Effect of Repeated Loads on Steel -Concrete Composite Beams with High Strength Reinforced Concrete

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Muthanna Journal of Engineering and Technology
MJET


Volume 5 issue 3, 2017

Suhaib Yahya Al-Darzi

Civil Engineering Department, College of Engineering, University of Mosul/Mosul

 

 

 

 

 

ABSTRACT

The present study utilized an experimental tests to investigate the effects of using high strength concrete (HSC) on ultimate resistance, deflection and slip of steel-concrete composite beam under monotonic and repeated loads. Sixteen beams divided into four groups having concrete with compressive strength of 25MPa, 42.6MPa, 43.3MPa and 43.9MPa investigated experimentally. Results indicated that the use of HSC increase the strength of the beams by about 18.82% and 52.91% under monotonic and repeated loads respectively. The beam resistance decreased under repeated load in comparison with monotonic load by about 5% to 28.53%. Using of fibers increase the ultimate strength by about 10% to 28.65%, decreasing deflection by about 15% and decreasing slip by about 26.5%. The ultimate strength estimated experimentally are less than the AISC-LRFD specifications’ formulas.

 

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