Column Shoe Back Bond Means for Eccentric Force
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Solution Overview
Problem
Column shoes used for attaching concrete columns to foundations experience internal horizontal forces that lead to structural instability and harmful bending stresses due to eccentric positioning of main bonds and bolts, causing the column shoe to detach from the concrete column.
Innovation Solution
The column shoe design incorporates horizontal and vertical back bond means attached to the side plate, which connect the column shoe to the concrete column, mitigating the effects of compressive and tensile forces and preventing harmful eccentricity-induced stress by forming a solid structural connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If main bond means and bolt are disposed eccentrically relative to one another, then the column shoe can transmit vertical forces, but harmful bending moment is induced that tends to release the lower edge of the column shoe from the concrete column
Solution Approach 1:
The patent introduces back bond means extending in the horizontal direction (another dimension) from the bolt casing to the concrete column. This dimensional extension creates a counterbalancing moment arm that offsets the harmful bending moment generated by eccentric vertical force transmission, thereby reducing bending stress on the column shoe while maintaining vertical load capacity.
2Strength
If the bolt joining the column shoe is under tensile force, then the column shoe can be attached, but the upper edge of the bolt casing tends to release itself from the concrete column due to eccentric moment
Solution Approach 1:
The back bond means acts as an intermediary element between the bolt casing and the concrete column. It transfers and distributes the tensile forces and eccentric moments from the bolt connection to a broader area of the concrete column, preventing localized stress concentration that would cause the upper edge of the bolt casing to release from the column.
3Reliability
If horizontal back bond means and vertical back bond means are added to connect the column shoe to the concrete column, then structural stability is improved, but device complexity increases
Solution Approach 1:
The patent merges the back bond means with the existing bolt casing structure. The back bond means are integrated as extensions or attachments to the bolt casing components rather than being completely separate elements, thereby improving structural stability while minimizing the increase in overall device complexity through unified design.
Data Source
Figure 1
Figure 2~3
AI summary
Column shoe (1) for attaching concrete columns to a foundation or to another concrete column, said column shoe (1) comprising a bolt casing (2) with an open side, said bolt casing (2) comprising a side plate (5) forming the side of the bolt casing (2), said side plate (5) comprising an opening (11) for attaching a nut, a bottom plate (3) forming the bottom of the bolt casing (2), said bottom plate (3) comprising a bolt hole (10), and a top plate (4) forming the top of the bolt casing (2). The column shoe (1) further comprises at least one main bond means (6) attached to bolt casing (2) for attaching the column shoe (1) and the concrete column to each other. The column shoe (1) additionally comprises at least one horizontal back bond means (8) attached to the outer surface of the side plate (5) at two points (9). The part of the horizontal back bond means (8) between the attachment points (9) is located at a distance from the side plate (5). The column shoe (1) comprises a vertical back bond means (7) attached to the horizontal back bond means (8) between the attachment points (9) so that the vertical back bond means (7) is located between the horizontal back bond means (8) and the side plate (5).