TESTS ON REINFORCED CONCRETE COLUMNS REINFORCED WITH STEEL HOOPS SUBJECTED TO AXIAL TRANSIENT OR LONG-TERM LOADING

VERSUCHE AN WENDELBEWEHRTEN STAHBETONSAEULEN UNTER KURZ-UND LANGZEITIG WIRKENDEN ZENTRISCHEN LASTEN

Three types of circular columns were subjected to loading: columns with longitudinal reinforcement and reinforced with steel hoops, columns reinforced with steel hoops only, and columns without any reinforcement. All columns were 60 cm long and had a diameter of 15 cm. B225 concrete was used and loaded at 28 days. Rapid tests were carried out during which longitudinal and transverse deformations were observed up to rupture point. Creep tests lasted two and a half years. Results obtained for columns with longitudinal reinforcement and reinforced with steel hoops are as follows: 1. The elastic limit was reached in the longitudinal reinforcing bars when the load reached 70 percent of the ultimate load. The effect of the reinforcement cold working on the bearing capacity of the columns under ultimate loading was studied. 2. As soon as the elastic limit is reached in the longitudinal reinforcement, there is a risk of "plastic" buckling for all posts. In posts built according to German specifications, this state can be reached at half of the ultimate load. 3. The greatest relative load in long-term tests corresponds to 84 percent of the immediate strength. Although the columns tested were not completely destroyed, only the cold working treatment of the reinforcement prevented its rupture. The columns were shortened by 30 percent; they could not have been accepted in normal construction practice. /IRRD/

• Corporate Authors:

  Deutscher Ausschuss fuer Stahlbeton

  Berlin-Wilmersdorf,   Germany 
• Authors:
  • Rusch, H
  • Stockl, S
• Publication Date: 1969

Language

• German

Media Info

• Features: Figures; References; Tables;
• Pagination: 64 p.
• Serial:
  • Issue Number: 205

Subject/Index Terms

• TRT Terms: Bearing capacity; Breaking loads; Buckling; Cold working; Columns; Creep tests; Deformation; Elastic limit; Load tests; Longitudinal reinforcement; Material reinforcement; Reinforced concrete; Rock fracture
• Old TRIS Terms: Test results
• Subject Areas: Bridges and other structures; Highways;

Filing Info

• Accession Number: 00081816
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Files: ITRD, TRIS
• Created Date: Jul 15 1975 12:00AM