Multi-damping Spectral Matching for the Seismic Analysis of Nuclear Power Plant Structures Based on Windowed Adjustment Function

摘要

The latest design response spectrum requires a better preservation technique in phase angles and avoidance of any shift in matched time history. This research presents an improved iterative spectral matching method in the time domain for generating acceleration time series compatible with the target design spectrum. The spectral matching is achieved for several standard frequencies and damping value simultaneously. The proposed method suggests an iterative technique via implementing windowed displacement impulse function for correcting the input acceleration time series to match the design spectrum for every frequency and damping values. Additional enhancement is carried out by applying a scale factor to achieve the spectral matching with accuracy and convergence enhancements. With an improved coherence in phase angles the effect of windowing on the adjustment function proves that the proposed method is effective over previous techniques in reducing the distortion of matched ground motions.