pycba.prestress.Parabola#

class Parabola(e_left, e_mid, e_right, c_left=0.0, c_right=0.0)[source]#

Bases: object

Parabolic tendon in a span (RAPT/PT-Designer Types 1, 2; 8, 9 on cantilevers).

A single parabola between the two high points. With c_left = c_right = 0 the high points are at the support centrelines (Type 1 / centreline parabola); positive c_left / c_right move the high points inside the supports by those distances, with a straight tendon from each support to its high point (Type 2 / face-to-face parabola), which adds a downward point load at each high point.

Parameters:

  • e_left (float) – Tendon eccentricity (positive below the centroid) at the left high point, the parabola mid-point (low point), and the right high point.

  • e_mid (float) – Tendon eccentricity (positive below the centroid) at the left high point, the parabola mid-point (low point), and the right high point.

  • e_right (float) – Tendon eccentricity (positive below the centroid) at the left high point, the parabola mid-point (low point), and the right high point.

  • c_left (float) – Distance of each high point inside its support centreline (default 0).

  • c_right (float) – Distance of each high point inside its support centreline (default 0).

Methods

segments

Attributes

c_left

c_right

e_left

e_mid

e_right