Flexural strength of steel fiber ultra high strength concrete beams under static and repeated loads

الملخص EN

The goal of the present work is to study the performance of Ultra High Strength Concrete (UHSC) beams in flexure under static and repeated loads.

The main consideredvariables are the main reinforcement ratios which are (0.0129, 0.0204, and 0.0323), and the method of applying load.

For each reinforcement ratio two beams werecasted, one of them was tested under four points static load and the other one underrepeated load up to failure.

The behavioral characteristics of Ultra High StrengthConcrete dominantly depends upon its load history, for this purpose experimentalinvestigation of the behavior of (UHSC) beams under load history of repeated cyclesis performed as well as that it is compared with the behavior under static load.

Theaverage cube compressive strength of the UHSC used in casting the beams was ashigh as (124 N/mm2).

The load deflection curves, first cracks and failure loads, crackpattern, and concrete strain distribution over the depth of the beams were presented.