THE STIFFNNESS AND CRACK RESISTANCE OF THE REINFORCED CONCRETE HOLLOW-CORE SLABS, THAT WERE STRENGTHENED WITH THE CFRP ADDITIONAL ARMATURE
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Abstract
In the questions of reinforced concrete structures additional CFRP armature strengthening, other than to ensure the strength capacity, the compliance with the stiffness and crack resistance requirements for the strengthened elements is important too. The presence of the contact joint in the cross-section of the strengthened element, which destruction is a major cause of the structure efficiency loss, imposes restrictions on the strength capacity of the CFRP armature usage possibility, which should also be taken into account in the operational integrity analysis. The evidence-based approach to the reinforcement rate analysis, which is based on the operational integrity analysis, which takes into account the joint work of the additional armature with the concrete, allows the ensuring of the proper functioning and longevity of the strengthened structure throughout the design lifetime with fair debits. In this article the results of the experimental and theoretical researches of the stiffness and crack resistance of the reinforced concrete hollow-core slabs, that were strengthened in the tensile zone with the help of additional CFRP armature are listed. The features of the strengthened elements, which were identified during the experiments, were taken into account when the deflection and crack opening width calculations were developed.
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References
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