Development of vulnerability surface of high-rise RC frame by means of IDA

Chao Xu, Zengping Wen, & Junju Xie

Published July 29, 2019, SCEC Contribution #9286, 2019 SCEC Annual Meeting Poster #292 (PDF)

The damage potential of strong ground motion is commonly presented by an intensity measure (IM) in vulnerability evaluation of building structures. For high-rise buildings, scalar-valued intensity measures usually hard to characterize the engineering properties and damage potential of strong ground motion. In this study, different alternative vector-valued IMs comprised of two ground motion parameters were used to present the ground motion potential. For all the vector-valued IMs, spectral acceleration at fundamental period of the structure is selected as the first parameter. As the second parameter of the vectors, peak ground acceleration, peak ground velocity and spectral shape parameters were considered. Probabilistic seismic demand analysis of an eleven-story RC frame structure was conducted by means of incremental dynamic analysis, using maximum inter-story drift ratio as the engineering demand parameters. The efficiency of different vector-valued IMs was compared by means of regression and residual analysis. Then vector-valued IM based vulnerability surfaces revealing the relationship between the structural damage probability and two different ground motion parameters were developed. It is shown that the spectral shape and peak velocity also significantly affect the structural seismic response in addition to spectral acceleration at fundamental period of the structure. The residual of structural seismic demand can be significantly reduced by using vector-valued IMs comparing with scalar IMs, especially for high ground motion intensity levels. As a result of using more efficient vector-valued IMs in vulnerability analysis, the number of nonlinear dynamic analysis and the limitations of ground motion selection can be greatly reduced. Compared to scalar IM based vulnerability curves, vulnerability surfaces characterized by two ground motion parameters are more informative, which can reveal the impact of different ground motion parameters on structural response and damage probability.

Key Words
vulnerability surface, strong ground motion, vector-valued intensity measure, efficiency, incremental dynamic analysis

Citation
Xu, C., Wen, Z., & Xie, J. (2019, 07). Development of vulnerability surface of high-rise RC frame by means of IDA. Poster Presentation at 2019 SCEC Annual Meeting.

Related Projects & Working Groups
Earthquake Engineering Implementation Interface (EEII)