Device for evaluating torsional structural performance of girder

A device for evaluating torsional structural performance of girder by inducing a torsional moment, the device comprising:

• a rotating member to twist the girder while rotating such that a center of rotation matches a shear center of the girder by a pressing force applied from above;
• a press member to press down on one or the other upper side of the rotating member;
• and
• a support member to rotatably support the rotating member pressed by the press member,
• wherein the rotating member includes a sliding unit at a lower part, and the sliding unit is formed in a shape of an arc having its center that matches the shear center of the girder,
• wherein the support member includes a guide unit at an upper part, and the guide unit is formed in an arc shape conforming to that of the sliding unit to slidably support the sliding unit in a direction of rotation,
• wherein the support member includes:
• grooves formed on the upper surface of the guide unit along the circumferential direction;
• and
• a plurality of roll members which rotates with parts being insert into the grooves to support the sliding unit,
• wherein the support member includes an anti-escape member coupled to two ends of the guide unit to close two sides of the grooves of the circumferential direction in order to prevent the roll members from escaping in a lateral direction.