Investigations on rheological strains of compressed concrete elements strengthened with external composite reinforcement CFRP |
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| Authors: | Tomasz Trapko Mieczysław Kamiński Michał Musiał |
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| Affiliation: | 1. BAM Federal Institute for Materials Research and Testing, Unter den Eichen 87, D-12205 Berlin, Germany;2. Benteler SGL Composite Technology GmbH, Fischerstraße 8, A-4910 Ried im Innkreis, Austria;1. School of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou 510006, China;2. Key Lab of Structures Dynamic Behavior and Control (Harbin Institute of Technology), Ministry of Education, Heilongjiang, Harbin 150090, China;3. School of Civil Engineering, Harbin Institute of Technology, Heilongjiang, Harbin 150090, China;1. ISISE, Dept. Civil Eng., University of Minho, Guimarães, Portugal;2. Dept. Civil Eng., University of Aveiro, Portugal;1. Department of Civil Engineering, University of Engineering & Technology, Taxila, Pakistan;2. University of Engineering & Technology, Taxila, Pakistan;3. NWFP University of Engineering & Technology, Peshawar, Pakistan |
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| Abstract: | The results of experimental studies on rheological strains of compressed concrete elements strengthened with surface CFRP materials are presented in this paper. The objective of the investigations was to estimate the influence of long-term load on strains and load-bearing capacity of compressed elements strengthened with CFRP materials. The studies were performed on specimens with various types of reinforcement. The specimens were strengthened with external composite reinforcement – longitudinal segments of CFRP strips and transverse confinement executed with CFRP sheets. The experimental studies were divided into two stages, in which specimens were subjected to long-term axial compression. The objects of the investigations were cylindrical specimens with a diameter of 113 mm and height of 350 mm. The plain concrete specimens were loaded with the level of about 1/3fcm,cyl (mean cylinder compressive strength of the concrete). After the period of initial loading the specimens were strengthened and the level of effort was increased to about 2/3fcm,cyl. The tests were conducted in constant thermal and moisture conditions. In the paper, the dependences of long-term strains increase in time are presented for the experimental elements. Additionally, theoretical studies connected with rheological model identification were performed. |
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