Polotuhé spřažení dřevobetonových nosníků pomocí ocelových perforovaných plechů a konvexních hřebíků

Abstract

Thanks to good qualities of both materials are timber-concrete composites suitable solution for ceiling constructions of new buildings and reconstructions of residential or civil buildings. In literature it can be found many ways how to create connection (joint) between timber beam and concrete slab. The methods of coupling are more and more sophisticated which carries bigger demands on control of implementation and technological practice. The aim of this paper is to verify possibilities and functionality of technologically simple and at the same time sufficiently effective joint of timber-concrete ceiling or roof supports by steel perforated thin sheets, that are nailed to the timber element by convex nails and embedded in reinforced concrete slabs. The condition for the selection of coupling means was common availability of joints and their usage not technologically demanding like other methods of joining (e.g. adhesive battens, milled grooves and others). In many cases was simple joint of concrete and timber more effective than more technologically demanding methods. The functionality of the semi-rigid joint was verified theoretically on FEM model and analytic calculation. Practical functionality was tested on the small scale samples representing the joint and on the real construction samples. It was necessary to specify material characteristics of all element of the timber-concrete cross-section i.e. timber, concrete, convex nails and pierced steel plates, in order to compare test results with FEM model and theoretical calculation. Statistical aggregates of material characteristics were used as an input data for SBRA simulation. Summary of whole project, its contribution to practical and theoretical field and achievement of established goals were described in the conclusion part of the paper.