Several physical as well as numerical experiments have shown that a fluid flowing between two parallel plates can be significantly influenced by the shape of the boundary. In particular, the presence of microscopic asperities parallel to the flow (riblets) can considerably reduce the drag experienced by the fluid (see Chu and Karniadakis [7], Savill et al. [11]). The main objective of the prese...

The article considers the problem of a rectangular plate, supported by cross system stiffening ribs, bending. In addition to transverse load, plate is subjected forces in its plane, transmitted through ribs. Аn analytical solution boundary value for resolving differential equation with respect normal deflection describing deformation stiffeners, obtained. presented form series combinations regu...

In the present article, we revisit question of structural characteristics and building methods two most famous Hungarian Late-Gothic net vaults, nave vault Franciscan Church Szeged-Alsóváros Reformed Nyírbátor. Based on data gathered by laser-scanning buildings, geometric system as opposed to former state research, differ significantly from each other. While rib webbing have features characteri...

In this paper, a new type of prefabricated concrete structure system is put forward, and bi-directional multi-ribbed floor forward in combination with system.Finite element analysis carried out on the floor, its mechanical properties are analyzed, compared test hysteresis curve, rationality correctness finite obtained.

P. Pokorný, D. Dobiáš, M. Vokáč – Czech Technical University – Klokner Institute, Prague, Czech Republic This paper evaluates the effect of initial corrosion damage to the surface of the hot dip galvanized steel coating in fresh concrete on its final bond strength. The tests were performed on uncoated and hot-dip galvanized ribbed reinforcements. The measurement of bond stress (τm) according to...

An analytical model is developed for examining the vibro-acoustic properties of a fluid-loaded plate reinforced by periodic ribs of finite width. This model is used to understand the frequency filtering properties of the flexural wave and the structural-borne sound wave of the ribbed plate under different fluid loading conditions. The relationships between the flexural waves and the related sou...

Expansive soils shrink and swell with drying wetting cycles. The shrink-swell capacity of expansive can result in differential movement beneath foundations which is a very common cause foundation problems. Ribbed slab, often called waffle one the efficient inexpensive solutions for use under light structures resting on soils. This paper presents numerical analysis that used to calculate displac...