Abstract
The paper summarises the experimental and numerical analysis of flexural capacity and deformability of structural concrete beams prepared as composite members consisting of two concrete layers made of reinforced normal concrete and high‐performance concrete (HPC). The reinforced concrete composite beams used in the tests were prepared in full scale with the cross‐section of 120 × 200 mm and the effective span of 2950 mm. The basic samples were composed in two layers consisting of high‐performance concrete as the top layer, and normal strength concrete. The results of the analyses confirm a significant improvement of structural properties of composite beams in comparison to the beams prepared totally of normal concrete, and in some cases also in comparison with the beam totally made of HPC.
Highlights
Experimental investigationsIn the last decade high-performance concrete (HPC)-HSC are more widely used in practice parallel with growing interest of researchers to precisely describe mechanical properties and methods of design of structural members [14]
The numerical analysis revealed that the composite beams with different depth of high-performance concrete (HPC) layers have the carrying capacity almost equal to the control beam totally made of HPC
The experimental and numerical analyses conducted on reinforced concrete composite beams made of normal concrete within HPC layer revealed various positive effects of strengthening the composed beams compared to homogenous, normal strength concrete beams
Summary
In the last decade HPC-HSC are more widely used in practice parallel with growing interest of researchers to precisely describe mechanical properties and methods of design of structural members [14]. As reported by Yamada [6, 7], the structural reinforced concrete and prestressed composite beams with the HSC layer tested in Japan under short-time load, may have improved sectional parameters, eg a higher flexural stiffness and greater bending capacity in comparison to homogenous members, made of normal strength concrete. Our previous studies conducted on models of reinforced concrete composed with a partial use of HPC beams under short-time loading revealed the significant increase of beam stiffness and ultimate capacity in bending, compared to control RC beams made of normal concrete [810]. The reinforced concrete composite beams were prepared with the cross-section of 120 × 200 mm and the effective span of 2950 mm. Normal concrete as the bottom layer Adhesive layer HPC layer on the top of the beam with the thickness of 40 mm. The concentrated load subjected to the tested beams was registered with the accuracy of 100 N
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