Stone as a structural material. Part 3: Post-tensioned stone structures

To utilise stone’s high ratio of compressive to tensile strength to maximum effect, stone structures can be compressed using tensioned cables or bars. Post-tensioned stone increases the failure load of stone in bending, but also the stiffness of a structure by reducing joint cracking. This method of construction is widely used for concrete structures, but the advantages of using similar techniques with stone are only just being realised. This article covers the reasons for post-tensioning stone, the advantages of doing so, and presents a series of projects that demonstrate the evolution and development of our expertise and understanding at Webb Yates.