Can someone tell me how to design a compression ring for the steel building dome please ? Or give me some refrence for design.
Ok, so you’ve got a compression ring.
We’ll assume that it takes an evenly distributed load around its entire circumference (Not exactly true but a good assumption especially if it ties together 20+ columns). This means it’ll experience a uniformly distributed tension force around it if the thickness of the band is small compared to the radius of the ring.
If you know the magnitude of the outward force, you can find the necessary tensile force to keep it from flying apart. Then you just use stress=force/area to find the required cross-sectional area of the band, assuming you know the allowable stress on the band.
Are you asking about hoop stress? If I understand you correctly, are talking about a ring base for part of a geodesic dome, or something? A quick approximation for the necessary tensile strength is to consider the force component acting in one direction only. To simplify, imagine looking at a cross-section of a pressurized cylinder. If you were to cut this cross section exactly in half, the projected force in one direction (x-component of pressure acting on the inside cylinder wall) would have to equal the force on the cut edges of the cylinder wall acting in the opposite direction.