System reliability models for bridge structures

• Autorzy: Nowak A. S.
• Języki publikacji: EN

Abstrakty

EN

There is a growing need for a more accurate assessment of the load carrying capacity of highway bridges. The traditional approach is based on consideration of individual components rather than structures. Consequently, the acceptance criteria are formulated in terms of the allowable stress, or ultimate moment, in a component. However, it has been observed that the load carrying capacity of the whole structure (system) is often much larger than what is determined by the design of components. The difference can be attributed to the system behaviour. Quantification of this difference is the subject of the system reliability. There is a need to take advantage of the available system reliability methods and advanced structural analysis methods and apply them in the design of bridges and evaluation of existing structures. The current advanced analytical procedures allow for a numerically accurate but deterministic analysis of strain/stress in a bridge. Mathematical procedures exist for the calculation of reliability for various idealized systems: parallel, series, and combinations. There are also new developments in material" technology, and field testing which can be used to improve bridge design and evaluation. This paper deals with calculation of the reliability of the whole bridge structure, taking into account realistic boundary conditions, and site-specific load and resistance parameters.

Słowa kluczowe

EN

system reliability models; bridge structures

• Wydawca: Polska Akademia Nauk, Wydział IV Nauk Technicznych
• Czasopismo: Bulletin of the Polish Academy of Sciences. Technical Sciences
• Rocznik: 2004
• Tom: Vol. 52, nr 4
• Strony: 321--328
• Opis fizyczny: Bibliogr. 14 poz., 10 rys.

Twórcy

autor

Nowak A. S.

• University of Nebraska, Lincoln, NE 68588-0531, USA

Bibliografia

• [1] G. Konig and A. S. Nowak, (ed.), Bridge Rehabilitation, Ernst & Sohn, Berlin, Germany, 1992.
• [2] V. Saraf and A. S. Nowak A.S., “Proof load testing of deteriorated steel girder bridges”, ASCE Journal of Bridge Engineering 3(2), 82–89 (May 1998).
• [3] V. Saraf, A. F. Sokolik and A. S. Nowak, “Proof load testing of highway bridges”, Transportation Research Record 1541, 51–57 (1997).
• [4] M. Ghosn and F. Moses, “Redundancy in highway bridge superstructures” in: NCHRP Report 406. Transportation Research Board, Washington, D.C., 1998.
• [5] AASHTO LRFD Bridge Design Specifications, Washington, D.C., 2004.
• [6] CHBDC, Canadian Highway Bridge Design Code, Canadian Standard Association, Toronto, 2003.
• [7] ENV 1991–3 Eurocode 1: Basis of Design and Actions on Structures. Part 3: Traffic Loads on Bridges. Final draft – August 1994.
• [8] C. D. Eamon and A. S. Nowak, “Effectsof edge-stiffening elements and diaphragms on bridge resistance and load distribution”, ASCE Journal of Bridge Engineering 7(5), 258–266 (September/October 2002).
• [9] A. S. Nowak and M. Kaszynska, “Target safety levels for design and evaluation of bridges”, Transactions of Joining and Welding Research Institute 32(1), 189–196 (2003).
• [10] A. S. Nowak and K. R. Collins, Reliability of Structures, pp. 184–195; 302–311, McGraw Hill, Boston, 2000.
• [11] R. Rackwitz and B. Fiessler, “Structural reliability under combined random load sequences”, Computer and Structures 9, 489–494 (1978).
• [12] A. S. Nowak, Calibration of LRFD Bridge Design Code, NCHRP Report 368. Washington, D.C., 1999.
• [13] S.-J. Kim and A. S. Nowak, “Load distribution and impact factorsfor I-girder bridges”, ASCE Journal of Bridge Engineering 2(3), 97–104 (August 1997).
• [14] J. Eom and A. S. Nowak, “Live load distribution for steel girder bridges”, ASCE Journal of Bridge Engineering 6(6), 489–497 (2001).