09-03-2010, 02:10 AM
@ridz:
first, Sorry for my poor english.
angel means angel of neutral axis.
1)cloumm section is bisymmetric (both geometric shape and position of rebars must be bisymmetric):
for example : square,rectangle,circle,I-shape,box,pipe...
If You Specify one neutral axis angel, and move neutral axis from A to B,
then you can obtain one [Pn,Mnx,Mny] according to every new position of neutral axis.
All [Pn,Mnx,Mny] datas assemble one P-M curve.
For bisymmetric section, you iterate (or rotate) neutral axis angel from 0 degree to 90 degree,
then you obtain the entire P-M curves of your cloumm.
2)cloumm section is monosymmetric (both geometric shape and position of rebars must be monosymmetric):
for example : C-shape,T-shape,...
Rotate neutral axis angel from 0 degree to 180 degree.
3)cloumm section is arbitrary:
for example : L-shape or whatever you want.
Rotate neutral axis angel from 0 degree to 360 degree.
first, Sorry for my poor english.
angel means angel of neutral axis.
1)cloumm section is bisymmetric (both geometric shape and position of rebars must be bisymmetric):
for example : square,rectangle,circle,I-shape,box,pipe...
If You Specify one neutral axis angel, and move neutral axis from A to B,
then you can obtain one [Pn,Mnx,Mny] according to every new position of neutral axis.
All [Pn,Mnx,Mny] datas assemble one P-M curve.
For bisymmetric section, you iterate (or rotate) neutral axis angel from 0 degree to 90 degree,
then you obtain the entire P-M curves of your cloumm.
2)cloumm section is monosymmetric (both geometric shape and position of rebars must be monosymmetric):
for example : C-shape,T-shape,...
Rotate neutral axis angel from 0 degree to 180 degree.
3)cloumm section is arbitrary:
for example : L-shape or whatever you want.
Rotate neutral axis angel from 0 degree to 360 degree.