Numerical modelling of the seismic behaviour of a 7-story building: NEES benchmark
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The American NEES Consortium Inc. (NEESinc) has performed a seismic research project around an uniaxial shaking table test on a structure representing a full-scale vertical slice of a 7-story reinforced concrete wall building. This paper deals with the numerical strategy adopted in the laboratory 3S-R for a “blind” simulation of the non linear behaviour of the specimen. Multifiber Timoshenko beam elements are used for the finite element mesh of the reinforced concrete walls. Constitutive models are based on damage mechanics for concrete and plasticity for steel. It is shown that the proposed modelling strategy describes accurately the global behaviour of the structure (even though the prediction is “blind”). Then, comparison with the experimental results helps to identify the deficiencies of the original numerical model and to propose remedies in order to improve its performance. Based on the results obtained it appears possible to use this approach to investigate numerically the behaviour of a wider variety of configurations that is practically impossible to study experimentally.
KeywordsShaking table Timoshenko beam Multifiber Concrete Building
The authors are grateful for the financial support of the European Contract LESSLOSS, Risk Mitigation for Earthquakes and Landslides of the Sixth Framework Program (Project No.: GOCE-CT-2003-505488). They would like to thank the organizers of the seven-story building-slice earthquake “blind” prediction contest for their financial support that made possible for the 3S-R group to participate to the NEES/UCSD Workshop and Seminar “Analytical Model of Reinforced Concrete Walls” held in San Diego the 15th and 16th of December 2006.
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