Thermal Decoupling in Concrete Columns Using Lightweight Insulation
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Solution Overview
Problem
Existing load-bearing concrete building components, such as columns and exterior walls, face challenges in thermal bridging and structural instability due to monolithic connections with thermal insulation, leading to unsatisfactory structural results and reduced space utilization, particularly in underground garages.
Innovation Solution
A load-bearing vertical building component, like a column, incorporates a thermal insulation element made of lightweight concrete with fiber composite reinforcement bars, providing thermal decoupling and stress-damping properties to distribute loads evenly and reduce heat transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If monolithic connection with continuous reinforcement is used to connect floor slab to load-bearing columns, then load-bearing connection is achieved, but thermal bridges are created that are difficult to eliminate
Solution Approach 1:
The column is divided into two distinct sections: a lower section made of normal-weight concrete for load-bearing purposes, and an upper section made of lightweight thermal insulation material for thermal isolation. This segmentation allows the structure to simultaneously achieve load-bearing capacity and thermal break functionality, eliminating the thermal bridge problem while maintaining structural integrity.
Solution Approach 2:
Different materials with specific properties are used in different locations: normal-weight concrete with high compressive strength is used in the lower section where load-bearing is critical, while lightweight insulation material with low thermal conductivity is used in the upper section where thermal isolation is prioritized. This local differentiation of material properties resolves the contradiction between structural strength and thermal performance.
2Loss of energy
If thermal insulation is applied to encase the upper section of load-bearing columns, then thermal bridging is reduced, but structural stability is compromised and parking space is reduced
Solution Approach 1:
The column is segmented into a load-bearing lower section and an insulating upper section, allowing each part to fulfill its primary function without compromising the other. The lower section maintains full structural capacity while the upper section provides thermal isolation, achieving both goals simultaneously without the need to encase the entire column in insulation.
Solution Approach 2:
The upper section of the column serves dual functions: it provides thermal insulation to break heat transfer paths, and simultaneously acts as a load-bearing element through its integration with the reinforcement system. The reinforcement bars extend through both sections, enabling the insulation material to contribute to structural stability while maintaining its thermal isolation function.
3Loss of energy
If contact area between building elements is reduced to reduce heat transfer, then thermal insulation is improved, but the risk of punching failure increases due to concentrated force
Solution Approach 1:
The support surface area is locally increased at the interface between the floor slab and the column's lower section, where punching resistance is critical. This local expansion of the contact area distributes the concentrated loads effectively, preventing punching failure while maintaining the overall thermal insulation performance provided by the upper insulation section.
4Force
If compression elements are used for vertical connection, then load transfer is achieved, but support rotation and settlement can cause overloading and chain failure
Solution Approach 1:
The reinforcement system serves multiple functions: it transfers compressive loads from the floor slab to the column, provides tensile reinforcement to accommodate support rotation and settlement, and maintains the integrity of the thermal break. The reinforcement bars extend through both the normal-weight concrete and lightweight insulation sections, creating a continuous load path that accommodates structural movements without causing chain failure.
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 effectively reduces heat transfer by up to 90% and minimizes the risk of structural failure by distributing loads, ensuring stable and efficient thermal insulation and structural integrity.
Implementation Method 1
an area forming the thermal insulation element is made of lightweight concrete, which is compressive force-transmitting and thermally insulating
Implementation Method 2
thermal insulation element for thermal decoupling between the vertical building part and the horizontal building part to be constructed above or below
Implementation Method 3
the reinforcing bars extending beyond the upper support surface consist of a fiber composite material and extend essentially vertically through the first region of the vertical building part forming the thermal insulation element
Data Source
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AI summary
In the case of a load-bearing, vertical building element made of concrete, in particular a column, with an upper bearing surface for load-bearing connection to a horizontal building element to be constructed above it, in particular a floor slab, in which the vertical building element has reinforcement with one or more reinforcing bars extending substantially vertically beyond the upper bearing surface, the invention provides that an upper area of the vertical building element adjacent to the upper bearing surface is designed as a thermal insulation element for thermal decoupling between the vertical building element and the horizontal building element to be constructed above it, and that the upper area forming the thermal insulation element consists at least partially of a compressive force-transmitting and thermally insulating material, in particular lightweight concrete.and that the reinforcing bars extending beyond the upper bearing surface are made of a fiber composite material and extend essentially vertically through the upper area of the vertical building section, which forms the thermal insulation element, into a lower area of the vertical building section below, in which it is constructed of reinforced concrete.