Prestressed concrete torsion elements in view of selected experimental investigations

The paper presents researches, which were conducted in the world on torsional behavior of prestressed concrete elements. Particular attention is paid to researches carried out in the North America and the Middle East. Some experiments, which took place before 1978 are mentioned. More recent researches from 1978–2011 are discussed. Older experiments were conducted on typical elements, which did not contain any strengthening. Researches on elements with openings, and specimens made of concrete containing steel fibers or strengthened with CFRP sheets are also presented. Experiments connected with sustained torque are discussed