Analysis of protruding reinforcement bars deviations in joints of high-rise factories precast reinforced concrete columns

Abstract

The analysis of hidden geometric imperfections in the joints of old high-rise framed factories is a relevant task, particularly during their reconstruction or major repair. Such hidden geometric imperfections are quite common in the interfloor joints of built-up columns and are of major difference from an ideal solution.
In the course of the work the range of geometry of actual deviations of the protruding reinforcement bars in the examined interfloor joints of the built-up reinforced concrete columns from vertical planes where protruding reinforcement bars are placed in the solution of columns joint under the series 1.420-12 has been measured, analyzed, and defined.
Spread of the recorded data of the protruding reinforcement bars geometric deviations from the vertical in the column joints needed for study of design situation has been defined and analyzed. The found imperfections have quite wide range of geometric parameters fluctuations.
The approximation of the results of the measurements of the protruding reinforcement bars deviations in the columns joints allows us to develop a geometric scheme of actual deviations from vertical planes of the protruding reinforcement bars within the scope of the examined columns joints. The deviation geometric schemes obtained can be easily transformed into a design model needed for further analysis of the found imperfections effecting on the joints performance.
The design models obtained can also be used for the development and analysis of a method for conduction of the checking calculation of actual carrying capacity and rigidity of the built-up reinforced concrete columns interfloor joints within high-rise framed buildings and, thus, for the provision of a building
design safety in general.