Retrofitting and Rehabilitation in Steel Moment-resisting Frame with Prestressed Concrete Slab against Progressive Collapse Potential

Diaphragms are a fundamental part of the earthquake-resistant system, and in terms rigidity, it is essential to transmit dynamic loads on base structure.Also, floor openings response buildings against progressive collapse issues that have received less attention.In this study, opening surfaces their positions potential steel moment-resisting frame (SMRF) were investigated according alternate load path method.Also, retrofit rehabilitate two-way reinforced concrete (RC) slabs collapse, two strategies, prestressed installing carbon fiber polymer sheets surface old slab, proposed six-story SMRF simulated using finite element method. The maximum axial force around removal column 20% greater than corresponding values corner plan appropriate performance slab leads distribution ceiling diaphragm.