Complete pin joint - Complete pin joint

Japanese: 完全ピン節点 - かんぜんぴんせってん
Complete pin joint - Complete pin joint

...There are also n reaction forces, so the total number of unknowns is n + s 1 + 2 s 2 + 3 s 3. On the other hand, if there is k 1 perfect pin node (no two members are rigidly connected) and k 2 rigid nodes (at least two members are rigidly connected) out of the total k nodes ( k = k 1 + k 2 ), the former has equilibrium equations in the x and y directions, and the latter has an additional moment equilibrium equation. In other words, the total number of equilibrium equations is 2 k 1 + 3 k 2. ...

*Some of the terminology explanations that mention "perfect pin node" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…このほかに反力がn個あるので,未知数の数は合計ns1+2s2+3s3となる。一方,全部でk個ある節点のうちで完全ピン節点(どの2部材も剛接合でない)がk1個,剛節点(少なくとも2部材が剛接合である)がk2個あるとすると(kk1k2),前者ではx方向とy方向のつりあい式が,後者ではそのほかにモーメントのつりあい式が成立する。すなわちつりあい式の数は合計2k1+3k2である。…

※「完全ピン節点」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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