Porous tube cell, porous tube structure, and method for designing same

A porous tube cell, comprising two circumferential structures, two radial structures, an intermediate structure and a plurality of connecting rods, wherein each of the two circumferential structures comprises a plurality of circumferential units, each of the plurality of the circumferential units comprises a first vertical rod and four first diagonal braces, the four first diagonal braces are arc-shaped rods, one end of the first vertical rod is fixedly connected with one end of each of two of the four first diagonal braces, and an other end of the first vertical rod is fixedly connected with one end of each of other two of the four first diagonal braces;

• each of the two radial structures comprises a plurality of radial units, each of the plurality of radial units comprises a second vertical rod and four second diagonal braces, one end of the second vertical rod is fixedly connected with one end of each of two of the four second diagonal braces, and an other end of the second vertical rod is fixedly connected with one end of each of other two of the four second diagonal braces;
• the intermediate structure comprises a plurality of intermediate frames arranged in sequence in a vertical direction, each of the plurality of intermediate frames comprises a third vertical rod, two third diagonal braces and two fourth diagonal braces, one end of each of the two third diagonal braces and one end of each of the two fourth diagonal braces are fixedly connected with the third vertical rod;
• one of the two circumferential structures, one of the two radial structures, another one of the two circumferential structures and another one of the two radial structures are arranged in sequence around the intermediate structure and connected by the plurality of connecting rods to form a frame structure, each of the plurality of circumferential units forms an inner ring and an outer ring of the frame structure, each of the plurality of radial units extends in a radial direction of the frame structure, a projection of the frame structure on a plane perpendicular to the first vertical rod in a vertical direction is an annular sector, an end of each of the two third diagonal braces away from the third vertical rod is fixedly connected with the second vertical rod, an end of each of the two fourth diagonal braces away from the third vertical rod is fixedly connected with the first vertical rod, and one end of each of the plurality of connecting rods is fixedly connected with an end of a corresponding one of the four first diagonal braces away from the first vertical rod, and an other end of each of the plurality of connecting rods is fixedly connected with an end of a corresponding one of the four second diagonal braces away from the second vertical rod;
• an angle between each of the four first diagonal braces and the first vertical rod is different from an angle between each of the four second diagonal braces and the second vertical rod, and an angle between each of the two third diagonal braces and the third vertical rod is different from an angle between each of the two fourth diagonal braces and the third vertical rod.