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Nonlinear Seismic Response of Steel Concentrically Braced Frames Using endurance time analysis Method

Journal of Civil Engineering and Architecture 2011年第9期5卷 847-855页

作者： Mohammad Amin Hariri Ardebili Yashar Zarringhalam Masoud Mirtaheri Mahmood Yahyai Department of Civil Engineering K. N. Toosi University of Technology Tehran Iran

In present paper application of endurance time analysis （ETA） method in nonlinear seismic assessment of steel concentrically braced frames is studied. In this method structure is subjected to a set of predesigned increasing acceleration functions and various responses of the structure are recorded during synthetic seismic excitation. The averages of maximum values for various responses in Nonlinear time-History Analyses （NTHA） extracted from real ground motions are expected to be close to those obtained from ETA up to equivalent target time. For this purpose a set of 9, 11, 13 and 15 stories steel frames were designed and plastic hinge method was selected as source of nonlinearity in all cases. Responses were compared based on interstory drift ratio and story shear in two methods and results show satisfactory consistency between two methods. Finally, it was concluded that the ETA method can be used as alternative method in nonlinear seismic analysis of concentrically braced steel frames.

关键词： endurance time analysis concentrically braced frames nonlinear seismic assessment.

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Estimation of Concrete Arch Dams Responses in Linear Domain Using endurance time analysis Method

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Journal of Civil Engineering and Architecture 2011年第8期5卷 754-758页

作者： Mohammad Amin Hariri Ardebili Hasan Mirzabozorg Department of Civil Engineering K. N. Toosi University of Technology Tehran Iran

In this paper, endurance time analysis （ETA） method which is a new time-history based dynamic pushover procedure is introduced and its application in linear analysis of concrete arch dams is investigated. In this method the structure is subjected to gradually intensifying acceleration functions and its performance is evaluated based on the length of the time duration that can satisfy required performance criteria. For this purpose Dez arch dam is selected as case study, fluid-structure interaction is taken into account and F.E. model of the system is excited in three performance levels. ETA method gives an approximation of maximum response at the equivalent target time, resulted from analyzing the system based on natural records. Extracted results are displacement, velocity and acceleration of the crest at crown cantilever. Results show using of ETA method can reduce at least 50% in number of analyses and 70% in total time of analyses at the current case. Furthermore, it is found that although the results of the ETA are not exactly consistent with the results of time-history analyses using real ground motions, errors are reasonable and ETA can identify performance levels of the dam with acceptable accuracy.

关键词： endurance time analysis linear response arch dam seismic performance.

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Generation of endurance time excitation functions using spectral representation method

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Earthquake Engineering and Engineering Vibration 2023年第2期22卷 441-452页

作者： Parsa Parvanehro Mohammad Safi Faculty of Civil Water and Environmental EngineeringShahid Beheshti UniversityTehran ***Iran

In this study,application of the spectral representation method for generation of endurance time excitation functions is *** this method,the intensifying acceleration time series is generated so that its acceleration response spectrum in any desired time duration is compatible with a time-scaled predefined acceleration response *** this purpose,simulated stationary acceleration time series is multiplied by the time dependent linear modulation function,then using a simple iterative scheme,it is forced to match a target acceleration response *** is shown that the generated samples have excellent conformity in low frequency,which is useful for nonlinear endurance time *** the second part of this study,it is shown that this procedure can be extended to generate a set of spatially correlated endurance time excitation *** makes it possible to assess the performance of long structures under multi-support seismic excitation using endurance time analysis.

关键词： endurance time analysis endurance time excitation functions spatial variation of seismic ground motions multi-support excitation spectral representation method

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