Vulnerability assessment of concrete buildings with different heights to near-source earthquakes using improved performance criteria

Abstract eng:
An inclusive loss estimation system for a region incorporates the vulnerability relationships of the structures exposed to earthquake risk with the description of earthquake hazard and the inventory of the built environment. The careful definition of performance criteria under earthquake loads is crucial for deriving reliable vulnerability relationships. The performance limit states of concrete buildings are described in the present study at both the structure and the member levels, including the assessment of brittle shear failure modes. Several performance indicators along with a number of experimentally verified shear prediction models that account for the changes in shear supply with the degradation of concrete strength and the fluctuation of axial force under earthquake loading are thus implemented in a post-processor to monitor the seismic response of concrete buildings. A range of reference structures is selected to represent code-conforming medium-rise and high-rise shear wall buildings with different heights. Fiber-based simulation models and a diverse set of earthquake records representing a near-field seismic scenario are used to carry out a large number of incremental dynamic analyses under different combinations of horizontal and vertical components of ground motions. The results of this study illustrate the significance of adopting improved performance criteria, including the reliable prediction of shear failure modes, and multi-axial ground motions on the seismic vulnerability of concrete buildings, particularly low to mid-rise shear wall structures. The outcomes of this systematic study are versatile vulnerability relationships that contribute in the development of a broad loss estimation system for multistory concrete buildings.

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