The effect of rate of loading upon the static and fatigue strengths of plain concrete in compression

Abstract

Synopsis The paper describes an experimental investigation into the effect of the rate of application of steadily increasing loads upon the static strength and of fluctuating loads upon the fatigue strength of plain concretes in compression. Concretes made with gravel, limestone or Lytag aggregate were tested. Increasing the rate of application of load was found, in general, to enhance the static strength andfatigue strength of all three types of concrete. The increase in static strength was found to be greatest in concrete with a relatively weak and soft aggregate such as Lytag and least in a concrete with relatively strong and stiff aggregate such as limestone. In the fatigue tests, a strong correlation was found between the rate of strain increase per cycle during most of the life of a specimen and the endurance of the specimen, irrespective of the rate of application of the load.

A rate-dependent stochastic damage–plasticity model for quasi-brittle materials

“…6 and 7 against the collected existing experimental results [6,8,19,25,41,45,49]. The main trend of the increase of strength under fast loading is well reproduced.…”

Effects of strain rate on mechanical behavior of modeled recycled aggregate concrete under uniaxial compression

“…In addition, it was reported that the strain-rate sensitivity of concrete varied with aggregate quality. Sparks and Menzies [19] found that the increase in strength was greater in concrete with a relatively weak and soft aggregate than that in concrete with relatively strong aggregate. Since the recycled aggregates are normally weaker than the natural aggregates [1,2], it is expected that the strain-rate sensitivity of RAC is different from that of NAC.…”

High-Performance Concrete and Fiber-Reinforced High- Performance Concrete under Fatigue Efforts

“…At present, it is accepted that frequency values between 1 and 15 Hz hardly have any influence on fatigue life, provided that the maximum stress level is not over 75% of the compressive strength [22][23][24][25][26]. Noteworthy is the research developed by Zhang and Wu [27], which proposed, for the first time, an S-N curve as a function of the frequency of the cyclic load.…”

“…Numerous investigative works have demonstrated that there is a direct relation between the secondary creep rate and the fatigue life. The secondary creep rate depends on the loading frequency and the maximum strain level [23,28,29,37].…”