Composite Open-Web Beam Joist for Simpler Steel-Concrete Construction
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Solution Overview
Problem
Current steel-supported concrete construction methods in large buildings are inefficient and costly, as they rely on traditional steel joists with complex manufacturing processes and limited structural enhancements.
Innovation Solution
A composite open web beam joist design featuring a cambered beam-joist with triangular web sections, chord angle beams, and a vertical plate, along with a method of manufacturing that involves cutting, cambering, and welding these components to create a more efficient and cost-effective structural element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional steel joists with complex manufacturing processes are used, then structural integrity is maintained, but manufacturing complexity and cost increase
Solution Approach 1:
The beam-joist is divided into modular components including pre-fabricated steel beams with integrated web openings, allowing standardized manufacturing and assembly. The joist system segments the structural function into beam supports and joist spans, simplifying both manufacturing and installation processes while maintaining structural integrity
Solution Approach 2:
The steel beams are designed with multi-functionality, serving as both structural support elements and integrated bearing surfaces for joists. The web openings provide multiple functions including utility passageways and reduced material usage, while the angle iron configurations simultaneously provide structural strength and bearing surfaces, reducing the need for separate components
2Ease of manufacture
If traditional steel joists are used, then structural capabilities are maintained, but cost increases
Solution Approach 1:
The design utilizes parameter changes in the beam geometry, specifically varying the web opening patterns and angle iron configurations to optimize structural performance. The cambered configuration of joists and strategic placement of triangular web sections alter load distribution parameters, achieving enhanced structural capability with reduced material quantities and lower manufacturing costs
3Adaptability or versatility
If open web layout is used, then utilities integration is easier, but structural strength may be reduced
Solution Approach 1:
The open web layout implements local quality by strategically positioning web openings and triangular sections at specific locations where utility passage is needed, while maintaining solid web sections at critical load-bearing areas. This localized approach to web configuration provides utility access where required without compromising overall structural strength
Solution Approach 2:
The joist system employs composite construction combining steel angle irons in specific configurations to create triangular web sections that provide both structural strength and open spaces for utilities. The composite arrangement of structural elements creates a system that simultaneously achieves structural integrity and utility integration capability
Data Source
AI summary
A composite open web beam joist includes a cambered beam joist portion including a top end, a bottom end, a first side, a second side, and an open web layout extending from end to end. The open web layout includes triangular web sections and openings between each of the triangular web sections. Each triangular web section includes a peak. A first chord angle beam is attached to the first side of the cambered beam-joist portion at the peaks of the triangular web sections. A second chord angle beam is attached to the second side of the cambered beam-joist at the peaks of the triangular web sections. A plate is vertically attached to a center of the top end of the cambered beam-joist. The plate extended longitudinally along the center of the top end of the cambered beam joist portion. The plate includes a distal end having a flange and a recess.