THE EFFECTIVENESS OF HELICAL BINDING IN THE COMPRESSION ZONE OF CONCRETE BEAMS

摘要

A series of reinforced and prestressed concrete beams was tested by point loading at mid-span to determine the efficiency of helical reinforcement in the compression zone as a means of improving the moment-rotation characteristics of the plastic hinges which formed. Comparisons were made between beams containing helices, beams containing rectangular stirrups at different spacings and beams containing both. It was concluded that helices were generally more efficient than stirrups in terms of weight of steel for a specified increase in plastic rotation;rectangular stirrups tended to deform outwards and permit the compression zone to crush.