To maintain the functionality of a building, it is crucial to understand the seismic behavior of its equipment and evaluate its seismic performance accurately. To enhance the precision of seismic performance evaluations, it is necessary to expand the fragility data for building equipment. This study explores a method for developing a fragility function based on the seismic design force specified in design guidelines. Using risk integrals, the study assesses the relationship between acceleration and damage probability, derived from earthquake damage surveys, to calculate the damage risk for building equipment designed and constructed according to Japanese design standards. The fragility function is then derived by analyzing the damage probability when the response acceleration exceeds the design acceleration. Additionally, through a comparative verification with shake table test results from a full-scale 10-story steel office building, the authors confirm the consistency between the derived fragility functions and experimental results. This approach is expected to improve the accuracy of predicting building equipment seismic behavior and provide more reliable seismic performance evaluations.

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