Science – Future of Lithuania / Mokslas – Lietuvos Ateitis, Vol 6, No 5 (2014)

Experimental and Theoretical Research on Reinforced Lightweight Concrete Flexural Elements

Deividas Rumšys (Vilnius Gediminas Technical University, Lithuania)
Darius Bačinskas (Vilnius Gediminas Technical University, Lithuania)
Edmundas Spudulis (Vilnius Gediminas Technical University, Lithuania)
Eugenijus Gudonis (Vilnius Gediminas Technical University, Lithuania)
Aleksandr Sokolov (Vilnius Gediminas Technical University, Lithuania)


The paper deals with analysis of structural lightweight concrete. New lightweight concrete mixture made with expanded clay aggregate has been proposed and applied for experimental rein-forced concrete beams. Totally 8 beams with different rein-forcement ratios (0.309%, 0.557%, 0.895% and 1.255%) were tested under short-term four point bending loading. Stress-strain behavior of the beams under considerations has been investigated. Average strains at 4 different levels of pure bend-ing zone and vertical displacements at 12 different points of the beam were measured. During the test, deformations and crack-ing of the pure bending zone were additionally observed using high-speed digital video cameras. The data obtained by cameras were analyzed using digital image correlation technique. Applying the test data bending moments and curvature diagrams were derived for each beam. The obtained relationships were compared with theoretical results calculated using design code methods LST EN and STR. Using the inverse algorithm developed by VGTU, tension reinforced lightweight concrete stress and strain diagrams were obtained, which were adapted to numerical modeling by software ATENA. Moment and curvature diagrams obtained by finite elements program were compared with experimental moment and curvature diagrams. Good agreement between both diagrams has been obtained.

Article in: Lithuanian

Article published: 2014-12-19

Keyword(s): lightweight concrete; reinforced concrete beams; numerical analysis; stress and strain; curvature; experimental research.

DOI: 10.3846/mla.2014.689

Full Text: PDF pdf

Science – Future of Lithuania / Mokslas – Lietuvos Ateitis ISSN 2029-2341, eISSN 2029-2252
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 License.