Probabilistic Seismic Loss Assessment of a Vancouver High-Rise Building
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11-04-2010, 10:53 AM


Abstract:
A seismic loss curve of a real-world building is obtained by means of state-of-the-art models for the impending ground motion, the structure, the damage of structural and nonstructural components, and the ensuing losses. In particular, the seismic hazard at the buildingâ„¢s location _Vancouver, Canada_ is described by a comprehensive probabilistic model. It is argued that this ground motion model is particularly appropriate in reliability analysis compared with the more common utilization of a limited set of scaled ground motions. In this paper the probabilistic integrals are carried out by means of a reliability formulation, in which a series of probabilistic models enter. This is referred to as unified reliability analysis to contrast the unified format of the probabilistic models with alternatives, such as suites of ground motions and fragility curves that themselves are created by reliability analysis. A key contribution in this paper is the comprehensive numerical example, which entails an inelastic dynamic analysis of a finite-element model of a building located in Vancouver.


Presented By:
S. D. Koduru and T. Haukaas



Introduction
The majority of high-rise buildings in Vancouver, Canada are constructed with RC and designed with shear-wall systems to resist lateral seismic forces. The behavioral characteristics of these structures are dependent on the earthquake ground motions and vary for the different types of earthquakes that are possible in the Vancouver region. For a comprehensive assessment of seismic risk, the probable damage and loss suffered by high-rise RC structures under each distinct type of earthquake must be evaluated. The primary objective in this paper is to evaluate the loss of a high-rise RC structure in a probabilistic manner while accounting for different types of earthquakes generated in the Cascadia subduction zone. The high-rise buildings, following the existing building codes, are designed to ensure life safety in a seismic event and provide safety against building collapse for a specific design intensity. The structures are designed to dissipate energy by undergoing inelastic deformations at controlled locations, such as plastic hinge zones. However, the damage suffered by the structure and the consequent monetary loss due to repair costs, loss of occupancy, and depreciation of value may be of significant concern to the owners, occupants, and other stakeholders in the buildings. Hence, the evaluation of monetary loss due to the damage of structural and nonstructural elements is a key ingredient in the performance assessment of these structures.

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