strucural element (thier shapes and fuction and stress)

strucural element 

 (thier shapes and fuction and stress)

the shapes

1.  slabs 
2. beams
3. colums
4. footings

1,2,3 are the super structure
4 is a sub structurt

stress

1. comp.stress
2. ten.stress
3. shear stress
4. flexsure=moment

The function of the lower iron skewers and iron Kanat

1-Kanat iron works to reduce the shear strength 

2-Lower iron works to reduce the flexsure =moment