Pathological manifestations in a prestressed concrete flat slab building - a case study: part II - structure reinforcement.

Prestressed concrete flat slabs with unbonded tendons are widely used in Brazil due to their advantages. However, the bold achieved with prestressed structures often results in projects with greater intricacy. This paper presents a case study of a commercial building constructed in Rio Grande do Sul, designed with pretressed concrete flat slabs with unbonded tendons. Some pathological manifestations, such as excessive deflections and cracks in the slabs, were observed during the construction phase. The description of the structural reinforcement solutions used in the slabs is presented, including bonded overlays, carbon fiber tape inserts, and externally prestressed metallic reinforcements. At the end of the reinforcement works, load tests were conducted on the slabs, demonstrating the efficiency of the used solutions.