Response sensitivities for an elastoplastic model specifically developed for buckling-restrained braces (BRBs) and recently implemented in OpenSees, are used as a tool for model updating of steel frames with BRBs. The response and response sensitivities were derived and validated in an earlier study and used to investigate the influence of the BRB constitutive parameters on the structural response under seismic excitations. The inverse problem, i.e. identification of the BRB constitutive parameters from the global structural dynamic response, here illustrated is solved using a sequential quadratic programming algorithm for large-scale constrained optimization. Convergence rates and differences between target and identified values are discussed for a steel frame where BRBs are the only seismic-resistant components. The discussion includes a comparisons between consistent sensitivities obtained through the direct differentiation method as implemented in OpenSees and their approximated values as obtained from the finite difference method.

Sensitivity-based model updating of steel frames with BRBs in OpenSees

ZONA, Alessandro;DALL'ASTA, Andrea
2015-01-01

Abstract

Response sensitivities for an elastoplastic model specifically developed for buckling-restrained braces (BRBs) and recently implemented in OpenSees, are used as a tool for model updating of steel frames with BRBs. The response and response sensitivities were derived and validated in an earlier study and used to investigate the influence of the BRB constitutive parameters on the structural response under seismic excitations. The inverse problem, i.e. identification of the BRB constitutive parameters from the global structural dynamic response, here illustrated is solved using a sequential quadratic programming algorithm for large-scale constrained optimization. Convergence rates and differences between target and identified values are discussed for a steel frame where BRBs are the only seismic-resistant components. The discussion includes a comparisons between consistent sensitivities obtained through the direct differentiation method as implemented in OpenSees and their approximated values as obtained from the finite difference method.
2015
9788898720088
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11581/384981
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