End Date: 2018
Funder: Australian Research Council
View Funded ActivityStart Date: 2016
End Date: 2016
Funder: Australian Research Council
View Funded Activity