Composite Open Web Beam-Joist for Lighter Structural Support
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Solution Overview
Problem
Traditional steel joists used in construction of large buildings are cumbersome and costly, and there is a need for a more efficient and economical beam-joist structure and manufacturing method.
Innovation Solution
A composite open web beam-joist is developed, comprising a cambered beam-joist with triangular web sections, chord angle beams, and a vertical plate, manufactured by cutting and bending a metal beam to form an open web layout, and attaching angle beams and a plate via welding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional steel joists are used in construction, then structural support is provided, but the structure becomes cumbersome and costly
Solution Approach 1:
The beam-joist structure is segmented into distinct functional components: a cambered beam-joist portion with triangular web sections for structural support, chord angle beams for lateral stability, and a vertical plate for bearing support. This segmentation allows each component to be optimized independently while simplifying the overall assembly process compared to traditional joists.
Solution Approach 2:
The invention employs a composite structure combining the cambered beam-joist portion made from metal beam with triangular web sections, chord angle beams attached at the peaks, and a vertical plate at the top end. This composite design integrates multiple structural elements into a unified assembly that provides enhanced strength while reducing complexity compared to traditional steel joist systems.
2Strength
If traditional steel joists are used in construction, then structural support is provided, but the construction cost increases
Solution Approach 1:
The cambered beam-joist portion is cambered (pre-bent) during manufacturing to the desired curvature before installation. The chord angle beams are pre-cut to match the triangular web section peaks, and the vertical plate is pre-positioned at the top end. This preliminary preparation of components significantly reduces on-site assembly time and labor costs while maintaining structural integrity.
Solution Approach 2:
The beam-joist portion is cambered to a specific curvature along its length, creating an arched profile that provides structural advantages. This curvature is built into the component during manufacturing, allowing it to span greater distances and support loads more efficiently than straight beams, thereby reducing the number of supports needed and lowering overall construction costs.
3Strength
If solid beam structure is used, then strength is maintained, but weight increases
Solution Approach 1:
The solid beam web is segmented into triangular web sections separated by openings. This segmentation removes unnecessary material while maintaining structural strength through the triangular configuration, which is inherently stable and efficient at distributing loads. The resulting open web structure significantly reduces weight compared to solid beams while preserving load-bearing capacity.
Solution Approach 2:
The beam-joist structure employs an open web layout with triangular openings throughout its length, creating a porous configuration. This porous structure reduces material usage and weight while the triangular web sections and chord angle beams provide sufficient structural strength. The vertical plate at the top end reinforces the bearing area, ensuring strength is maintained despite the reduced material volume.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The composite open web beam-joist provides enhanced structural integrity and reduces weight while facilitating installation of utilities, offering a cost-effective and efficient construction solution.
Implementation Method 1
attaching angle beams and a plate via welding
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.