Adjustable bolted steel plate connection
An adjustable structural connection can be used to join steel structural elements at a range of angles and is capable of adjusting in situ to accommodate additional angles or tolerances through cold bending. Pre-bent plate or plates may be loosely fitted around steel structural elements, such that holes in the plates align with holes of the steel structural elements. Placing bolts through the aligned holes and tightening those bolts can be used to cold bend the plate or plates and conform the angle of the pre-bent plates to a different angle defined by an apex joint of two steel structural elements. Specific tightening procedures may be employed.
1. An adjustable structural connection comprising:
a top plate bent along a first longitudinal centerline by a first angle forming a first end and a second end, wherein the top plate includes a front hole at the first end and a front hole at the second end; and
a bottom plate bent along a second longitudinal centerline by a second angle forming a first end and a second end, wherein the bottom plate includes a hole at the first end and a hole at the second end, wherein
when the first longitudinal centerline and the second longitudinal centerline are substantially aligned along a vertical axis,
the front hole at the first end of the top plate vertically overlaps the hole at the first end of the bottom plate, and
the front hole at the second end of the top plate vertically overlaps the hole at the second end of the bottom plate, and
wherein a tightening bolt is placed through each of the vertically overlapping holes of the top plate and bottom plate that, when tightened, cause the top plate to bend along the first longitudinal centerline by a third angle and cause the bottom plate to bend along the second longitudinal centerline by the third angle.
2. The adjustable structural connection of claim 1 , wherein the top plate further includes a back hole at the first end and a back hole at the second end, wherein the bottom plate is a front bottom plate, and wherein the adjustable structural connection further comprises:
a back bottom plate bent along a third longitudinal centerline by a fourth angle forming a first end and a second end, wherein the back bottom plate includes a hole at the first end and a hole at the second end, wherein
when the second longitudinal centerline and the third longitudinal centerline are substantially aligned along a vertical axis,
the back hole at the first end of the top plate vertically overlaps the hole at the first end of the back bottom plate, and
the back hole at the second end of the top plate vertically overlaps the hole at the second end of the back bottom plate, and
wherein a tightening bolt is placed through each of the vertically overlapping holes of the top plate and back bottom plate that, when tightened, cause the top plate to bend along the first longitudinal centerline by the third angle and cause the back bottom plate to bend along the third longitudinal centerline by the third angle.
3. The adjustable structural connection of claim 1 , wherein the top plate and the bottom plate are steel plates.
4. The adjustable structural connection of claim 1 , wherein the holes of the top plate and the bottom plate have a diameter between ⅝ inches and 1 inch.
5. The adjustable structural connection of claim 1 , wherein the top plate and the bottom plate have a thickness of ⅜ inches to 1 inch.
6. The adjustable structural connection of claim 1 , wherein a distance between the front hole at the first end of the top plate and an edge of the first end of the top plate is 1 inch to 4 inches.
7. The adjustable structural connection of claim 1 , wherein the first angle is an angle between 0° and 15°.
8. The adjustable structural connection of claim 2 , wherein the back bottom plate is a steel plate.
9. The adjustable structural connection of claim 3 , wherein the top plate is cold bent.
10. The adjustable structural connection of claim 3 , wherein the top plate is cold bent via a press brake.
11. An adjustable structural connection assembly comprising:
a plurality of adjustable structural connections, each comprising:
a top plate bent along a first longitudinal centerline by a first initial angle forming a first end and a second end, wherein the top plate includes a front hole at the first end and a front hole at the second end; and
a bottom plate bent along a second longitudinal centerline by a second initial angle forming a first end and a second end, wherein the bottom plate includes a hole at the first end and a hole at the second end, wherein
when the first longitudinal centerline and the second longitudinal centerline are substantially aligned along a vertical axis,
the front hole at the first end of the top plate vertically overlaps the hole at the first end of the bottom plate, and
the front hole at the second end of the top plate vertically overlaps the hole at the second end of the bottom plate, and
wherein tightening bolts placed through each of the vertically overlapping holes of the top plate and bottom plate, when tightened around a joint having a joint angle that is different from the first initial angle and the second initial angle, cause the top plate to bend along the first longitudinal centerline by the joint angle and cause the bottom plate to bend along the second longitudinal centerline by the joint angle;
wherein each adjustable structural connection is operable to be fitted to joints within a respective range of angles that includes angles above or below the respective initial angle by a threshold amount.
12. The adjustable structural connection assembly of claim 11 , wherein the ranges of angles collectively define a set of joint angles to which one or more of the adjustable structural connections is operable to be fitted.