Damage detection in a precast structure subjected to an earthquake: A numerical approach (original) (raw)
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A note on predetermined earthquake damage scenarios for structural health monitoring
Structural Control and Health Monitoring, 2011
It is shown that the damage scenarios for site-specific building models, responding in highly nonlinear manner to strong earthquake ground-motion pulses, can be used in real-time health-monitoring systems. When it can be shown that such predictions produce robust results and are not sensitive to the details of the complete time history of strong ground motion, the predetermined earthquake damage scenarios (PEDS) method can produce reliable predictions of the location(s) and the degree(s) of structural damage in essentially real time. It is shown that for a full-scale building, damaged during the 1994 Northridge earthquake in California, PEDS based on one-dimensional wave propagation in the layered building model would have produced accurate and realistic predictions of damage. In contrast to the vibrational health-monitoring methods that track changes in the frequency and stiffness of the characteristic functions, PEDS methods provide invaluable information for spatial and temporal identification of damage. Copyright © 2011 John Wiley & Sons, Ltd.
2016
The demand of a widespread health monitoring of strategic buildings in seismic areas has emphasized the need to realize studies in order to verify the feasibility of economic and fast procedures to detect anomalous vibrations on a large number of buildings, to perform post earthquake monitoring and to define first damage scenarios. Structural health monitoring systems are usually realized with a large number of sensors, suitably distributed on the structure, often involving complex elaborations of big amounts of data. When applied on a large number of buildings these systems can hardly result to be realizable for the necessary long time and the high cost to extract useful information. Within the Italian research RELUIS project, funded by the Italian Department of Civil Protection, a specific task deals with the possibility of applying a fast procedure to determine the damage evolution on a large number of structures after seismic events. The method developed and presented in this pa...
Quantifying the value of seismic structural health monitoring of buildings
2016
The decision to adopt a monitoring system for a structure should be based on sound appraisal of the expected economic benefits of such decisions. These benefits can be quantified in terms of the reduction of the risks posed by the failure of the structure versus the cost of monitoring. This paper discusses a framework for rationalising the adoption of monitoring for buildings subjected to seismic risks. The approach adopted is that of the pre-posterior decision analysis. Methods for automatic damage detection and joint utilisation of monitoring and visual inspection data are considered from a point of view of how they can be used in the pre-posterior analysis. Two short numerical examples are included to illustrate the proposed conceptual developments.
Health monitoring of an instrumented SRMF building using earthquake data
The Structural Design of Tall and Special Buildings, 2013
SUMMARYThis paper is a study of a six‐story welded steel moment‐resisting frame instrumented by California Strong Motion Instrumentation Program. Several earthquakes had shaken the building, and its response of strong motion data recorded during the earthquakes were made available. In particular, the Whittier Narrows (October 1987), Sierra Madre (June 1991), Northridge (January 1994) and Chino Hills (July 2008) earthquakes were considered in the studies reported here.The paper investigates the capability of input–output system identification methods, namely eigensystem realization algorithm with data correlation, and observer Kalman filter identification, in identifying dynamic characteristics of typical office building structures subjected to strong ground motion. It explores the possibility to extend the above system identification procedures to near‐real‐time estimation of the building response under future earthquakes in order to estimate the likelihood of brittle damage in weld...
Assessment of seismic performance of structures by health monitoring
Proceedings of the New Zealand Society for Earthquake Engineering Annual Conference 2007, Palmerston North, New Zealand, March 30 – April 1, 2007, pp. 1-7, doi: 10.13140/2.1.4183.2009, 2007
The performance of existing structures can be assessed in real-time using Structural Health Monitoring (SHM). In this study, a SHM method is proposed and experimentally tested on a 3-storey laboratory structure mounted on a shake-table. Several damage conditions were simulated in the structure by a reduction in lateral stiffness. Typical stiffness reductions were between 7% - 10%. The structure was excited using a series of earthquake records. Examination of the acceleration time histories, using time series analysis and pattern recognition, enabled accurate detection, location and quantification of damage.