Timber Portal Frame Connector Reducing Thermal Bridging

Resolve Bottlenecks,
Find Innovative Solutions
Generate Solutions

Solution Overview

Problem

Existing portal frames in timber constructions face challenges with thermal bridging, differential shrinkage between steel and timber components, increased construction costs, and complexity due to bespoke foundations required for steel portal frames, which compromise energy efficiency and structural integrity.

Innovation Solution

A portal frame constructed using wood or wood-based materials with a frame connector system that includes a lateral header connecting portion and a column connecting portion, allowing for rigid connections between the header and columns without enveloping the ends, thereby reducing thermal bridging and differential movements, and simplifying the foundation requirements.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If steel portal frames are used in timber framed constructions, then structural strength and rigidity are improved, but thermal bridging occurs which reduces energy efficiency

Engineering Contradiction:
Improvestructural strengthVSAvoidenergy efficiency
Core Design Contradiction:
StrengthVSLoss of energy

Solution Approach 1:

The patent applies homogeneity by using timber materials for both the portal frame structure and the connecting components. The frame connector is made of timber or timber-based material, matching the header and column materials, thereby eliminating thermal bridges between dissimilar materials and maintaining uniform thermal performance throughout the structure.

Inventive Principle:
Principle #33Homogeneity

Solution Approach 2:

The patent employs composite materials by using engineered timber products such as laminated veneer lumber (LVL) or glulam for the header and columns, and timber-based composite materials for the frame connector. These composite timber materials provide enhanced structural strength while maintaining thermal compatibility, resolving the contradiction between strength requirements and energy efficiency.

Inventive Principle:
Principle #40Composite materials

2Stability of the object's composition

If steel portal frames are used, then structural rigidity is improved, but detrimental relative movements occur due to differential shrinkage between steel and timber components

Engineering Contradiction:
Improvestructural rigidityVSAvoidstructural integrity
Core Design Contradiction:
Stability of the object's compositionVSReliability

Solution Approach 1:

The patent uses timber or timber-based materials for the frame connector, header, and columns, ensuring all components have identical shrinkage characteristics. This material homogeneity eliminates differential movement problems that occur when steel and timber are combined, as all timber components shrink and expand uniformly in response to moisture changes.

Inventive Principle:
Principle #33Homogeneity

Solution Approach 2:

The patent addresses dimensional stability by selecting timber materials with controlled moisture content and using engineered wood products that have stabilized dimensional properties. The frame connector and timber members are designed to accommodate natural timber movement through appropriate connection geometry and fastening methods, maintaining structural integrity despite environmental variations.

Inventive Principle:
Principle #35Parameter changes

3Strength

If steel portal frames are used, then construction cost increases, but structural performance is improved

Engineering Contradiction:
Improvestructural performanceVSAvoidconstruction cost
Core Design Contradiction:
StrengthVSEase of manufacture

Solution Approach 1:

The patent eliminates steel components entirely by using timber or timber-based materials for the frame connector, header, and columns. This material uniformity simplifies the construction process, allows standard timber fabrication techniques, and eliminates the need for specialized steel-timber connection details, thereby reducing construction costs while maintaining structural performance through properly designed timber-to-timber connections.

Inventive Principle:
Principle #33Homogeneity

Solution Approach 2:

The patent employs cost-effective timber materials that can be readily sourced and fabricated using conventional woodworking methods. The frame connector and timber members use economical fastening systems such as metal plates, screws, or dowels that are inexpensive and easy to install, providing a cost-efficient alternative to expensive steel portal frames while achieving the required structural performance.

Inventive Principle:
Principle #27Cheap short-living objects (Disposable)

4Force

If steel portal frames are used, then lateral load resistance is improved, but foundation complexity increases due to bespoke construction requirements

Engineering Contradiction:
Improvelateral load resistanceVSAvoidfoundation complexity
Core Design Contradiction:
ForceVSDevice complexity

Solution Approach 1:

The patent uses timber materials for the entire portal frame structure, including the frame connector, header, and columns. This homogeneity allows the foundation design to follow standard timber frame construction practices rather than requiring specialized foundations for steel-timber composite structures. The timber members can be directly anchored to conventional foundation systems using standard holdowns and anchor bolts, simplifying the overall foundation design and construction process.

Inventive Principle:
Principle #33Homogeneity

Data Source

PatentUS9759005B2Portal frame
Publication Date: 2017.09.12 SIMPSON STRONG TIE
  • US9759005B2 patent drawing
  • US9759005B2 patent drawing
  • US9759005B2 patent drawing

AI summary

A portal frame comprising at least one header, at least a first column, at least one frame connector for rigidly connecting the at least first column to the at least one header, at least one header fastener configured to fasten the frame connector to the at least one header and at least one column fastener configured to fasten the frame connector to the at least first column. The at least first column is formed of wood or a wood-based/wood-derived material. The at least one frame connector comprises a lateral header connecting portion extending beyond a lateral edge of the first column in a direction towards the center of the at least one header and a column connecting portion extending along at least a portion of the height of the at least first column. The lateral header connecting portion comprises at least one of the at least one header fastening means.