Steel Column Base Structure for Thin Plate Load Transfer
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Solution Overview
Problem
Existing column structures face challenges in efficiently exhibiting load-bearing ability while reducing the thickness dimension of the base member, and in effectively anchoring the column member to the base member to enhance structural stability.
Innovation Solution
The column structure incorporates a column member with a web and flanges integrated on both sides, anchored by first and second anchor members anchored in concrete, with the base member fixed to the anchor members in a configuration that optimizes load transmission and reduces base member thickness, including features like indented portions, connection portions, and projection portions to enhance stability and weight reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of stationary object
If the base member thickness is reduced to decrease weight, then the load-bearing ability and structural stability deteriorate
Solution Approach 1:
The base member is segmented into a plate portion and a rib portion that extend in different directions. The plate portion provides broad concrete contact area while the rib portion provides vertical anchoring capability, allowing the base member to be thinner overall while maintaining strength through distributed load paths.
Solution Approach 2:
The anchor members introduce a vertical dimension to the anchoring system, extending downward into the concrete foundation. This vertical anchoring dimension compensates for reduced base member thickness by providing load transfer path into the concrete, maintaining load-bearing ability despite thinner base plate.
2Weight of stationary object
If the base member thickness is reduced to decrease weight, then the horizontal displacement resistance deteriorates
Solution Approach 1:
The base member is segmented into a plate portion and a rib portion with different functional orientations. The plate portion resists horizontal displacement through broad concrete contact, while the rib portion provides vertical anchoring, together maintaining stability despite reduced overall thickness.
Solution Approach 2:
The rib portion extends vertically into the concrete, adding a vertical dimension to the anchoring system. This vertical anchoring capability compensates for reduced horizontal thickness, maintaining horizontal displacement resistance through three-dimensional load distribution.
3Strength
If anchor members are added to improve load transmission, then the device complexity increases
Solution Approach 1:
The anchor members serve multiple functions: they provide vertical anchoring into concrete, resist horizontal displacement, and facilitate load transmission from the base member to the foundation. This multi-functionality justifies the added complexity by consolidating multiple structural requirements into single components.
Solution Approach 2:
The anchor members extend the structural system into the vertical dimension by anchoring into the concrete foundation. This adds a new spatial dimension to load transmission, enabling efficient force transfer downward into the foundation while also providing lateral stability.
Data Source
AI summary
In a column structure, a steel column having a web and flanges integrally provided to both sides in a width direction of the web is welded to a base plate. First anchor bolts and second anchor bolts are anchored in foundation concrete. The base plate is fixed to the first anchor bolts at an opposite side to the web with respect to the flanges, and fixed to the second anchor bolts at a web side with respect to the flanges. The load bearing ability of a column setup can therefore be efficiently exhibited, and a thickness dimension of the base plate can be reduced.