Noteworthy to all engineers who are members of the organization: the permissible amount of column deviation in one floor or the entire height of the structure (ninth topic – Aba)
Question: According to the 9th topic, the permissible deviation limit of concrete columns is 6 mm per 3 meters of height.
Considering that the concrete columns are implemented as roof to roof, can this rule be extended to the entire height of the structure or not?
For example, in a structure with a height of 18 meters, a concrete column from the foundation to the last roof can have a deviation of 3.6 cm.
Or is this rule only defined for off-centering in a roof and cannot be extended to the entire height of the structure?
Answer from Dr. Ahmadreza Jafari:
First of all, it should be noted that the regulation related to construction tolerance limits in concrete structures has been removed from the 9th issue in the 99th edition and has been transferred to Iran’s Concrete Regulations (ABA).
The permissible limit of deviation from the vertical extension is divided into two states. For the edge and surface of columns, bases, walls, corners and corners, the amount of deviation allowed for every 3 meters is considered equal to 6 mm.
(This value is limited to 25 mm for the entire height.))
For visible corners of columns, control seams, grooves and other prominent visible lines, the permissible deviation is limited to 6 mm per 6 meters of height and 12 mm along the entire length of the member.
In other words, the deviation of the column from the vertical direction may be within the permissible limit in each floor; But the total deviation from the vertical direction is more than the permissible limit. So, in controlling the deviation of the column from the vertical direction, this value must be controlled in each floor and in the entire height of the column.
In addition, its permissible value is not the same for different columns, and for example, this permissible limit is lower for columns that are placed on the side of the facade of the building or in the vicinity of the cut seam.
Edited and edited by Khalil Dashti
Channel of National Regulations-Engineering Rights
This post is written by amiralidashti93