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Projects : CUREE-Kajima Joint Research Program
PHASE V RESEARCH REPORT

CKV-01: Real-Time Loss Estimation For Instrumented Buildings

K.A. Porter, J.L. Beck, J.Y. Ching, and J. Mitrani-Reiser (California Institute of Technology)

M. Miyamura, A. Kusaka, T. Kudo, K. Ikkatai, and Y. Hyodo (Kajima Corp.)

A growing number of buildings have been instrumented to measure and record earthquake motions and to transmit these records to seismic-network data centers to be archived and disseminated for research purposes. At the same time, sensors are growing smaller, less expensive to install, and capable of sensing and transmitting other environmental parameters in addition to acceleration. Finally, recently developed performance-based earthquake engineering methodologies employ structural-response information to estimate probabilistic repair costs, repair durations, and other metrics of seismic performance. The opportunity presents itself therefore to combine these developments into the capability to estimate automatically in near-real-time the probabilistic seismic performance of an instrumented building, shortly after the cessation of strong motion. We refer to this opportunity as (near-) real-time loss estimation (RTLE).

This report presents a methodology for RTLE for instrumented buildings. Seismic performance is to be measured in terms of probabilistic repair cost, precise location of likely physical damage, operability, and life-safety. The methodology uses the instrument recordings and a Bayesian state-estimation algorithm called a particle filter to estimate the probabilistic structural response of the system, in terms of member forces and deformations. The structural response estimate is then used as input to component fragility functions to estimate the probabilistic damage state of structural and nonstructural components. The probabilistic damage state can be used to direct structural engineers to likely locations of physical damage, even if they are concealed behind architectural finishes. The damage state is used with construction cost-estimation principles to estimate probabilistic repair cost. It is also used as input to a quantified, fuzzy-set version of the FEMA-356 performance-level descriptions to estimate probabilistic safety and operability levels.

CONTENTS

Chapter 1: INTRODUCTION

- Background
- Project Objectives
- Organization of Report
- Acknowledgements

Chapter 2: LITERATURE REVIEW

- Near-Real-Time Ground Motion Information
- Structural Health Monitoring
- Economic Performance Evaluation
- Safety and Post-Earthquake Operability

Chapter 3: METHODOLOGY

- Methodology Overview
- Define the Facility
- Estimate Engineering Demands (Structural Analysis)
- Estimate Assembly Damage (Damage Analysis)
- Estimate Post-Earthquake Performance Level
- Estimate Repair Cost (Loss Analysis)

Chapter 4: CUREE SAMPLE APPLICATION

- Facility Definition
- Instrumentation, Historic Shaking, and Damage
- Structural Response Model
- Damage and Repair-Cost Model
- Hindcast of Damage, System Performance, and Loss

Chapter 5: KAJIMA SAMPLE APPLICATION

- Outline of Demonstration
- Facility Definition
- Seismic Response Analysis
- Application of Particle Filter
- Discussion

Chapter 6: CONCLUSIONS AND FUTURE DIRECTIONS

Chapter 7: REFERENCES CITED

Appendix A: Ching et al. (2004)

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CKV-01 PDF 2.7 MB


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Consortium of Universities for Research in Earthquake Engineering
last updated 02.20.15