How to Design a Purlin/Girt Cleat Connection to AISC 360 (Step by Step, With Free Software)
A purlin cleat connection has to handle a truly signed reaction — wind uplift on a roof purlin puts the…
How to Design a Rectangular Water Tank to ACI 318 (Step by Step, With Free Software)
Each wall of a rectangular tank is designed as a one-way vertical cantilever under triangular hydrostatic pressure — exactly the…
Why Seismic Zones Are Mapped the Way They Are
Not Drawn From Political Boundaries — Drawn From Geology A seismic zone map looks like it's dividing a country into…
How to Design a Tie (Plinth) Beam to CSA A23.3 (Step by Step, With Free Software)
A tie beam carries two genuinely independent actions at once — ordinary bending and shear from the wall load it…
What Design Life Actually Means in a Structural Code
Not a Guarantee, a Design Target A code specifying a 50-year design life for an ordinary building doesn't mean the…
How to Design a Steel Truss to AS 4100 (Step by Step, With Free Software)
AS 4100 applies a single Section/Fabrication Category selection to both the chord and the diagonal of a truss — a…
Serviceability vs Strength: Why a ‘Safe’ Beam Can Still Fail the User
Two Limit States, Two Different Failure Definitions Modern design codes formally separate checks into ultimate limit states (collapse, instability, rupture…
How to Design an RCC Slab to NBR 6118 (Brazil) (Step by Step, With Free Software)
NBR 6118 doesn't publish its own two-way moment-coefficient table the way IS 456 or CSA A23.3 do — Brazilian practice…
How to Design a Gantry Girder to AISC 360 (Step by Step, With Free Software)
A crane gantry girder under AISC 360 checks biaxial bending with a really simple linear interaction — no axial term…
How to Design a Pedestal to ACI 318 (Step by Step, With Free Software)
ACI 318 defines a pedestal purely by geometry — a compression member with a clear height no more than three…