DEVELOPMENT OF TENSILE MEMBERS IN LARGE SCALE BRIDGE CONSTRUCTION: STUDIES ON COMPLETELY CLOSED CABLES MADE FROM GALVANIZED WIRE ACROSS THE WHOLE CROSS SECTION OF THE CABLE

ENTWICKLUNG VON ZUGGLIEDERN IM GROSSBRUECKEBAU; UNTERSUCHUNGEN AN VOLLVERSCHLOSSENEN SEILEN, HERGESTELLT AUS VERZINKTEN DRAEHTEN IM GANZEN SEILQUERSCHNITT

SUPPORTING CABLES FOR CABLE STAYED AND SUSPENSION BRIDGES WERE CONSTRUCTED HITHERTO IN SUCH A WAY THAT EITHER THE WIRES WERE UNCOATED, OR ONLY THE NON-FATIGUED WIRES WERE GALVANIZED, THE WIRES IN THE INSIDE OF THE CABLE BEING UNCOATED. THE FATIGUE BEHAVIOUR OF THESE CABLES IS WELL-KNOWN. THREE SEPARATE CABLE SAMPLES TAKEN FROM ONE SECTION OF COMPLETELY GALVANIZED CABLE WERE EXAMINED TO SEE WHETHER COMPLETELY CLOSED BRIDGE CABLES, WHICH FOR REASONS OF IMPROVED CORROSION PROTECTION CONTAIN GALVANIZED WIRES, ALSO HAVE THE FATIGUE BEHAVIOUR PRESCRIBED IN DIN 1073. THE TEST SHOWED THAT THE COMPLETELY GALVANIZED CABLES BEHAVED IN THE SAME WAY AS CONVENTIONAL CABLES IN THIS RESPECT.