Albarakah 165 ft Marquee

World PEB Studio

50.16m Ø Circular Structure • Ring-1 (2.15 Ton Crown) + 5-Part Rafters

Studio View Focus
Structural Layers
Rafter Segments 5 Prefab Pieces
RAF-1 (6,133 mm, Knee Haunch)
RAF-2 (6,134 mm, Straight)
RAF-3 (2,184 mm, Belly Drop)
RAF-4 (2,184 mm, Belly Rise)
RAF-5 (6,134 mm, Crown Span)
RAFTER BAY 1 PEB Member

Main Radial Rafter Truss

Built-up tapered I-section with dual moment haunches.

Cross-Section Makeup: ASTM A36
• Web: PL 5x300 (tapers to 600mm at haunches)
• Flanges: FL 8x191 (top & bottom continuous)
• Splices: PL 12x200 / PL 12x260 (bolted)
• Cleats: FL 6x140 (clp-1 for Z-purlins)
PEB Design Note:
Radial thrust is resolved via full-moment compression ring action at Ring-1, eliminating horizontal thrust onto outer columns.

Ring-1: 5.58m Ø Compression Crown Assembly

Master Pre-Engineered Building (PEB) Compression Ring Detailed in Tekla Structures (Weight: 2,153.90 kg)

Geometry & Diameter
5,580 mm OD
Outer Radius 2,790mm | Inner Radius 2,117mm | Radial Box Depth 673mm
Total Assembly Weight
2,153.90 kg
Single Shop-Welded Monolithic Crown Assembly (Grade A36 Steel)
Radial Thrust Equilibrium
Σ Fr = 0
20 balanced incoming radial rafter vectors resolve into pure circumferential hoop compression.

Fabrication Parts List for Ring-1 (Shop Drawing DWG pp. 1-2)

Mark Profile Size Description Grade Role in PEB Crown
Ring Plates PL 200x12 Continuous circular top & bottom plates A36 Flange hoop tension/compression
of-3 .. of-39 FL 8x191 Outer circular curved flange segments (R=2790) A36 Exterior circumferential boundary
if-5 .. if-39 FL 8x191 Inner circular curved flange segments (R=2117) A36 Interior compression throat
web-5 .. web-37 PL 5x300 20+ Radial diaphragm web plates (depth 300mm) A36 Direct rafter load transmission
web-38 & 39 PL 8x350 / 8x320 Reinforced heavy radial diaphragms A36 Critical shear transfer points
sp-2 PL 12x200 End rafter connection shoe plates A36 Bolted rafter-to-ring moment joint
clp-1 FL 6x140 Cleats with 4x14mmØ bolt holes A36 Purlin and strut connection tabs

Full Rafter Schedule: RAF-1 Through RAF-5

Segmented Pre-Engineered Tapered Rafter Design (20 Radial Bays, 22.77m Standard Segmented Length)

Mark Cut Slope Length Web Depth & Plate Flanges Haunch / Profile Function Qty (20 Bays)
RAF-1 6,133 mm Tapers 600mm -> 300mm (PL 5) FL 8x191 Column Knee Haunch (4,000mm moment span) 20 Nos.
RAF-2 6,134 mm Straight 300mm (PL 5x300) FL 8x191 Intermediate lower roof span 20 Nos.
RAF-3 2,184 mm Deepens 300mm -> 550mm (PL 5) FL 8x191 Mid-Span Belly Haunch Drop (at 15,244mm) 20 Nos.
RAF-4 2,184 mm Tapers 550mm -> 300mm (PL 5) FL 8x191 Mid-Span Belly Recovery Rise (4,368mm belly) 20 Nos.
RAF-5 6,134 mm Straight 300mm (PL 5x300) FL 8x191 Upper roof span to Crown Ring-1 20 Nos.
Apex Stub 174mm ~ 2,129mm Transition shoe plate (PL 12x200) FL 8x191 Variable stub to absorb site survey variations 20 Nos.
Dual Haunch Moment Optimization: PEB framing uses a 4.0m knee haunch to absorb high negative bending moments at the column junction, and a 4.368m belly haunch (RAF-3 + RAF-4) at mid-span where positive deflection and bending are maximized under marquee roof fabric tension and wind uplift.
Standardized Prefabrication: Every one of the 20 rafter lines uses the identical 22.769m 5-segment kit. Site eccentricity from misaligned concrete pedestals was absorbed entirely by customizing the apex end stub without altering the factory tooling of the main segments!

Complete 20-Column Concrete & Steel Audit

Full dimensional breakdown comparing surveyed as-built geometry with design & fabrication schedules.

Key Finding: The concrete pedestals are cast with severe radial eccentricity (1,601 mm maximum deviation) and uneven levels up to +65 mm above FFL. While the GA drawings specified custom clear heights (5209 to 5449 mm) to adapt to the bad concrete, the fabrication shop drawing shows all 9 pieces of COL-10 were detailed to a single uniform length of 5,384 mm, guaranteeing major site erection clashes.
# Grid / Location Column Tag Surveyed Radius Radial Dev. (ΔR) TOC Level Offset GA Clear Ht Fab Length Status Action
Severe Clash / Level Fault Moderate Fault Normal / Within Tolerance