MAXIMIZING THE COLLAPSE RESISTANCE OF COMPOSITE STEEL AND CONCRETE STRUCTURES

MAXIMIZING THE COLLAPSE RESISTANCE OF COMPOSITE STEEL AND CONCRETE STRUCTURES

Papavasileiou, Georgios S.; Charmpis, Dimos C.

Full Article:

The progress of research in combination with the evolution of the available construction technology has allowed the engineers to achieve a more effective use of the material properties, leading this way to the design of more economic, but also more safe structures. At the same time, it enabled the design codes to adjust in order to cover a wider spectrum of dangers, making them stricter in each generation. Various retrofit methods come to add to this lack of capacity of the existing structures; however it is inevitable that the total cost of the existing frame and the retrofit will be higher than the one of a structure designed originally with this capacity. The present work targets to give a perspective of the correlation between cost and performance of steel and concrete composite frame buildings, providing this way a decision making tool to the engineers who want to achieve the most cost effective design of a structure. For this purpose, the design of 3 composite buildings of different height was optimized for a spectrum of seismic performance levels. The minimization of the total material cost was achieved using the evolution strategies genetic algorithm, which was subject to the following constraints: (a) Eurocode 4 provisions for the composite column-members, (b) Eurocode 3 provisions for the steel beam-members (c) minimum targeted top displacement capacity determined by FEMA 440 and (d) the maximum interstorey drift for the life safety performance level. The results obtained show the effectiveness of the optimization method used, since there were determined feasible designs with up to 4 times the required capacity. Of particular interest is the comparison of the results obtained for the different building heights in a diagram of normalized cost versus capacity increase coefficient.

The progress of research in combination with the evolution of the available construction technology has allowed the engineers to achieve a more effective use of the material properties, leading this way to the design of more economic, but also more safe structures. At the same time, it enabled the design codes to adjust in order to cover a wider spectrum of dangers, making them stricter in each generation. Various retrofit methods come to add to this lack of capacity of the existing structures; however it is inevitable that the total cost of the existing frame and the retrofit will be higher than the one of a structure designed originally with this capacity. The present work targets to give a perspective of the correlation between cost and performance of steel and concrete composite frame buildings, providing this way a decision making tool to the engineers who want to achieve the most cost effective design of a structure. For this purpose, the design of 3 composite buildings of different height was optimized for a spectrum of seismic performance levels. The minimization of the total material cost was achieved using the evolution strategies genetic algorithm, which was subject to the following constraints: (a) Eurocode 4 provisions for the composite column-members, (b) Eurocode 3 provisions for the steel beam-members (c) minimum targeted top displacement capacity determined by FEMA 440 and (d) the maximum interstorey drift for the life safety performance level. The results obtained show the effectiveness of the optimization method used, since there were determined feasible designs with up to 4 times the required capacity. Of particular interest is the comparison of the results obtained for the different building heights in a diagram of normalized cost versus capacity increase coefficient.

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DOI: 10.5151/meceng-wccm2012-18752

Referências bibliográficas

• [1] Cheng L., Chan C.M., “Optimal lateral stiffness design of composite steel and concrete tall frameworks”, Engineering Structures, Elsevier, 2009
• [2] Comité Européen de Normalisation (CEN), “Eurocode 0: Basis of structural design”, CEN Publications, Brussels, Belgium, 2003
• [3] Comité Européen de Normalisation (CEN), “Eurocode 1: Basis of design and actions on structures (ENV 1991)”, CEN Publications, Brussels, Belgium, 2003
• [4] Comité Européen de Normalisation (CEN), “Eurocode 3: Design of steel structures (ENV 1993)’ Part 1-1/1992 General rules and rules for buildings”, CEN Publications, Brussels, Belgium, 2003
• [5] Comité Européen de Normalisation (CEN), “Eurocode 4: Design of composite structures (ENV 1994)’ Part 1-1/1992 General rules and rules for buildings”, CEN Publications, Brussels, Belgium, 2003
• [6] Comité Européen de Normalisation (CEN), “Eurocode 8: Design provisions for earthquake resistance of structures (ENV 1998)’ Part 1-1/1994 General rules - Seismic action and general requirements for structures.”, CEN Publications, Brussels, Belgium, 2003
• [7] FEMA-440, “Improvement of nonlinear static seismic analysis procedures (FEMA 440)”, Federal Emergency Management Agency, Washington D.C., 2005
• [8] Fradiadakis M., Lagaros N.D., Papadrakakis M. “Performance based earthquake engineering using structural optimization tools”, International Journal of Reliability and Safety, 2006
• [9] Fradiadakis M., Papadrakakis M. “Performance based optimum seismic design of reinforced concrete structures”, Earthquake Engineering and Structural Dynamics, 2008
• [10] Papavasileiou G.S., Charmpis D.C., Lagaros N.D., “Optimized seismic retrofit of steelconcrete composite frames”, Proceedings of the 3rd ECCOMAS Thematic Conference on Computational Methods in Structural Dynamics and Earthquake Engineering, 4573- 4586, Corfu, Greece, 2011
• [11] Spacone E., El-Tawil S., “Nonlinear Analysis of Steel-Concrete Composite Structures: State of Art”, Journal of Structural Engineering, Vol. 130, No. 2, 159-168, A.S.C.E., 2004

Como citar:

Papavasileiou, Georgios S.; Charmpis, Dimos C.; "MAXIMIZING THE COLLAPSE RESISTANCE OF COMPOSITE STEEL AND CONCRETE STRUCTURES", p-2231-2242. In: In Proceedings of the 10th World Congress on Computational Mechanics [= Blucher Mechanical Engineering Proceedings, v. 1, n. 1]. São Paulo: Blucher, 2014.
ISSN 23580828, DOI 10.5151/meceng-wccm2012-18752