Structural Behavior Of Simple Supported Two Layers Reinforced Concrete (Normal strength concrete & Mortar with 3-Dimension glass fiber), Beams. Tikrit j. eng. sci. [Internet]. 2021 Aug. 1 [cited 2026 Nov. 10];28(2):93-106. Available from: http://www.tj-es.com/ojs/index.php/tjes/article/view/191