To have these macros available in Hurmet.app, copy this text into a Hurmet calculation zone
macros = import("https://gist.githubusercontent.com/ronkok/317f8ce0f706608fa9b3e3258ecea138/raw/csMacros.txt") = !
Then, write a macro name, place the selection point after the name, and hit Alt-E.
Mnemonic: Area of Bolt
Prerequisite: db, diameter of bolt
Entry:
¢` A_b = (π d_b^2) / 4 = ?? in² `, bolt area
Mnemonic: Area of Steel required for Concrete beams
Prerequisites:
| Name | Description |
|---|---|
| fc′ | prescribed concrete strength, psi |
| fc′′ | ditto, psi² |
| b | width |
| d | depth to reinforcement |
| fyr | yield strength of steel reinforcement |
| Mu | strength level bending demand |
| ρT | max reinf ratio for which ρ may be 0.9 |
Entry:
Find required reinforcing steel, ¢` A_sMin `
¢` x_c = (0.85 f_c′ b d) / f_yr = ?? in² `, parameter for next line of calculation
¢` A_1 = x_c - √(x_c² - (2 x_c M_u) / (0.9 d f_yr)) = ?? in² `, from CRSI Report 22
¢` A_2 = (b d· max(200 'psi', 3 √f_c′′)) / f_yr = ?? in² `, per ACI 10.5
¢` A_sMin = min(max(A_1, A_2), 1.33 A_1) = ? in² `
¢` A_sUsualMax = b d ρ_T = ?? in² `, maximum reinf ratio for which ¢` ϕ_b ` may be 0.9
¢` @test A_sMin < A_sUsualMax `
Description: Bending strength of a concrete beam.
Prerequisites:
| Name | Description |
|---|---|
| As | area of reinforcing steel |
| b | width |
| d | depth to reinforcement |
| fc′ | prescribed concrete strength, psi |
| fyr | yield strength of steel reinforcement |
Entry:
¢` a = (A_s f_yr) / (0.85 f_c′ b) = ?? in `, depth of Whitney stress block
¢` ϕM_n = 0.9 A_s f_yr (d - a//2) = ?? k·ft `, beam strength