![]() Therefore, the parametric calculations of maximum FRP bar diameter are described in this paper and new tables and diagrams are shown. Due to different modulus of elasticity between FRP and steel, the tables used for steel cannot be used for concrete beams reinforced with FRP bars. These two values depend on each other and the focus of the paper is set on calculations of the bar diameter. ![]() Procedures for the calculation of maximum bar diameter and bar spacing to control crack width are shown in the paper. Now, more and more, these rules are implemented in some national codes, and they will be implemented in Eurocodes soon. Calculation methods for reinforced concrete elements with FRP bars (FRPRC) are developed from calculation methods for reinforced concrete elements with steel bars. During the last decades, FRP reinforcement became a good replacement for steel reinforcement, especially in an aggressive environment. To simplify the calculations of crack width, for the elements subjected to bending, the EN ( 2013) gives a restriction of bar diameter or bar spacing which satisfy allowable crack width (tables 7.2(N) and 7.3(N)). During the design of reinforced concrete elements, satisfying serviceability limit state conditions is very important.
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