Composite Beam With Embedded Truss Reinforcement
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Solution Overview
Problem
Existing composite beams, such as the steel plate fabricated composite beam, face challenges with section rigidity, construction load support, and durability due to exposed steel plates, which complicate construction and increase costs and construction time.
Innovation Solution
A flush type fabricated truss composite beam is developed, featuring a fabricated truss with a lower chord, folding type web members, and upper chords, combined using screw rods and D cones, integrated with a sheathing board that is removable after concrete curing, eliminating the need for external supports and enhancing durability and refractory properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a thin steel plate (about 6 mm thickness) is used to form a U-shaped permanent form composite beam, then the construction complexity is reduced and no separate form is needed, but the section rigidity becomes very small and it cannot support construction loads
Solution Approach 1:
The steel structure is divided into multiple segments: U-shaped steel plates for formwork, separate steel beams for structural support, and individual reinforcing bars for concrete reinforcement. This segmentation allows each component to perform its specific function optimally - the U-shaped plates provide formwork without needing high rigidity, while the steel beams provide the necessary structural support.
Solution Approach 2:
The patent combines multiple functions into a unified composite structure: the U-shaped steel plates serve as both permanent formwork and part of the composite beam, steel beams provide structural support, and concrete fills the U-shaped section to create a composite member. This merging allows the thin steel plates to be used without compromising overall structural integrity.
2Ease of manufacture
If steel plates are exposed to the outside in a composite beam, then the construction process is simplified, but the durability and refractory properties deteriorate
Solution Approach 1:
Concrete acts as an intermediary material that protects the exposed steel plates from environmental damage. The concrete fills the U-shaped steel section and creates a protective cover, preventing direct exposure of the steel to weather, fire, and corrosion while maintaining the simplified construction process of using exposed steel formwork.
3Strength
If supports are placed at intermediate places of the steel plate unit during construction, then the construction load can be supported, but the construction period cannot be saved and site operability is reduced
Solution Approach 1:
The U-shaped steel plates and steel beams are assembled into a complete framework structure before concrete pouring. This preliminary assembly creates a self-supporting structure that can bear construction loads without requiring additional intermediate supports, thereby saving construction time and improving site operability.
4Strength
If a steel beam and concrete are combined to form a composite beam, then the resistance strength and rigidity are increased for long-span construction, but the material cost is higher than reinforced concrete structure
Solution Approach 1:
The U-shaped steel plates serve multiple functions: they act as permanent formwork eliminating the need for separate formwork, provide structural support as part of the composite beam, and serve as reinforcement for the concrete. This multi-functionality reduces the total amount of steel material needed compared to traditional steel beams, thereby reducing material costs while maintaining high strength and rigidity.
Data Source
AI summary
The present invention relates to a composite beam in which a fabricated truss is embedded in the concrete, and more particularly, it relates to a composite beam in which the fabricated truss acts as a truss beam which endures the concrete weight and the construction load in the liquid phase before the curing of the concrete and acts as a main structural member together with the concrete after the curing of the concrete.