Building design based on energy dissipation: a critical assessment |
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Authors: | Chara Ch Mitropoulou Nikos D Lagaros Manolis Papadrakakis |
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Institution: | (1) Institute of Structural Analysis and Seismic Research, National Technical University Athens, Zografou Campus, Athens, 157 80, Greece |
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Abstract: | The basic objective of this study is the assessment of the European seismic design codes and in particular of EC2 and EC8
with respect to the recommended behaviour factor q. The assessment is performed on two reinforced concrete multi-storey buildings, having symmetrical and non-symmetrical plan
view respectively, which were optimally designed under four different values of the behaviour factor. In the mathematical
formulation of the optimization problem the initial construction cost is considered as the objective function to be minimized
while the cross sections and steel reinforcement of the beams and the columns constitute the design variables. The provisions
of Eurocodes 2 and 8 are imposed as constraints to the optimization problem. Life-cycle cost analysis, in conjunction with
structural optimization, is believed to be a reliable procedure for assessing the performance of structures during their life
time. The two most important findings that can be deduced are summarized as follows: (1) The proposed Eurocode behaviour factor
does not lead to a more economical design with respect to the total life-cycle cost compared to other values of q (q = 1, 2). (2) The differences of the total life-cycle cost values may be substantially greater than those observed for the
initial construction cost for four different q (q = 1, 2, 3, 4). |
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