Civil Engineering Association

A performance-based design approach for retrofitting regular building frames with steel braces against sudden column loss

Progressive collapse resistance of existing building structures against sudden column loss may be increased
with adequate supply of steel braces. A performance-based design approach for retrofitting regular building
frames with steel braces is proposed in this study. The retrofit design approach is developed from the pseudostatic
response analysis of an idealized elastic–plastic, single degree-of-freedom system. Analytical relationship
between the increment of collapse resistance and structural characteristics is derived to determine the design
strength and stiffness of added braces. Accuracy of the proposed approach is verified with incremental dynamic
analysis. Also, its application to multi-story buildings is demonstrated with three frame models. Conservative
performance is obtained with the design approach, especially for a larger resistance increment. An iterative
modification technique is suggested to refine the retrofit design and only a few nonlinear static iterations are
required for convergence. Nonlinear dynamic analysis results indicate that the column-loss response of the
braced frames is approximated to the performance target and thus the proposed retrofit design approach is
feasible for practical applications.

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Hi
Here is new link

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asim99

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