You're looking for a reliable resource on the design of prestressed concrete structures. The article you're referring to is likely "Design of Prestressed Concrete Structures" by Arthur H. Nilson, which is a well-known textbook in the field.
These are than a scanned PDF from Nilson’s 1992 edition. You're looking for a reliable resource on the
Arthur H. Nilson's " Diseño de Estructuras de Concreto Presforzado You're looking for a reliable resource on the
: Often features shared papers and textbook sections for university students. : When searching for "updated" versions, always check the You're looking for a reliable resource on the
Because Nilson’s estate and publishers (Wiley) strictly control copyright, finding a free updated Nilson PDF is rare and often illegal. However, there are legitimate alternatives that provide the same rigorous content: