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Probabilistic assessment of ground motion rotation impact on seismic performance of structures
Highlights The fragility functions of two MRF steel benchmark buildings are developed using 90 ground motions, each of which is rotated to 10 angles. The impact of ground motion rotation on fragility function characteristics are studied, and the fragility functions derived from the Cloud Analysis and Modified Cloud Analysis are compared. Two types of target fragility functions are suggested and a robust method for comparing fragility functions are proposed. The impact of sample size on acquisition of the reliable fragility functions are elaborated. A method is proposed which shows a great potential to incorporate the impact of record rotation on the fragility functions.
Abstract In the common application of ground motions in seismic design and assessment, it is mainly inclined to leverage merely as-recorded components. However, the as-recorded data is restricted by the recording sensor orientations, implicitly neglecting other potential vectors, which can be readily calculated using a rotation matrix. Meanwhile, there exists a debate on the extent of the importance of such consideration on various aspects of seismic assessment outcomes. This study, using a measure of entropy, shows why and how rotating the ground motions matter, and to what extent the rotation can alter the structural seismic assessment results probabilistically, in the context of performance-based earthquake engineering. In this regard, two benchmark structures are analyzed and the sensitivity of their seismic behavior to the records' rotation is demonstrated using Sa(T1) and Maximum Inter-story Drift Ratio as the pair measures. It is revealed that the precise estimation of fragility functions is affected by the number of angles, unachievable using moderate ground motion sets at solely as-recorded angles. Fragility functions are developed through Cloud Analysis, and the impact of sample size and ground motion rotation on them is studied. Also, a simple yet versatile procedure is proposed to incorporate the mentioned impact in a cost-saving manner. In this regard, Sa,RotD50, which is a well-known seismological measure, is proven to contribute to the incorporation of waveform angular effects adequately. The proposed method is assessed in terms of its estimation precision in comparison with other single random angles probabilistically.
Probabilistic assessment of ground motion rotation impact on seismic performance of structures
Highlights The fragility functions of two MRF steel benchmark buildings are developed using 90 ground motions, each of which is rotated to 10 angles. The impact of ground motion rotation on fragility function characteristics are studied, and the fragility functions derived from the Cloud Analysis and Modified Cloud Analysis are compared. Two types of target fragility functions are suggested and a robust method for comparing fragility functions are proposed. The impact of sample size on acquisition of the reliable fragility functions are elaborated. A method is proposed which shows a great potential to incorporate the impact of record rotation on the fragility functions.
Abstract In the common application of ground motions in seismic design and assessment, it is mainly inclined to leverage merely as-recorded components. However, the as-recorded data is restricted by the recording sensor orientations, implicitly neglecting other potential vectors, which can be readily calculated using a rotation matrix. Meanwhile, there exists a debate on the extent of the importance of such consideration on various aspects of seismic assessment outcomes. This study, using a measure of entropy, shows why and how rotating the ground motions matter, and to what extent the rotation can alter the structural seismic assessment results probabilistically, in the context of performance-based earthquake engineering. In this regard, two benchmark structures are analyzed and the sensitivity of their seismic behavior to the records' rotation is demonstrated using Sa(T1) and Maximum Inter-story Drift Ratio as the pair measures. It is revealed that the precise estimation of fragility functions is affected by the number of angles, unachievable using moderate ground motion sets at solely as-recorded angles. Fragility functions are developed through Cloud Analysis, and the impact of sample size and ground motion rotation on them is studied. Also, a simple yet versatile procedure is proposed to incorporate the mentioned impact in a cost-saving manner. In this regard, Sa,RotD50, which is a well-known seismological measure, is proven to contribute to the incorporation of waveform angular effects adequately. The proposed method is assessed in terms of its estimation precision in comparison with other single random angles probabilistically.
Probabilistic assessment of ground motion rotation impact on seismic performance of structures
Shargh, Ghasem Boshrouei (author) / Barati, Reza (author)
Engineering Structures ; 292
2023-05-26
Article (Journal)
Electronic Resource
English
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