PEB Design Process Explained: From Concept to Erection
Quick Answer
PEB design follows a structured sequence: defining functional requirements (span, height, crane loads), calculating applicable loads (dead, live, wind, seismic) per Indian design codes, optimizing steel sections to those loads using specialized software, and producing detailed fabrication drawings — all before a single piece of steel is cut.
Step 1: Functional Requirements
Design starts with the building's purpose, not its structure. How wide does the clear span need to be for the machinery or storage racking layout? What eave height accommodates the crane hook or stacking height? Does the layout need future expansion bays? These functional answers drive every structural decision that follows.
Step 2: Load Calculations
Indian PEB design follows codes like IS 800 (general steel construction) and IS 875 (wind, seismic and other loads), factoring in the specific wind-speed zone and seismic zone of the site. Telangana and coastal Andhra Pradesh have different governing wind and seismic considerations — a structure designed for Hyderabad isn't automatically adequate for a cyclone-exposed coastal site like Visakhapatnam or Kakinada without re-checking those load cases.
Step 3: Section Optimization
This is where PEB's main cost efficiency comes from. Rather than using standard rolled steel sections uniformly, PEB design software tapers built-up sections to match the actual bending-moment diagram along the frame — using more steel where load is highest and less where it isn't. This typically results in significantly less total steel tonnage than a conventional frame carrying the same load.
Step 4: Fabrication Drawings
The final design output is a set of detailed shop drawings specifying every member's dimensions, connection details and erection sequence — the exact instructions the fabrication team and erection crew work from.