Robert Melchers

Prof. Robert Melchers

School of Engineering (Civil Engineering), University of Newcastle, Newcastle, Australia
orcid

Research Focus & Metrics

Academic Career Length

55Years (1972-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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1 July 1989 in Structural Safety
Verified
Journal Article
Closed access
Robert MelchersRobert Melchers
Robert Melchers

1 December 1997 in Journal of Structural Engineering
Verified
Journal Article
Closed access
Dimitri V. ValDimitri V. Val
Dimitri V. Val
Robert MelchersRobert Melchers
Robert Melchers
Reinforced concrete (RC) bridges deteriorate with time. This results in reduction of their resistance, and, consequently, of their reliability. Corrosion of embedded reinforcing steel is one of the main causes of deterioration. The paper presents a method for reliability assessment of RC slab bridges with corroded reinforcement. The method includes a traffic load model, a corrosion model, and a nonlinear finite element structural model. Two types of corrosion—general corrosion, including spalling and debond between concrete and the corroded reinforcement, and localized corrosion—are considered. Reliability is estimated in terms of the reliability index using the first-order reliability method. Uncertainties associated with material properties, geometry, loads, and corrosion parameters are taken into account. A sensitivity analysis of a simple span bridge is carried out to examine the influence of these uncertainties on the bridge reliability. Reliability assessment of a deteriorated three-span continuous ...

1 April 2003 in Corrosion
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Journal Article
Closed access
Robert MelchersRobert Melchers
Robert Melchers
A model is proposed for general corrosion of mild and low-alloy steels under fully aerated at-sea immersion conditions as measured by weight loss. Because all factors influencing corrosion have inherent uncertainties, the proposed model is probabilistic, composed of a mean-value function and a zero-mean uncertainty function. The mean-value function is nonlinear in time, controlled by distinctly different phases—kinetic, diffusion, and anaerobic. Literature field data as well as new field observations indicate that seawater temperature has a strong influence on each phase. The model is used to interpret literature data together with additional inferred or collected environmental data. These are then used to calibrate the parameters for the mean-value function of the model. The calibrated parameters are used to predict a consolidated plot of expected corrosion loss—time-temperature. An example application is given.

1 October 2005 in Corrosion Science
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Journal Article
Closed access
Robert MelchersRobert Melchers
Robert Melchers

1 March 1986 in Journal of Structural Engineering
Verified
Journal Article
Closed access
YYYoke Leong Yee
Yoke Leong Yee
Robert MelchersRobert Melchers
Robert Melchers
A physically based mathematical model that can predict the moment‐rotation relationships of bolted extended end‐plate eave connections, using the connection dimensions as inputs is presented. The model recognizes the bounds within which the relationship must lie, viz. the initial (elastic) stiffness, the plastic moment capacity and the strain‐hardening stiffness of the connection. Comparison is made to a series of test results for a range of bolted end‐plate moment connections.

1 October 2001 in Structural Safety
Verified
Journal Article
Closed access
XGX.L. Guan
X.L. Guan
Robert MelchersRobert Melchers
Robert Melchers