Modeling Curved Frames, Walls and Floors

ETABS has various options to draw non-straight frames , walls and floors, they can be chosen using options indicated below:

Arc (3 points)
This option can be used for frames , walls (plan) and floors

1. Select 1s point start of arch
2. Select 2^nd point end point of arch
3. Select radius of arch
4. In the case of floor element additionally at least two straight lines are required

Arc center and 2 points
This options can be used for frames, walls(plan) and floors

1. Select start point of arch
2. Select center of arch
3. Select end point of arch
4. In case of floors need to close arch with straight lines or enter

Bezier curve
Available for frames only
Refer to page below for information about bezier lines:
https://en.wikipedia.org/wiki/B%C3%A9zier_curve

1. Select first point
2. Select last point
3. Select points in between first and last and ENTER to finalize curve

Spline
Splines are available for frames only, more information about splines can be found on page below: https://en.wikipedia.org/wiki/B-spline

1. Draw using a control frame/polygon
2. Select first point
3. Select last point
4. Select points in between first and last and ENTER to finalize curve