Effects of ground motion duration on the seismic damage to and collapse capacity of a mid-rise woodframe building

摘要

This paper studies the seismic performance of a six-story mid-rise woodframe building under long duration ground motions. The prototype structure was designed by using a performance-based seismic design (PBSD) approach and tested on a shake table at full-scale as part of the NEESWood Project. A three-dimensional finite element model of the structure was developed using the Timber3D program and validated using the shake table test data. Two sets of short and long duration records that had approximately the same response spectra were used for nonlinear dynamic analyses. Fragility curves developed by incremental dynamic analysis (IDA) showed the median collapse capacity of the structure was reduced by 18% for long duration motions compared to the capacity for short duration motions. At the maximum considered earthquake (MCE) intensity level, the estimated median Park and Ang damage index of the structure for long duration motions was increased by 36%.