Technology and energy passivity of fully assembled reinforced concrete, steel-reinforced concrete and pipe-concrete elements of construction systems in the conditions of Iraq.

This article proposes a threaded connection of prefabricated reinforced concrete columns, which can be used to connect elements of prefabricated buildings and structures. The contact-screw connection of prefabricated reinforced concrete consists of an upper and a lower column, both have a steel external thread of a cylindrical shape in the end section are connected, while in the upper and lower parts it consists of 16 deformed steel rods with welding, in the upper part there are 8 rods, in the same amount at the bottom, corresponding at the same time to have a secure connection at the end of the installation. The strength of a helical column connection is determined to ensure the transmission of axial loads and moment in the connections, allowing for shear and shearing failure of the threads that can occur between the connected columns. The structural characteristics of the connected columns have been determined in accordance with coda standards. By means of the necessary calculations for the screw connection of precast concrete columns (steel-reinforced concrete, pipe concrete), the corresponding rigidity and strength were confirmed. The developed new connections will help in modular building construction and speed up the installation process. [ABSTRACT FROM AUTHOR]