Girder Torsion Testing Guide Unit Aligning Shear Center
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Solution Overview
Problem
Existing devices for evaluating torsional structural performance of girders face safety issues due to the escape of rotating members under rotational force and fail to measure accurate angles of twist, as the shear center of the girder does not match the center of torsion during rotation.
Innovation Solution
A device with a rotating member supported by a guide unit shaped like an arc matching the shear center of the girder, combined with a press member and a support member featuring a sliding unit, friction buffer, and anti-escape mechanisms to ensure accurate twist measurement and prevent member escape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a rotating member is used to twist the girder by rotating ends in different directions, then torsional moment is induced for testing, but the rotating member may escape due to rotational force causing safety issues
Solution Approach 1:
A guide unit is introduced as an intermediary component between the rotating member and the bearing member. The guide unit includes a guide groove that constrains the rotating member, preventing escape while allowing rotation. This mediator resolves the contradiction by enabling torsional testing capability while ensuring safety through the guide groove constraint mechanism.
2Strength
If rotating members are used to twist the girder, then torsional testing is performed, but the shear center moves and does not match the center of torsion, resulting in inaccurate angle of twist measurement
Solution Approach 1:
The guide groove in the guide unit is designed with an asymmetric curved path that compensates for the movement of the shear center during rotation. The groove's geometry is specifically configured to guide the rotating member such that the effective rotation center aligns with the shear center of the girder cross-section, ensuring accurate angle of twist measurement despite the asymmetric loading conditions.
Solution Approach 2:
The guide groove follows a curved path rather than a straight line, allowing the rotating member to trace an arc that accommodates the movement of the shear center. This curved guidance path ensures that the rotation occurs about the correct center point, maintaining measurement accuracy throughout the torsional testing process.
Data Source
AI summary
In a device for evaluating torsional structural performance of girder according to an embodiment of the present disclosure, a guide unit of a support member formed in a shape of an arc having its center that matches a shear center of the girder rotatably supports a rotating member, so that the shear center of the girder matches a center of torsion during clockwise or counterclockwise rotation of the rotating member, thereby measuring an accurate angle of twist and preventing an incident in which the rotating member escapes due to separation of a component by a rotational force.