Is it more accurate measurement, or other reason? In a text book, it said it is related to the size.
2007-02-09 00:52:50 · 3 answers · asked by constructions-student 1 in Science & Mathematics ➔ Engineering
Usually column center line is used because that is the ideal state for calculating loads. If the load on the column comes on it concentrically the loads will cause only axial force, however if the loads have an eccentricity (load is not in the center of the cross section) a moment is induced in the column and an interaction equation is needed for analysis. The analysis then must take into account certain second-order moments. This is why they are designed this way. If you are asking why the centerlines are used in constrction dosuments, there are several reasons. For one thing when the buiding is intially designed column sizes are unknown and by specifying the centerpoints of all the columns the designer can change the size up or down with out having to worry about changing the center to center dimensions. Also in construction it is easier due to tolerances to center each column on a point instead of lining up the edge of the column. If the buider were to use the edge of the column the small error would add up over a long row of columns. So the answer is that it is easier and more accurate.
2007-02-09 04:51:56 · answer #1 · answered by Michael H 2 · 0⤊ 0⤋
centreline dimensions are the most accurate,if you have columns of the same or different outside dimensions it makes it easier and more accurate to make a centre and then measure out the size of the footing off the centreline.also if there is a beam connecting to the top of the column this will be worked out in accordance with the centre of the columns.
2007-02-09 15:59:10 · answer #2 · answered by craig c 1 · 0⤊ 0⤋
It might be because the Load is distributed more evenly
2007-02-09 09:05:11 · answer #3 · answered by mdlbldrmatt135 4 · 0⤊ 0⤋