Slit Base Plate for Column Rotation and Foundation Reduction
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Solution Overview
Problem
Mid-to-low rise buildings face increased costs due to the need for larger and deeper concrete foundations to achieve sufficient rigidity, while conventional column base structures with pin-connected designs are expensive and require precision machining.
Innovation Solution
A column base structure featuring a base plate with slits surrounding the anchor bolt, allowing for rotational deformation and reducing bending moments, which is simpler and less costly than conventional pin-connected structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of stationary object
If a conventional pin-connected structure is used to reduce bending moments, then the foundation size can be reduced, but the manufacturing cost and complexity increase due to precision machining requirements
Solution Approach 1:
The invention changes the structural parameters of the base plate by introducing slits that create a deformable configuration. This allows the base plate to rotate and accommodate pin-connected behavior without requiring precision-machined pin holes or specialized components. The slits transform the rigid base plate into a semi-flexible structure that can deform elastically, achieving the rotational capability needed for pin-connected behavior while using conventional manufacturing methods.
2Ease of manufacture
If steel-made column bodies with standardized products are used, then manufacturing is simplified, but the rigidity becomes surplus to requirements for mid-to-low rise buildings
Solution Approach 1:
The invention applies local quality by concentrating the rigidity enhancement at the critical location - the base plate connection to the foundation. The base plate is designed with slits that create a specific deformable zone, while the rest of the structure can use standardized, lighter steel components. This localized reinforcement allows the use of standardized column bodies and beams with sufficient but not excessive rigidity, optimizing the overall structure for mid-to-low rise buildings.
3Stability of the object's composition
If the foundation is made larger and deeper to achieve sufficient rigidity, then the structural stability improves, but the construction cost increases
Solution Approach 1:
The invention changes the mechanical parameters of the column-base-foundation system by introducing a deformable base plate configuration. The slits in the base plate allow it to rotate and deform elastically under load, transforming the rigid connection into a semi-flexible one. This parameter change reduces the bending moments transmitted to the foundation, allowing for a smaller and less deep foundation while maintaining structural stability through controlled deformation rather than pure rigidity.
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 proposed structure reduces the size and depth of foundations, decreases the amount of steel required, and maintains sufficient rigidity for column bodies and beams, resulting in an inexpensive and efficient column base design.
Implementation Method 1
the slits formed in the base plate help the base plate to deform easily and the column base to rotationally deform easily
Data Source
AI summary
A column body (3) is, for example, an H steel column. Abase plate (5) is joined to the lower end of the column body (3). Anchor bolts (9) are inserted into a foundation (7) and are fixed thereto. Slits (13a), (13b) are provided in the base plate (5). The slits (13a), (13b) are formed in mutually different directions. The slits (13a), (13b) are formed so as to surround the anchor bolts (9) (holes of the base plate (5)). More specifically, the anchor bolts (9) are surrounded from a plurality of directions by the slits (13a), (13b) formed in a plurality of different directions.