reduction in construction time. Modernized large-panel housing construction also has
good prospects in this direction. In the factory, it is easier to maintain a high level of
product quality, and the external surfaces of products require less finishing work. The
implementation of a significant amount of work at reinforced concrete products
factories provides a reduction in construction time, improving the safety and efficiency
of the buildings erection process.
Joints ensure the combined operation of buildings individual elements. The keyed
connections of concrete and reinforced concrete elements used in construction can be
classified into: contact and with the presence of a seam; single-keyed and multi-keyed;
with square, rectangular, round or oval key cross-section; with a rectangular, trapezoid,
triangular, semicircular or broken keyway profile; compressed or reinforced (with the
location of the reinforcement in one, two or three levels of the key height); from heavy,
expanded clay and fiber concrete; with a form of destruction on a key from a crushing,
a shearing, breaking up or a seam destruction.
For the last thirty years, the Poltava National Technical University named after
Yuri Kondratyuk has carried out systematic theoretical and experimental studies of the
keyed joints of concrete and reinforced concrete elements [4], which made it possible
to formulate recommendations for their design and to improve the existing design
solutions of joints: hollow-core slabs with monolithic bearing girders in ARKOS
precast-cast-in-place structural system and with wall panels in large-panel buildings;
overcolumned slab with a column in KUB-2.5 structural system; wall panels on wire
rope loops in large-panel buildings. To calculate the strength of the joints, a technique
[4] is proposed, which is based on the theory of concrete plasticity behavior, the
variational method and the principle of virtual velocities, considers the stage of
destruction and takes into account the full set of influence factors.
BIBLIOGRAPHICAL REFERENCES
[1] Pavlikov, A.M., D.K. Baliasnyi, D.K., Harkava, O.V., Dovzhenko, O.O.,
Mykytenko, S.M., Pinchuk, N.M. et al. (2017). Suchasni konstruktyvni systemy
budivel iz zalizobetonu [Modern reinforced concrete structural systems]. Monohrafiia,
Poltava: PoltNTU im. Yu. Kondratiuka [in Ukrainian].
[2] Zhao, X. & Riffat, S. (2007). Prefabrication in house constructions.
International Journal of Low-Carbon Technologies, Vol. 2 (1), pp. 44-51.
[3] fib Commission 6. (2008). Structural connections for precast concrete
buildings. Guide to good practice. Lausanne: International Federation of Structural
Concrete.
[4] Dovzhenko, O.O. (2015). Mitsnist shponkovykh ziednan betonnykh i
zalizobetonnykh elementiv: eksperymentalni doslidzhennia [Strength of keyed joins of
concrete and reinforced concrete elements: experimental research]. Monohrafiia,
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