Abstract
The issue of reinforcing wooden beams via their joining with a concrete upper slab is still being widely discussed in the literature of the problem. The paper is an extended version of the authors' previous research conducted in this subject matter for short-term static loads. The current work takes into account also a qualitative assessment of two-year behaviour of the structure based on the measurements of its creep, temperature and relative humidity of the ambient air in typical in-door conditions. The beams were 4-m long and subject to a total load of 10 kN. Their layers had crosssectional dimensions equal to 95 mm x 195 mm and 300 mm x 50 mm for the wooden rib and reinforced concrete upper slab, respectively.
Highlights
Technical issues related to the broadly understood industry, including construction, both with regard to the erection and modernization of buildings, are increasingly focused on the economisation of newly introduced or already well-known structural systems
Each composite beam has been equipped with 5 inductive displacement sensors (LVDT), according to Fig. 5
A sincere thank you to Adamietz Sp. z o.o., and in particular President Rajmund Adamietz for equipping the test stand with steel elements, as well as the Fałkopol company and its owner, Waldemar Cieplik, for the transfer of tanks used to load the structure
Summary
Technical issues related to the broadly understood industry, including construction, both with regard to the erection and modernization of buildings, are increasingly focused on the economisation of newly introduced or already well-known structural systems. In the case of the limit states assessment of atypical building structures, only the performance of the experiment on a real scale or similar to it allows for the final reliable verification of their behavior from the point of view of the safety of use. Guided by these premises, the authors will present the research methodology and preliminary results of the experiment of long-term loading of wooden and concrete composite beams in this paper. The authors, unlike other works of this type, attempted to archive the time courses of the curvatures of the axes of wooden and concrete beam layers in creep conditions, and proposed a convenient method of loading beams using water tanks from the point of view of the construction of the measuring station
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