TY JOUR TI The possibility of an extension to the floor of a non-residential building using lightweight structural elements of increased rigidity KW inspection KW technical condition KW bearing and enclosing structures KW superstructure KW stress test under the sole of the Foundation JO Construction and Architecture AU Hryanina, O.V. AU Yangurazov, Y.R. PY 2019 IS 7 PB Publishing Center RIOR