Minimalinvasive Materialuntersuchungen an seilabgespannten Rohrmasten zur Bauwerkserhaltung

Minimally invasive material tests on guyed tubular masts

Guyed tubular radio masts were erected in the fifties and sixties using parallel wire bundles. Due to corrosion problems, the guying must often be replaced by fully locked coil ropes. The measure changes the system stiffness and results often into the need of a repetitive calculation of the structure. Even without any material deterioration, it is not always possible to fulfill the (high) requirements of the actual standards. Strengthening works on the mast shaft are usually extremely costly and can cause a total loss of the structure economically. For the refurbishment of a 231 m high guyed tubular radio mast in Berlin Scholzplatz minimally invasive material testing was performed basing on a combination of in situ and lab testing. The statistical evaluation of the data showed that the existing material properties are better than specified in the original design documents of the structure. Costly renovation works on the mast shaft could be avoided and the mast was preserved.