Abstract
The joints ensure the joint performance of the load carrying structural systems and they are the most responsible and important elements. Keyed joints are widely used in construction. They are characterized by an increased resistance to shear. On these grounds the structural concepts of keyed joints need further improvement. The article presents the research results of experimental test pieces five series in the form of single keys and one-keyed joints. Those samples have been tested in Poltava National Technical Yuriy Kondratyuk University. Follow strength factors have been varied: geometric parameters of joints (depth, height, width) and their ratio; angle of support surface (rectangular, trapezoidal and triangular key); level of compression; reinforcement (quality of reinforcement and the nature of its location); jointing width. The samples were made of heavy-weight, expanded clay and fibre concrete. The experiments program includes influence study both of one of these factors and their combinations. The deformations, nature of failure, the ultimate load have been studied. Structural parameters of keyed joints which ensure the efficient behaviour have been installed.
Highlights
One of the most important elements of the roadway of bridges and overpasses are the keyed joints of their bearing elements
Keyed joints are used in the formation of composite sections of precast and cast-in-place and precast constructions, as well as in the reconstruction of reinforced concrete road bridges
Keyed joints are widely used in transport construction and they require further detailed study
Summary
One of the most important elements of the roadway of bridges and overpasses are the keyed joints of their bearing elements. What can be said about the dependence of resistance to the destruction of a number of geometric parameters of joints These include the ratio of the depth of the key to its height, the shape of the profile (the angle of inclination of the loaded face of the key) and the width of the joints. The ambiguity of their accounting leads to unreasonable reserves of carrying capacity and a significant increase in the material intensity of the joints.
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