Professor Marios Chryssanthopoulos
Professor of Structural Systems
Qualifications: BSc, MS, PhD, DIC, CEng, FICE, FIStructE
Email: mkchry@surrey.ac.uk
Phone: Work: 01483 68 6632
Room no: 24 AA 03
Further information
Biography
Marios joined the University of Surrey in June 2000 as Professor of Structural Systems. He originally trained as a Naval Architect at the University of Newcastle and MIT, and then read for a PhD in Structural Engineering at Imperial College where he was also employed as Lecturer and British Steel Reader in Structures from 1989 until 2000. Before embarking on an academic career, he worked in industry with Flint and Neill on the design of aluminium bridges and with Det norske Veritas on the reliability of offshore structures. His research focuses on risk-based performance of structures and infrastructure systems and the development of decision support tools for asset management, for which he has been funded by EPSRC, the European Union and industry. He has published over 150 scientific articles and several book chapters and has lectured widely in the UK and overseas, including a fellowship in Japan sponsored by the Japan Society for the Promotion of Science. He has acted as the convenor of an international working group on structural reliability and probabilistic design, operating under the auspices of the Joint Committee for Structural Safety (JCSS) and has served on national and European advisory and codification committees, including the UK Standing Committee on Structural Safety (SCOSS), the Eurocode 3 Drafting Panel on Shell Structures and the working group on the revision of ISO2394: General Principles on the Reliability of Structures.
Marios has served as the external examiner of undergraduate and post-graduate programmes at the Universities of Aberdeen, Edinburgh, Newcastle and Trinity College Dublin, and has been a PhD examiner in over 20 universities both in the UK and overseas. He is an editorial board member of Structural Safety (Elsevier), Journal of Earthquake Engineering and Structure and Infrastructure Engineering (Taylor and Francis).
Research Interests
These relate to how randomness, variability and uncertainties in human and organisational factors influence the response of structural and infrastructure systems subject to natural and man-made hazards, and the development of risk-based performance standards. Over the past twenty years, a wide range of experimental, analytical and design-orientated studies have been undertaken, encompassing steel and fibre reinforced composite plates and shells, concrete and steel building frames, as well as metallic, concrete and FRP bridges. Increasingly, research has been directed towards the integration of advanced structural engineering and structural health monitoring into consequence analysis and loss estimation in support of risk-informed decision-making tools for structural systems and infrastructure networks. In the course of these investigations, he has supervised over 25 PhD theses and numerous MSc dissertations, has collaborated widely with industry and academics, and has co-authored over 150 publications in archival journals and international conference proceedings; examples of recent research projects include:
• Probabilistic modelling of performance profiles and life-cycle assessment
• Fragility, damage and loss estimation for buildings under seismic loading
• Spatial variability of material properties and deterioration processes
• Imperfection sensitivity and damage tolerance of steel shell structures
• Structural Health Monitoring of metallic bridges
• Repair of metallic structures using FRP materials
• Reliability-based fatigue life prediction of bridges and offshore structures
Publications
Journal articles
- . (2012) 'Fatigue system reliability analysis of riveted railway bridge connections'. Structure and Infrastructure Engineering, 8 (10), pp. 967-984.
- . (2012) 'Physical characterization of reinforcing bar corrosion in concrete'. Bridge Maintenance, Safety, Management, Resilience and Sustainability - Proceedings of the Sixth International Conference on Bridge Maintenance, Safety and Management, , pp. 274-281.
- . (2012) 'Assessing the consequences of building failures'. Structural Engineering International: Journal of the International Association for Bridge and Structural Engineering (IABSE), 22 (1), pp. 99-104.
- . (2012) 'Towards a SHM-based methodology for updating fatigue reliability of orthotropic steel decks'. Bridge Maintenance, Safety, Management, Resilience and Sustainability - Proceedings of the Sixth International Conference on Bridge Maintenance, Safety and Management, , pp. 232-238.
- . (2012) 'SmartEN - Smart management for sustainable built environment including bridges, structures and infrastructure systems'. Bridge Maintenance, Safety, Management, Resilience and Sustainability - Proceedings of the Sixth International Conference on Bridge Maintenance, Safety and Management, , pp. 290-297.
- . (2012) 'Causes and consequences of metallic bridge failures'. Structural Engineering International: Journal of the International Association for Bridge and Structural Engineering (IABSE), 22 (1), pp. 93-98.
- . (2011) 'Debonding of adhesively bonded composite patch repairs of cracked steel members'. Elsevier COMPOSITES PART B-ENGINEERING, 42 (5), pp. 1262-1270.
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(2011) 'Robustness of structures- A report on a joint European project'. Applications of Statistics and Probability in Civil Engineering -Proceedings of the 11th International Conference on Applications of Statistics and Probability in Civil Engineering, , pp. 2129-2135.doi: 10.1201/b11332-314
- . (2011) 'A simplified fragility methodology for regular steel MRFs'. Journal of Earthquake Engineering, 15 (3), pp. 390-403.
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(2011) 'Random field modelling of spatial variability in FRP composite materials'. Applications of Statistics and Probability in Civil Engineering -Proceedings of the 11th International Conference on Applications of Statistics and Probability in Civil Engineering, , pp. 2335-2342.doi: 10.1201/b11332-344
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(2011) 'Probabilistic estimates of scenario loss through a two-stage Monte Carlo approach'. Applications of Statistics and Probability in Civil Engineering -Proceedings of the 11th International Conference on Applications of Statistics and Probability in Civil Engineering, , pp. 252-259.doi: 10.1201/b11332-38
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(2011) 'A ground motion record selection procedure utilizing a vector-valued intensity measure for optimized incremental dynamic analysis'. Applications of Statistics and Probability in Civil Engineering -Proceedings of the 11th International Conference on Applications of Statistics and Probability in Civil Engineering, , pp. 168-175.doi: 10.1201/b11332-26
- . (2010) 'A critical reliability evaluation of fibre reinforced composite materials based on probabilistic micro and macro-mechanical analysis'. Composites Part B: Engineering, 41 (6), pp. 446-453.
- . (2010) 'Network level deterioration modeling: A case study on masonry arch bridges'. Bridge Maintenance, Safety, Management and Life-Cycle Optimization - Proceedings of the 5th International Conference on Bridge Maintenance, Safety and Management, , pp. 1213-1220.
- . (2009) 'Quantification of uncertainty modelling in stochastic analysis of FRP composites'. Composites Part A: Applied Science and Manufacturing, 40 (11), pp. 1673-1684.
- . (2009) 'Probabilistic models for spatially varying mechanical properties of in-service gfrp cladding panels'. Journal of Composites for Construction, 13 (2), pp. 159-167.
- . (2009) 'Assessment of debonding in GFRP joints using damage identification techniques'. Construction and Building Materials, 23 (4), pp. 1690-1697.
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(2008) 'Fatigue analysis of riveted railway bridge connections using the theory of critical distances'. Elsevier Engineering Structures, 30 (10), pp. 2707-2715.Full text is available at: http://epubs.surrey.ac.uk/47128/
Abstract
Recent studies have found that stringer-to-cross-girder connections in riveted railway bridges are susceptible to fatigue cracking, caused by secondary, deformation induced effects. These effects are difficult to interpret in terms of a single applied stress descriptor, which is customarily used in an S–N assessment. In order to address this problem, the results of a global–local finite element analysis of a riveted railway bridge are used in this paper within the context of the theory of critical distances (TCD). Using the TCD in the way proposed by Taylor [Bellett D, Taylor D, Marco S, Mazzeo E, Guillois J, Pircher T. The fatigue behaviour of three-dimensional stress concentrations. Int J Fatigue 2005; 27(3) 207–21], fatigue damage (a) is shown to converge upon mesh refinement and (b) is found to be relatively sensitive to the selection of the characteristic dimension of the critical volume. Furthermore, comparisons of the TCD-based method with its more traditional, detail-specific S–N counterpart, reveal that the latter can underestimate fatigue damage, in some cases by a factor of 3.5.
- . (2008) 'Fragility and hazard analysis of a welded steel moment resisting frame'. Journal of Earthquake Engineering, 12 (4), pp. 596-615.
- . (2008) 'Probabilistic fatigue evaluation of riveted railway bridges'. Journal of Bridge Engineering, 13 (3), pp. 237-244.
- . (2008) 'The effect of joint ductility on the seismic fragility of a regular moment resisting steel frame designed to EC8 provisions'. Journal of Constructional Steel Research, 64 (9), pp. 987-996.
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(2007) 'Numerical modelling of riveted railway bridge connections for fatigue evaluation'. Engineering Structures, 29 (11), pp. 3071-3081.Full text is available at: http://epubs.surrey.ac.uk/47130/
Abstract
Past experience has shown that stringer-to-cross-girder connections in riveted railway bridges are susceptible to fatigue cracking. This fatigue damage is caused by secondary stresses, which develop in the different components of the connection. For this reason, more detailed analysis techniques are needed to capture this type of behaviour. In this paper, a finite element (FE) model of a typical riveted railway bridge is developed by incorporating the detailed local geometry of a stringer-to-cross-girder connection into the global bridge model. Before the development of this model, benchmark FE studies are carried out on a double-lap joint and the results are presented in terms of stress concentration factors and stress gradients. Further verification studies are carried out on a local bridge connection FE model, in terms of its rotational stiffness. After this investigation, a refined FE model of the bridge is analysed under the passage of a freight train. Principal stress histories at different components of the connection are obtained, which are then combined with the plain material S-N curve, in order to identify the most fatigue-critical locations of the connection. These are identified as being the rivet holes and, in some cases, the angle fillet. By considering different rivet clamping stresses and different rivet defect scenarios it is found that the most damaging effects are caused by the presence of clearance between the rivet shank and the hole, and the loss of a rivet. The rivet clamping stress is also found to affect fatigue damage considerably. © 2007 Elsevier Ltd. All rights reserved.
- . (2006) 'Professor Patrick J. Dowling CBE DL FREng FRS - Preface'. ELSEVIER SCI LTD JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH, 62 (11), pp. 1041-1042.
- . (2006) 'Sensitivity of uncertainties in performance prediction of deteriorating concrete structures'. TAYLOR & FRANCIS LTD STRUCTURE AND INFRASTRUCTURE ENGINEERING, 2 (2), pp. 117-130.
- . (2006) 'Selection of carbon-fiber-reinforced polymer systems for steelwork upgrading'. Journal of Materials in Civil Engineering, 18 (5), pp. 641-649.
- . (2006) 'Analytical fatigue assessment of riveted rail bridges'. Proceedings of the Institution of Civil Engineers: Bridge Engineering, 159 (3), pp. 105-116.
- . (2006) 'Parametric evaluation of CFRP patch effectiveness in fatigue repair'. Proceedings of the 3rd International Conference on Bridge Maintenance, Safety and Management - Bridge Maintenance, Safety, Management, Life-Cycle Performance and Cost, , pp. 337-338.
- . (2006) 'Construction and Building Materials: Guest editorial'. Construction and Building Materials, 20 (1-2), pp. 1-1.
- . (2006) 'Strengthening of an artificially degraded steel beam utilising a carbon/glass composite system'. Construction and Building Materials, 20 (1-2), pp. 11-21.
- . (2006) 'Fatigue reliability of welded steel structures'. Journal of Constructional Steel Research, 62 (11), pp. 1199-1209.
- . (2006) 'Editorial'. Composites Part A: Applied Science and Manufacturing, 37 (8), pp. 1101-1101.
- . (2005) 'Simulation of Damage Scenarios in an FRP Composite Suspension Footbridge'. Key Engineering Materials, 293-294, pp. 599-606.
- . (2004) 'Performance updating of concrete bridges using proactive health monitoring methods'. Reliability Engineering & System Safety, 86 (3), pp. 247-256.
- . (1995) 'Characterization of manufacturing effects for buckling-sensitive composite cylinders'. Composites Manufacturing, 6 (2), pp. 93-101.
- . (1994) 'AN ANALYTICAL SOLUTION FOR THE PROBABILISTIC RESPONSE OF SDOF NONLINEAR RANDOM-SYSTEMS SUBJECTED TO VARIABLE AMPLITUDE CYCLIC LOADING'. JOHN WILEY & SONS LTD EARTHQUAKE ENGINEERING & STRUCTURAL DYNAMICS, 23 (5), pp. 489-506.
- . (1991) 'EFFECT OF RANDOM MATERIAL VARIABILITY ON SEISMIC DESIGN PARAMETERS OF STEEL FRAMES'. JOHN WILEY & SONS LTD EARTHQUAKE ENGINEERING & STRUCTURAL DYNAMICS, 20 (2), pp. 101-114.
Conference papers
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(2011) 'Modelling of Failure Consequences for Robustness Evaluation'. IABSE/IASS London, UK: IABSE–IASS Symposium: Taller, Longer, LighterFull text is available at: http://epubs.surrey.ac.uk/47148/
Abstract
Structural failure consequences can take many different forms: from material/structural damage and human injuries/fatalities, to functional downtime and environmental impact, as well as loss of reputation and collateral damage that may be orders of magnitude higher than the reconstruction cost. Within a risk-based robustness framework, consequence modelling is an important step in estimating risk, and needs to be undertaken with clarity and transparency. This paper highlights the principles to be adopted in estimating consequences arising from potential building and bridge failures. The two structural forms are chosen so as to elucidate factors relevant to cases where failure is confined to a single facility, or where it is likely to affect a spatial network. Past experience, as well as methods that are increasingly used in emergency response planning, are reviewed. A categorisation of failure consequences is presented, together with associated models for quantifying their magnitude.
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(2011) 'Dynamic FE analysis of a continuous steel railway bridge and comparisons with field measurements'. Wroclaw, Poland: 12th International Conference on Metal Structures (ICMS)Full text is available at: http://epubs.surrey.ac.uk/47132/
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(2010) 'A review of metallic bridge failure statistics'. CRC Press Bridge Maintenance, Safety and Management: Proceedings of the Fifth International IABMAS Conference, Philadelphia, USA: IABMAS 2010, pp. 3275-3282.Full text is available at: http://epubs.surrey.ac.uk/47133/
Abstract
This paper presents a review of bridge failure statistics, based on literature survey and webbased search, focusing on metallic bridges. Failure cases are distinguished between those resulting in bridge collapse and those that have not reached collapse but resulted in loss of serviceability. Classification of the most common failure causes and modes of failure is undertaken. Statistics regarding the time frame of collapses in the bridge lifetime, bridge structural configuration and the number of resulting casualties are presented. The results show that collapses due to natural hazards, design errors and limited knowledge are the most commonly encountered in metallic bridges, followed by accidents and human error. When analysed chronologically, the data demonstrates a decreasing trend for collapses attributed to limited knowledge and an increasing trend in failures resulting from accidents and natural hazards. In terms of non-collapse cases, fatigue failures are found to be predominant. The paper concludes with a discussion of bridge failure consequences and their significance in risk assessment of bridge structures.
- . (2010) 'Network Level Deterioration Modelling: A case study on masonry arch bridges'. CRC Press CD-Rom Proceedings, Philadelphia, USA: The fifth international conference on bridge maintenance, safety and management, IABMAS 2010
- . (2010) 'A review of metallic bridge failure statistics'. Bridge Maintenance, Safety, Management and Life-Cycle Optimization - Proceedings of the 5th International Conference on Bridge Maintenance, Safety and Management, , pp. 3275-3282.
- . (2009) 'Random field characterisation of GFRP composite properties'. ICCM International Conferences on Composite Materials, Edinburgh, UK: 17th ICCM
- . (2009) 'Dynamic assessment of a FRP suspension footbridge'. Advanced Composites in Construction 2009, ACIC 2009 - Proceedings of the 4th International Conference, , pp. 144-155.
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(2009) 'Global-local finite element analysis of riveted railway bridge connections for fatigue evaluation'. Taylor and Francis Bridge Maintenance, Safety Management, Health Monitoring and Informatics - IABMAS '08, Seoul, Korea: Proceedings of the 4th International Conference on Bridge MaintenanceFull text is available at: http://epubs.surrey.ac.uk/47135/
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(2007) 'Probabilistic fatigue load spectra for riveted railway bridges'. APPLICATIONS OF STATISICS AND PROBABILITY IN CIVIL ENGINEERING, , pp. 73-74.Full text is available at: http://epubs.surrey.ac.uk/47136/
- . (2007) 'Probabilistic fatigue load spectra for riveted railway bridges'. Tokyo, Japan: Proceedings of the 10th International Conference on Applications of Statistics and Probability in Civil Engineering
- . (2007) 'A probabilistic methodology for sustainable bridge management'. TAYLOR & FRANCIS LTD LIFE-CYCLE COST AND PERFORMANCE OF CIVIL INFRASTRUCTURE SYSTEMS, Seoul, SOUTH KOREA: 5th International Workshop on Life-Cycle Cost Analysis and Design of Civil Infrastructure Systems, pp. 181-189.
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(2006) 'Probabilistic fatigue life estimates for riveted railway bridges'. Proceedings of the 3rd International Conference on Bridge Maintenance, Safety and Management - Bridge Maintenance, Safety, Management, Life-Cycle Performance and Cost, , pp. 499-500.Full text is available at: http://epubs.surrey.ac.uk/47140/
Abstract
A large percentage of the railway bridges in the UK rail network and around Europe are of riveted construction exceeding in many cases 100 years of age. The remaining fatigue life of these bridges is difficult to estimate due to the uncertainties regarding the fatigue behaviour of wrought-iron and older steel material which were used for their construction. The problem is further compounded by the uncertainties associated with the loading both past and future. Previous global finite element analyses of a typical wrought-iron riveted railway bridge have shown that the fatigue critical details are the inner stringer-to-cross-girder connections (Imam et al. 2005). The analyses were carried out under a historical load model (Imam et al. 2005), developed to represent rail traffic in the period 1900-1970, and present day traffic (BS5400 1980) for the period 1970 onwards. Deterministic remaining fatigue life estimates of the connections were found to be sensitive to the level of dynamic amplification as well as the fatigue classification of the details. Following this work, this paper presents probabilistic fatigue life estimates for the most highly damaged stringer-to-cross-girder connection, as identified by the global analysis of the riveted bridge. On the loading side, the problem is randomised through the frequency of train traffic, dynamic amplification and uncertainties regarding the difference between actual and calculated stresses. On the response side, different assumed S-N curves used for detail classification and the Miner sum are also treated as random. The probabilistic analysis, which is carried out using Monte Carlo simulation, shows that the most heavily fatigue-loaded stringer-to-cross-girder connection has considerable fatigue life reserve. Through a sensitivity study, it is found that for a 2.3% probability of failure, the remaining fatigue life of the investigated connection is equal to 68 years for a pessimistic scenario. Under a more realistic combination of variables (base model), the 2.3% characteristic remaining fatigue life is found to be 480 years. Figure 1 shows the effect of different variables on the time to attainment of a 2.3% probability of failure assuming a base model. It can be seen that fatigue life estimates exhibit the highest sensitivity to detail classification, in other words the constant amplitude fatigue behaviour of the detail, and the factor α, which takes into account the difference between measured and calculated s
- . (2006) 'Predictive SHM-supported deterioration modelling of reinforced concrete bridges'. Proceedings of the 3rd International Conference on Bridge Maintenance, Safety and Management - Bridge Maintenance, Safety, Management, Life-Cycle Performance and Cost, , pp. 595-596.
- . (2005) 'Improvement in performance of corroding concrete structures using health monitoring systems'. Lisbon, Portugal: The European Corrosion Congress, EUROCORR 2005, pp. 330-330.
- . (2004) 'Sensitivity analysis of chloride induced deterioration models for concrete bridges'. A.A. Balkema Publishers CD-Rom Proceedings, Kyoto, Japan.: Second International Conference on Bridge Maintenance, safety and management, IABMAS 2004
- . (2003) 'The JCSS Probabilistic Model Code: Experience and recent developments'. MILLPRESS SCIENCE PUBLISHERS APPLICATIONS OF STATISTICS AND PROBABILITY IN CIVIL ENGINEERING, VOLS 1 AND 2, SAN FRANCISCO, CA: 9th International Conference on Applications of Statistics and Probability in Civil Engineering, pp. 907-912.
- . (2003) 'Mission and work program of the Joint Committee on Structural Safety'. MILLPRESS SCIENCE PUBLISHERS APPLICATIONS OF STATISTICS AND PROBABILITY IN CIVIL ENGINEERING, VOLS 1 AND 2, SAN FRANCISCO, CA: 9th International Conference on Applications of Statistics and Probability in Civil Engineering, pp. 989-994.
- . (1995) 'The influence of material variability on failure mode control of steel frames'. A A BALKEMA EUROPEAN SEISMIC DESIGN PRACTICE, CHESTER, ENGLAND: 5th SECED Conference on European Seismic Design Practice, pp. 245-251.
- . (1995) 'Response statistics of non-linear SDOF systems with random properties'. A A BALKEMA 10TH EUROPEAN CONFERENCE ON EARTHQUAKE ENGINEERING, PROCEEDINGS, VOLS 1-4, TU VIENNA, VIENNA, AUSTRIA: 10th European Conference on Earthquake Engineering, pp. 1327-1332.
- . (1991) 'BUCKLING BEHAVIOR OF COMPOSITE SHELLS UNDER COMBINED LOADING'. ELSEVIER APPL SCI PUBL LTD BUCKLING OF SHELL STRUCTURES, ON LAND, IN THE SEA AND IN THE AIR, LYON, FRANCE: INTERNATIONAL COLLOQUIUM ON BUCKLING OF SHELL STRUCTURES, ON LAND, IN THE SEA AND IN THE AIR, pp. 53-60.
Teaching
- Introduction to Structural Design, 1st year Civil Engineering, 2004 - onwards.
- Structural Analysis (Plates/Stability), 3rd year Civil Engineering, 2010 – onwards.
- Structural Safety and Reliability, MSc in Bridge/Civil/Structural Engineering, 2000 - onwards.
- Bridge Management, MSc in Bridge/Civil/Structural/Bridge Engineering, 2000 – onwards.
- Advanced Composites in Construction, MSc in Bridge/Civil/Structural Engineering, 2003 - 09.
- Bridge Deck Loading, MSc in Bridge/Civil/Structural Engineering, 2012 - onwards.
From 2001 until 2004 Marios acted as the Director of the Engineering Materials and Structures Research Centre, comprising 10 academics and over 30 research students and assistants. Subsequently acted as Deputy Director of the Centre for Materials, Surfaces and Structural Systems, a larger grouping which included chemists and materials scientists, as well as civil and mechanical engineers. In 2006, he was appointed to the RAE Task Group for the School of Engineering, which prepared the submission to General Engineering for RAE2008. From October 2007 until November 2012, he served as Head of the Division of Civil, Chemical and Environmental Engineering, one of the largest academic units in the Faculty of Engineering and Physical Sciences.

