Structural beam joint, comprising: a first structural beam having a web portion and at least one first flange portion (23; 24); a second structural beam having at least one second flange portion, the second structural beam having an axis of extension being angled with respect to the axis of extension of the first structural beam and intersecting with the first structural beam; at least one beam flange clamp comprising a clamp body having: a first vise jaw portion with a first gripping surface, a second vise jaw portion with a second gripping surface, the first gripping surface and the second gripping surface being oriented parallel to each other and offset in height by a predetermined clamping distance (d), a bolting portion protruding from the second vise jaw portion opposite of the first vise jaw portion, and at least one bolting hole is formed through the bolting portion; and at least one fastening pin or bolt inserted in the at least one bolting hole of the at least one beam flange clamp, the at least one first flange portion (23; 24) of the first structural beam abutting the at least one second flange portion of the second structural beam, and the at least one fastening pin or bolt tightening the clamp body of the at least one beam flange clamp to the web portion of the first structural beam so that the clamp body sandwiches the at least one second flange portion of the second structural beam between the at least one first flange portion (23; 24) of the first structural beam and the first gripping surface of the at least one beam flange clamp. a first structural beam having a web portion and at least one first flange portion (23; 24); a second structural beam having at least one second flange portion, the second structural beam having an axis of extension being angled with respect to the axis of extension of the first structural beam and intersecting with the first structural beam; at least one beam flange clamp comprising a clamp body having: a first vise jaw portion with a first gripping surface, a second vise jaw portion with a second gripping surface, the first gripping surface and the second gripping surface being oriented parallel to each other and offset in height by a predetermined clamping distance (d), a bolting portion protruding from the second vise jaw portion opposite of the first vise jaw portion, and at least one bolting hole is formed through the bolting portion; and a first vise jaw portion with a first gripping surface, a second vise jaw portion with a second gripping surface, the first gripping surface and the second gripping surface being oriented parallel to each other and offset in height by a predetermined clamping distance (d), a bolting portion protruding from the second vise jaw portion opposite of the first vise jaw portion, and at least one bolting hole is formed through the bolting portion; and at least one fastening pin or bolt inserted in the at least one bolting hole of the at least one beam flange clamp, the at least one first flange portion (23; 24) of the first structural beam abutting the at least one second flange portion of the second structural beam, and the at least one fastening pin or bolt tightening the clamp body of the at least one beam flange clamp to the web portion of the first structural beam so that the clamp body sandwiches the at least one second flange portion of the second structural beam between the at least one first flange portion (23; 24) of the first structural beam and the first gripping surface of the at least one beam flange clamp.