| 摘要 |
PROBLEM TO BE SOLVED: To reinforce a frame at a weak part of a structurally weak strength where a stress load is easy to be concentrated, and improve an ultrimate strength of the whole body of a truss. SOLUTION: In a dome-shaped truss type framed structural body, five frames 20A-20E are connected to a columnar hub 3a to form a truss joint of framework of a trapezoidal mesh in a strength wise weak point. One frame 20A, of the frame 20A-20E, which is directed to a dome top part is connected to the columnar hub 3a through an adapter 31, and the other frames 20B-20E are directly connected to it. The adapter 31 comprises two hub connection parts 34 to be fitted with two mutually adjacent connection grooves 8 of the hub 3a, and one frame connection groove 37 with which a connection end part 5 of the frame 20A is fitted. A bend angleβof the connection end part 5 of the frame 20A can thus be set small.
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