Timber Structural Member with Alternating Fastener Angles
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Solution Overview
Problem
Timber structural members face challenges such as imperfections compromising strength, high demand on specific tree species, processing defects, and energy-intensive manufacturing of engineered wood composites, along with issues in joining and torsion restraints which can be prone to failure at elevated temperatures.
Innovation Solution
A structural member composed of two timber rounds with cooperating surfaces secured by fasteners at alternating acute and obtuse angles, using adhesive for encapsulation and reinforcement, and featuring radial cuts for angled connections, which reduces waste and maintains structural integrity while providing enhanced strength and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If solid timber is used for structural members, then natural strength and load-bearing capacity are achieved, but imperfections such as knots, rotting, and grain defects compromise structural integrity
Solution Approach 1:
The structural member is segmented into multiple layers of timber rounds bonded together, with each layer containing multiple rounds arranged in alternating patterns. This segmentation allows defects in individual rounds to be distributed and isolated, preventing a single imperfection from compromising the entire member's structural integrity.
Solution Approach 2:
The invention creates a composite timber structure by bonding multiple timber rounds together with adhesive in alternating patterns. This composite construction combines the natural strength of timber with the defect-distribution benefits of layered composition, achieving both high load-bearing capacity and reliable structural integrity.
2Reliability
If high quality lumber is selected to ensure strength, then structural reliability is improved, but production cost and resource consumption increase
Solution Approach 1:
The invention applies local quality by using varying grades and orientations of timber rounds in different layers and positions within the composite structure. Lower-grade timber with defects can be strategically placed in positions where defects are less critical, while higher-grade timber is used in critical load-bearing positions, optimizing both reliability and cost-effectiveness.
Solution Approach 2:
The segmented layered structure allows timber rounds with defects to be discarded or positioned in non-critical areas, while the overall structural integrity is maintained through the composite arrangement. This approach recovers value from timber that would otherwise be rejected due to localized defects.
3Ease of manufacture
If engineered wood composites are used instead of solid timber, then manufacturing cost is reduced and defect issues are eliminated, but energy consumption and processing requirements increase
Solution Approach 1:
The timber rounds are prepared in advance by cutting and shaping them to specific dimensions and orientations before assembly. This preliminary action allows for efficient use of raw timber with minimal processing during final assembly, reducing overall energy consumption compared to extensively processing engineered composites.
Solution Approach 2:
The natural grain structure and shape of the timber rounds serve their structural function directly, requiring minimal additional processing or bonding agents. The timber rounds self-align and interlock through their natural geometry, reducing the need for energy-intensive manufacturing processes.
4Ease of operation
If traditional joining methods with bearing surfaces are used, then ease of assembly is achieved, but additional torsion restraints are required which increase structural complexity
Solution Approach 1:
The invention merges the joining function and torsion resistance function into a single integrated alternating layer structure. The alternating arrangement of timber rounds in different orientations inherently provides torsional stiffness while maintaining simple assembly, eliminating the need for separate torsion restraint components.
5Stability of the object's composition
If metal braces are used for torsion restraint, then structural stability is improved, but fire resistance and oxidation resistance deteriorate
Solution Approach 1:
The invention extracts the torsion restraint function from metal braces and implements it through the alternating layer configuration of timber rounds themselves. This eliminates the need for metal components, providing inherent torsional stability while maintaining full fire and oxidation resistance of the timber structure.
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 solution offers a cost-effective, environmentally friendly alternative with reduced energy consumption, improved strength, and stability, capable of withstanding axial compression and transverse bending without additional torsion restraints, and is resistant to fire-induced destabilization.
Implementation Method 1
The first timber round is secured to the second timber round by a plurality of fasteners spaced along the length of the member
Data Source
AI summary
A timber structural member is provided. The structural member includes a first timber round having a first cooperating surface extending longitudinally along the length thereof, and a second timber round having a second cooperating surface extending longitudinally along the length thereof. The first cooperating surface is shaped to cooperate with the second cooperating surface and the two timber rounds are secured together to form a structurally integral unit in which the first cooperating surface is in contact with the second cooperating surface and the first timber round is substantially parallel to the second timber round. The first timber round is secured to the second timber round by a plurality of fasteners spaced along the length of the member, the plurality of fasteners including fasteners provided at both acute and obtuse angles from a longitudinal axis of the structural member.