Title: Cracking in Prestressed Concrete Structures
Author(s): B. O. Aalami and F. G. Barth
Publication: Symposium Paper
Appears on pages(s): 157-202
Keywords: beams (supports); concrete slabs; cracking (fracturing); deflection; evaluation; post-tensioning; prestressed concrete; renovating; repairs; serviceability; strength; unbonded prestressing; Structural Research
Based on extensive observations and a survey of the performance of unbonded post-tensioned buildings, paper presents a categorization of the common cracks in beams and slabs, and the principal causes of crack formation due to restraining effects of supporting structures are discussed in detail. Current methods of crack formation control are also presented and evaluated, and the consequences of cracks on serviceability and strength of post-tensioned buildings are reviewed. In addition, recommendations are made for crack mitigation and maintenance of buildings that are post-tensioned with unbonded tendons.