Abstract
Reinforced concrete beam is normally reinforced by steel bars to sustain tensile forces occurring due to flexural response, and vertical steel reinforcement to sustain shear stresses. On the other side, the truss system is a structure composed by triangle. Truss system develops its flexural capacity based on the inter-action of the bar elements. Therefore, introducing of the truss system to the reinforced concrete beams by modifying of the tensile and shear reinforcement may increase the beam flexural capacity. The study on the application of the truss system to the reinforced concrete beams has been conducted. The shear reinforcement was modified to form the triangles that were connected to the tensile reinforcement on the bottom and compressive reinforcement on the top. The steel bar elements were connected by welding to form a truss system. The effect of the buckling of the compression bar element on the truss system may be avoided due to the constrain effect of the surrounding concrete. In order to clarify the effect of the truss system reinforcement to the flexural behaviour, a series of specimens was prepared. The beams specimens have a length of 3.3 m with cross section of the 15 by 20 cm. A normal concrete beam was also prepared as control specimens. Results indicated that the concrete beams reinforced by truss system had flexural capacity higher than the normal beam.
Highlights
The constructions using concrete materials are still dominant due to its advantages
The cement using in the concrete is almost 90% composed by lime stones that coming from natural materials
The flexural capacity of the concrete beams is the accumulation of two flexural actions, that are due to couple moment of tension and compression forces, and due to the flexural effect of the truss reinforcement system
Summary
The constructions using concrete materials are still dominant due to its advantages. The most important characteristic of concrete materials such as workability, low cost and fire resistance as well as its low maintenance cost. The developing of the new concept in structures design to minimize the using of the concrete has been conducted and proposed, such as box type girders, corrugated beams, strengthened beams or column with FRP materials and sandwich structures [4,5,6,7,8,9]. The concrete beam develops its flexural capacity based on the couple moment interaction between tension force on the steel reinforcement and compression force on concrete [10]. The buckling effect of the stirrup reinforcement may be avoided due to the constraint effect of the surrounding concrete In this concept, the flexural capacity of the concrete beams is the accumulation of two flexural actions, that are due to couple moment of tension and compression forces, and due to the flexural effect of the truss reinforcement system. This paper presents the experimental results of the concrete beams reinforced by steel truss system as the reinforcement
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