TY - JOUR
T1 - New energy based approach to predict seismic demands of steel moment resisting frames subjected to near-fault ground motions
AU - Enderami, Seyyed Amin
AU - Beheshti-Aval, Seyed Bahram
AU - Saadeghvaziri, Mohamad Ala
PY - 2014/8/1
Y1 - 2014/8/1
N2 - This article proposes a new energy-based approach for predicting seismic demands of steel structures at the near-fault sites by introducing the concept of dissipated hysteretic input energy during largest yield excursion (δ. Eh). It is defined as the amount of hysteretic energy demand imposed on a structure over a finite time interval between two zero-crossing of bow system velocity. The proposed energy measure, which is dependent both on the characteristics of ground motions and structural system, is shown to be well correlated to the maximum inelastic displacement. In order to estimate the maximum global displacement of a MDOF system to near-fault ground motions, a new procedure is proposed. The steps of proposed methodology are quite similar to those of the Modified Modal Pushover Analysis (MMPA) method. The determination of the peak global displacement demand, however, is based on a different concept. In contrast to other energy-based procedures, this displacement is an actual value equalizing δ. Eh to static monotonic hysteretic energy. Finally, the accuracy of the method was evaluated when response values were compared to the results from nonlinear dynamic analysis. There are good correlations between results of these two methods. Indeed more accurate results in capturing seismic demands of typical steel moment resisting frames subjected to near-fault ground motions in comparison with the procedure proposed in ASCE 41-06 are achieved.
AB - This article proposes a new energy-based approach for predicting seismic demands of steel structures at the near-fault sites by introducing the concept of dissipated hysteretic input energy during largest yield excursion (δ. Eh). It is defined as the amount of hysteretic energy demand imposed on a structure over a finite time interval between two zero-crossing of bow system velocity. The proposed energy measure, which is dependent both on the characteristics of ground motions and structural system, is shown to be well correlated to the maximum inelastic displacement. In order to estimate the maximum global displacement of a MDOF system to near-fault ground motions, a new procedure is proposed. The steps of proposed methodology are quite similar to those of the Modified Modal Pushover Analysis (MMPA) method. The determination of the peak global displacement demand, however, is based on a different concept. In contrast to other energy-based procedures, this displacement is an actual value equalizing δ. Eh to static monotonic hysteretic energy. Finally, the accuracy of the method was evaluated when response values were compared to the results from nonlinear dynamic analysis. There are good correlations between results of these two methods. Indeed more accurate results in capturing seismic demands of typical steel moment resisting frames subjected to near-fault ground motions in comparison with the procedure proposed in ASCE 41-06 are achieved.
KW - Dissipated hysteretic energy
KW - Energy based method
KW - Near-fault
KW - Nonlinear static analysis
KW - Steel moment resisting frame
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U2 - 10.1016/j.engstruct.2014.04.029
DO - 10.1016/j.engstruct.2014.04.029
M3 - Article
AN - SCOPUS:84900819463
SN - 0141-0296
VL - 72
SP - 182
EP - 192
JO - Engineering Structures
JF - Engineering Structures
ER -