Title:
Behavior and Failure of High-Strength Concrete Subjected to Biaxial-Cyclic compression loading
Author(s):
Erik L. Nelson, Ramon L. Carrasquillo and David W. Fowler
Publication:
Materials Journal
Volume:
85
Issue:
4
Appears on pages(s):
248-253
Keywords:
biaxial loads; cyclic loads; failure; fatigue (materials); high-strength concretes; stresses; Materials Research
DOI:
10.14359/2098
Date:
7/1/1988
Abstract:
Static and cyclic tests were performed to determine the properties and behavior of plain high-strength concrete subjected to biaxial cyclic compression. The primary variables studied were the maximum stress level and the biaxial stress ratio. Other variables included the effect of stress range and moisture content in the concrete. For specimens tested in fatigue at maximum stress levels below approximately 76 percent, results show failure occurred at a higher number of load cycles as the biaxial stress ratio decreased. Endurance limits for a fatigue life of two million cycles were found in the range of 47 to 52 percent of the uniaxial static compressive strength. The effect of cycling below the fatigue limit resulted in postfatigue specimens having an increase in uniaxial static strength of about 39 percent over the control specimens tested prior to fatigue loading. The data were evaluated by regression analysis to develop a biaxial compression envelope. The failure envelope represents the predicted fatigue life of high-strength concrete as a function of the applied stress ratio. The observed failure mode for high-strength concrete under biaxial cyclic loading is also described.