Lura:

1) A_CA cikin pre-tension F_pzuwa 0.1C_aAxial kaya F ne 0.3C_alokacin da ka'idar lissafi darajar;

2) Lokacin da axial load F ba daidai da 0.3C_alokacin,

Tsarin

K_cne m darajar a cikin tebur;

4)Wannan nau'in ball dunƙula mataimaki dace da amfani a cikin high zafi yanayi;

4)Akwai bukatun musamman da za a yi a lokacin yin oda.