Dr. Gilyén Jenő:
A vasbeton gerendák törési mechanizmusa – I. rész
Kivonat
The details discussed in the article and in several other technical literature proof the evidence of the statements evaluating the impacts as focused/listed in the introduction. Beside of the basic physical background also the usual human intention in simplifying the hard work increases the change of the real structural model. Unfortunately this latter point is neglected in the past 40–50 years by standardisers, who are recruited basically of researchers, who have much more laboratory-experience than that of real experience of the real working site conditions and trends. Furthermore the standardisation concepts focus mostly on common slender-type components (colums and beams) where the discussed impacts have less importance. Nevertheless author examined a lot of of existing structures, where „L/b” („Length/Height or Thickness”) was far below of the typical slender shape, and his calculus pointed the serious change of the bending moment really arised at the supports. The less was the „L/h” parameter, the less rotation () occurred at the beam’s end. Consequently the closing of the cracks happened later and so the impact of the shrinkage of the joint-concrete was more serious. The case is very similar at the modern precast elements, which are made of higher strength / higher modulus concrete. Here also the trend of the decrement of the rotation ( at the beam’s end) is observed.
Keywords: Shrinkage-cracks; Incompatibility in deformations; Structural cooperation between very different concrete-parts; Post-treatment possibilities.
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