| CPC G06F 30/17 (2020.01) | 1 Claim |
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1. A method for preparing a small-scale model of a buckling-controlled brace device with a rotationally symmetric cross section, wherein the small-scale model of the buckling-controlled brace device with the rotationally symmetric cross section comprises an energy-dissipation segment, the energy-dissipation segment comprises four groups of sub-energy-dissipation segments connected end to end in turn in a circumferential direction, a basic unit of the sub-energy-dissipation segments after flattening comprises two congruent parallelograms connected by overlapping edges, three edges of the parallelograms in a horizontal direction are all divided into two unequal lengths, both top and bottom edges are connected to overlapping edges by edges with the same length, and finally forming sixteen edges; a shape of the basic unit of the sub-energy-dissipation segments after flattening is two identical first parallelogram HAFG and second parallelogram GFEJ, in the first parallelogram, first, second, third and fourth edges correspond to line segment HA, line segment AF, line segment FG and line segment GH respectively, in the second parallelogram, fifth, sixth, seventh and eighth edges correspond to line segment GF, line segment FE, line segment EJ and line segment JG respectively, wherein the third edge and the fifth edge overlap, that is, the line segment FG is the line segment GF; point B, point C and point D are located on the line segment HA, the line segment FG and the line segment EJ, respectively, that is, the first edge line segment HA is divided into ninth edge line segment HB and tenth edge line segment BA connected to an end of the ninth edge line segment HB, third edge line segment FG is divided into eleventh edge line segment GC and twelfth edge line segment CF connected to an end of the eleventh edge line segment GC, a seventh edge line segment EJ is divided into a thirteenth edge line segment JD and a fourteenth edge line segment DE connected to an end of the thirteenth edge line segment JD; length of the ninth edge line segment HB, the twelfth edge line segment CF, and the thirteenth edge line segment JD is greater than length of the tenth edge line segment BA, the eleventh edge line segment GC, and the fourteenth edge line segment DE, respectively; the lengths of the ninth edge line segment HB, the twelfth edge line segment CF and the thirteenth edge line segment JD are all equal; and the ninth edge line segment HB is connected to the twelfth edge line segment CF through a fifteenth edge line segment BC, and the thirteenth edge line segment JD is connected to the twelfth edge line segment CF through a sixteenth edge line segment DC, and a length of the fifteenth edge line segment BC is equal to a length of the sixteenth edge line segment DC; in the basic unit of the sub-energy-dissipation segments after flattening, performing a valley fold at the fourth and eighth edges, and performing a hill fold at fifteenth and sixteenth edges, to form a basic origami unit, and the preparation method comprises following steps:
S100. a computer numerical control (CNC) machine tool cuts into the sub-energy-dissipation segments on a flat steel plate along a panel group I and a panel group II split by the fifteenth and sixteenth edges, wherein the panel group I comprises a ninth edge, the fifteenth edge, the sixteenth edge, a thirteenth edge, the eighth edge, a eleventh edge and the fourth edge; and the panel group II comprises a tenth edge, the second edge, the sixth edge, a fourteenth edge, the sixteenth edge, a twelfth edge and the fifteenth edge;
S200. connecting the panel group I and the panel group II in S100 by oblique hill creases, to form the sub-energy-dissipation segments; and
S300. connecting the four groups of sub-energy-dissipation segments in S200 along a direction of the eleventh edge, to form an energy-dissipation segment of a rotationally symmetric tubular structure;
in S100, using horizontal creases in an interior of the panel group I and the panel group II, wherein the horizontal creases only transfer displacement and do not transfer out-of-plane bending moment;
a preparation method of the horizontal creases comprises:
S110. continuously and evenly drilling the horizontal creases on the panel group I and the panel group II into several circular holes;
S120. locally annealing the horizontal creases of the circular holes by an acetylene flame, to compensate for a loss of deformation capacity caused by a weakening of the cross section; and
S130. after completing the annealing, accurately bending the panel group I and the panel group II to a specified angle along the horizontal creases by a CNC bending machine;
in S200, the oblique hill creases only transfer the displacement and do not transfer the out-of-plane bending moment;
a preparation method of the oblique hill creases comprises:
S210. bending a first connecting plate with a first preformed clearance hole to a specified angle by the CNC bending machine;
S220. placing two adjacent panels of the panel group I and the panel group II with a preformed first pilot hole in a hill shape, and placing the first connecting plate on a hill side;
S230. arranging a first cushion plate with a second preformed clearance hole on the hill side of the first connecting plate; and
S240. when assembling, installing a first self-tapping screw from outside to inside with a drill, passing through the second preformed clearance hole on the first cushion plate and the first preformed clearance hole on the first connecting plate in turn via self-tapping screw threads, and forming a drilled hole at the first pilot hole on the two adjacent panels of the panel group I and the panel group II, to make the screw threads bite tightly with sides of the drilled hole;
in S300, a connection between the four groups of sub-energy-dissipation segments is oblique valley creases, and the oblique valley creases transfer displacement and out-of-plane bending moment simultaneously;
a preparation method of the oblique valley creases comprises:
S310. bending a second connecting plate with a third preformed clearance hole to a specified angle by the CNC bending machine;
S320. placing the two adjacent panels with a preformed second pilot hole of the panel group I and the panel group II in a valley shape, and placing the second connecting plate on a valley side;
S330. arranging a second cushion plate with a fourth preformed clearance hole on a valley side of the second connecting plate; and
S340. when assembling, installing a second self-tapping screw from outside to inside with a drill, passing through the fourth preformed clearance hole on the second cushion plate and the third preformed clearance hole on the second connecting plate in turn via self-tapping screw threads, and forming a drilled hole at the second pilot hole on the two adjacent panels of the panel group I and the panel group II, to make the screw threads bite tightly with the sides of the drilled hole.
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