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Keywords: complex systems, performance-based design, suspension bridge, modelling and analysis management, serviceability performance, synthesis.

Summary

In this paper some activities of modelling and analyses of the structural behaviour of the Messina Strait Bridge are presented. The target of the analyses was the exploration of the superstructure, in terms of safety and serviceability, useful to express an adequate technical judgement about the feasibility and the technical performances of the bridge. The activities conducted have been an useful support for the updating of the design and for the draft of the design specifications.

In the paper the critical phases for the assessment of the performance of the bridge are given:

Acquisition of data: the activities started from the state of art of the bridge as in its first structural and geometric solution, the basis of the design, statement of fixed or locked data.
Analysis of the structural problem: the complexity of the structural system led to a multilevel approach for the evaluation of the performance: different levels of description of the bridge have been identified in order to evaluate global and local quantities. This purpose is achieved by the decomposition of the structure and its performance. Global performance and quantities of the main structures can be evaluated by global frame 3D-models and proper loads; local stress and strain are evaluated by local shell models. Some local quantities are strictly related to the global response of the bridge and must be evaluated by using the sub-structure model, with both the element topologies. The mathematical models, at every level, allowed the exploration of the intrinsic structural properties of the bridge, the analysis of critical aspects for safety and serviceability, and the dependence of the structural response on different kinds of actions. Particular attention has been paid to the process of validation of the models and methods, which is important to give reliable results. The modelling and analyses have been conducted in the time, following the evolution path of the design of the Messina Strait Bridge, until its last version (2003) a further optimization.
Definition of the design actions: the assessment of the performance of the bridge is related to the environmental and traffic actions. The innovative nature of the bridge, related to several aspects exposed, makes the code statements not adequate. The design specifications state actions and combinations associated to the periods of return for which serviceability, safety and structural integrity must be guaranteed.
Definition of Expected Performance: on the basis of the indications of the Italian Transport Authorities and of the prescriptions of the national codes, where applicable, the minimum expected performance and the requirements concerning safety, serviceability and robustness have been stated. In particular the calibration of the serviceability features has been supported by the multilevel analyses and modelling conducted.
Elaboration of the table of Performance and Synthesis: the multilevel modelling of the structure, of actions and performance have been organized and managed in way that significant load scenarios, at different periods of return, have been analyzed to obtain significant quantities. Concerning serviceability aspects, the complexity of the structure and the great number of quantities to be evaluated require that the output data are organized in a tables, effective and expressive for technical judgement about the feasibility and the availability of the bridge in the scenarios of contingency expected during the service life.

References

1: N.J. Gimsing "Cable Supported Bridges, concept and design", John Wiley & Sons, New York, 1983.
2: K.J. Bathe, "Finite Element Procedures", Prentice Hall
3: CNR 10024/86 "Analisi di strutture mediante elaboratore: impostazione e redazione delle relazioni di calcolo".
4: F. Bontempi, L. Catallo, L. Sgambi "Performance-based design and analysis of the Messina Strait Bridge", Proceedings of ASRANET 2004, Barcelona, Spain, 2004.

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Front Page Browse CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Proceedings ISSN 1759-3433 CCP: 81 PROCEEDINGS OF THE TENTH INTERNATIONAL CONFERENCE ON CIVIL, STRUCTURAL AND ENVIRONMENTAL ENGINEERING COMPUTING Edited by: B.H.V. Topping Paper 7 Multilevel Approaches to the Analysis and Synthesis of the Serviceability Performance of a Long Span Suspension Bridge F. Bontempi+ and F. Giuliano* +Department of Structural and Geotechnical Engineering, University of Rome "La Sapienza", Rome, Italy Department of Structural Mechanics, University of Pavia, Italy doi:10.4203/ccp.81.7 purchase the full-text of this paper Full Bibliographic Reference for this paper F. Bontempi, F. Giuliano, "Multilevel Approaches to the Analysis and Synthesis of the Serviceability Performance of a Long Span Suspension Bridge", in B.H.V. Topping, (Editor), "Proceedings of the Tenth International Conference on Civil, Structural and Environmental Engineering Computing", Civil-Comp Press, Stirlingshire, UK, Paper 7, 2005. doi:10.4203/ccp.81.7 Keywords:* complex systems, performance-based design, suspension bridge, modelling and analysis management, serviceability performance, synthesis. Summary In this paper some activities of modelling and analyses of the structural behaviour of the Messina Strait Bridge are presented. The target of the analyses was the exploration of the superstructure, in terms of safety and serviceability, useful to express an adequate technical judgement about the feasibility and the technical performances of the bridge. The activities conducted have been an useful support for the updating of the design and for the draft of the design specifications. In the paper the critical phases for the assessment of the performance of the bridge are given: Acquisition of data: the activities started from the state of art of the bridge as in its first structural and geometric solution, the basis of the design, statement of fixed or locked data. Analysis of the structural problem: the complexity of the structural system led to a multilevel approach for the evaluation of the performance: different levels of description of the bridge have been identified in order to evaluate global and local quantities. This purpose is achieved by the decomposition of the structure and its performance. Global performance and quantities of the main structures can be evaluated by global frame 3D-models and proper loads; local stress and strain are evaluated by local shell models. Some local quantities are strictly related to the global response of the bridge and must be evaluated by using the sub-structure model, with both the element topologies. The mathematical models, at every level, allowed the exploration of the intrinsic structural properties of the bridge, the analysis of critical aspects for safety and serviceability, and the dependence of the structural response on different kinds of actions. Particular attention has been paid to the process of validation of the models and methods, which is important to give reliable results. The modelling and analyses have been conducted in the time, following the evolution path of the design of the Messina Strait Bridge, until its last version (2003) a further optimization. Definition of the design actions: the assessment of the performance of the bridge is related to the environmental and traffic actions. The innovative nature of the bridge, related to several aspects exposed, makes the code statements not adequate. The design specifications state actions and combinations associated to the periods of return for which serviceability, safety and structural integrity must be guaranteed. Definition of Expected Performance: on the basis of the indications of the Italian Transport Authorities and of the prescriptions of the national codes, where applicable, the minimum expected performance and the requirements concerning safety, serviceability and robustness have been stated. In particular the calibration of the serviceability features has been supported by the multilevel analyses and modelling conducted. Elaboration of the table of Performance and Synthesis: the multilevel modelling of the structure, of actions and performance have been organized and managed in way that significant load scenarios, at different periods of return, have been analyzed to obtain significant quantities. Concerning serviceability aspects, the complexity of the structure and the great number of quantities to be evaluated require that the output data are organized in a tables, effective and expressive for technical judgement about the feasibility and the availability of the bridge in the scenarios of contingency expected during the service life. References 1 N.J. Gimsing "Cable Supported Bridges, concept and design", John Wiley & Sons, New York, 1983. 2 K.J. Bathe, "Finite Element Procedures", Prentice Hall 3 CNR 10024/86 "Analisi di strutture mediante elaboratore: impostazione e redazione delle relazioni di calcolo". 4 F. Bontempi, L. Catallo, L. Sgambi "Performance-based design and analysis of the Messina Strait Bridge", Proceedings of ASRANET 2004, Barcelona, Spain, 2004. purchase the full-text of this paper (price £20) go to the previous paper go to the next paper return to the table of contents return to the book description purchase this book (price £135 +P&P)
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