Composite Open-Web Beam-Joist for Lower-Cost Steel-Concrete Floors
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Solution Overview
Problem
Current steel-supported concrete floor and roof construction methods in commercial buildings are inefficient and costly, as they rely on traditional steel joists that require complex installation and materials, lacking a superior beam-joist structure for large-scale construction.
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, manufactured through cutting, cambering, and welding processes to create a more efficient and cost-effective structural element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional steel joists with open-web design are used, then structural strength is achieved, but manufacturing complexity and installation cost increase
Solution Approach 1:
The beam-joist is divided into modular components including pre-fabricated truss sections, bearing plates, and connection elements that can be manufactured separately and assembled systematically, reducing overall manufacturing complexity while maintaining structural integrity
Solution Approach 2:
The design employs composite construction combining steel components with concrete bearing surfaces, creating a hybrid structure that leverages the strengths of both materials to achieve required load-bearing capacity with simplified fabrication processes
2Force
If traditional steel joists with seat angles are used, then bearing capacity is achieved, but material cost and installation time increase
Solution Approach 1:
Bearing plates and connection elements are pre-fabricated and pre-positioned during manufacturing, allowing for faster on-site assembly and reducing installation time while maintaining adequate bearing capacity through pre-engineered connection details
Solution Approach 2:
Multiple functional elements including bearing surfaces, connection plates, and structural members are merged into integrated components that perform multiple functions simultaneously, reducing the number of separate parts to install and overall construction time
3Stability of the object's composition
If complex steel joist assemblies are used, then structural integrity is achieved, but material cost increases
Solution Approach 1:
Complex structural details and reinforcement are concentrated only at critical locations such as bearing points and connection zones, while span sections use simpler, more economical profiles, optimizing material usage and reducing overall cost while maintaining structural integrity
Solution Approach 2:
Non-essential decorative or redundant structural elements are removed from the design, retaining only the minimum required components to achieve necessary structural performance, thereby reducing material quantities and cost
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.