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In Poland, in the last 20 years there have been large and often far-reaching changes in designing of construction works, including changes in normative regulations. Polish standards were gradually adapted to European eurocodes obligatory in European Union Member States, to be eventually replaced by publication of an identical text or by endorsement. Currently valid in Poland for the design of reinforced concrete structures Eurocode 2, part 1-1 was approved by the Polish Committee for Standardization in 2008 and eventually replaced the conflicting national standards in 2010. According to the information contained in the general provisions, it is intended to prove compliance of buildings and engineering structures with the requirements of Council Directive 89/106/EEC concerning, among other things, resistance and stability, applicable to new, designed structures. Part 1-1 EC2 concerns the design of reinforced concrete structures with the exception of plain surface bars previously used quite commonly in structural elements working under average values of loads: floor slabs or secondary beams for example. On the other hand, in point 7.3.4 of the mentioned code, containing the rules of calculations of crack width, there is a coefficient k 1  taking account of the bond properties of the bonded reinforcement, permitting both ribbed and with an effectively plain surface bars. Therefore, in the presented article it was made an attempt to analytically assess the crack phenomenon of the beam with plain surface reinforcement and compare this with the results of experimental research. The calculations were made for a single-span beam with one-side tensile reinforcement only, loaded with two concentrated forces of equal values, placed symmetrically in relation to the half of the span. The presented assessment includes of the cracking moment, calculations of the spacing of cracks and the width of cracks at various load levels. The obtained results were compared with the results of experimental investigations of two beams made of the same concrete and the same rebars.

Evaluation of the Work of a Single-Span Beam in the Cracked Section - Calculation Example