What is the difference between the waist bar (structural bar) and the torsion bar in the beam

What is the difference between the waist bar (structural bar) and the torsion bar in the beam

The difference between the waist bar and the torsion bar is: 1. The waist bar is a structural steel bar, which is not calculated. It is configured when the beam has a certain height. The torsion bar is calculated to meet the reinforcement ratio and the torsion bearing capacity of the component. 2. The waist bar is generally arranged on both sides of the beam, along the beam height, and the torsion bar is also used in the spiral staircase, which is used in the four corners, sides, top surface of the section, Torsion bars are generally composed of longitudinal reinforcement and stirrups

What's the difference between erection bar, waist bar, structural bar, additional bar and torsion bar?

Erecting bars are used to connect negative moment bars
Waist bar is a general term for structural bar and torsion bar
The construction bar starts with G and the anti torsion bar starts with n. The practice is similar, and the main difference is in the anchoring
The meaning of additional reinforcement is very wide, including beam negative bending moment reinforcement and plate negative bending moment reinforcement, as well as hole and folded plate reinforcement and so on!

When the beam is higher than the plate, how to calculate the height of the beam web and how to arrange the waist reinforcement

It is unilateral. In this case, if it is much higher, the plate reinforcement can act as the waist reinforcement. If it is a little higher, it depends on whether the net web height below is greater than 450. If it is large, the waist reinforcement should be configured according to the regulations

Find out the actual length of a spring steel wire: the helix has three circles, the length of helix is 2cm, and the height of helix is 0.5cm
Is there a formula for finding the length of helix? What's the matter with Archimedes helix? Is it applicable?

It's very simple to think of the spiral as winding on the cylinder surface, and then expand the side of the cylinder to form an equidistant spiral into a straight line
Archimedes spiral has nothing to do with this problem, which means r = α θ in generalized polar coordinates
There are many kinds of spirals, but the general method is integration
If you are really interested, go to study advanced mathematics