Introducing a response-based duration metric and its correlation with structural damages

TL;DR

This paper introduces a new response-based duration metric for structures during earthquakes, demonstrating improved correlation with structural damage compared to existing metrics through spectral matching and analysis of concrete building models.

Contribution

The study presents a novel response-based duration measure that enhances correlation with structural damage, outperforming existing metrics by 15-20%.

Findings

Proposed duration metric correlates better with structural response.

Spectral matching reduces influence of amplitude and frequency variability.

Improved correlation by 15-20% over existing metrics.

Abstract

This study proposes a response-based parameter for strong motion duration which is computed for structures and is the total time they are nonlinear during an earthquake. Correlation between structural response and duration for structures, subjected to a set of spectrum matched ground motions, is employed to examine the efficiency of the proposed method. The spectral matching procedure ensures that the influence of amplitude and frequency content of motions on structural response variability is significantly removed. Four concrete building type systems are studied and correlation coefficients of structural response with the proposed duration definition are examined. Comparison of the proposed method with other existing definitions, the record-based and response-based metrics, shows about 15-20% improvement in the correlation values.