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Endurance Time (ET) method is a dynamic structural analysis procedure in which intensifying dynamic excitation is used as the loading function. In ET method, an estimate of structural response at the entire seismic intensity range of interest can be obtained in a single response history analysis.

The Concept of Endurance Time method
Endurance Time (ET) method is a dynamic structural analysis procedure in which intensifying dynamic excitation is used as the loading function. In this way, an estimate of structural response and/or performance at the entire seismic intensity range of interest can be obtained in a single response history analysis. The concept of Endurance Time analysis is similar to the Exercise Test applied in medicine. Similar concept has also been extended to applications in the analysis of offshore platforms under water waves.

Development History
The basic concepts of the Endurance Time method were published in 2004. Application in linear seismic analysis appeared in 2007. ET was subsequently extended to nonlinear analysis of single degree of freedom (SDOF) and multi degree of freedom systems. Procedures for multi-component seismic analysis were subsiquently developed.