S 6.1 with a longitudinal axis of the stirrup steel bar and the JPKIC general compression member 结构热计原黑 3.Longitudinal stability factor 1)Definition:slenderness ratio of members to consider the additional effect of increasing the calculation of bearing capacity reduction factor. 2)Calculation:=ps (6-1) p=zEl 6N (Euler's formula Damage to the critical long column capacity P =fcA+(Columns axis force at failure π2BE。.1 0= fed+fap 3)influencing factors:the slenderness ratio,column initial deflection,the eccentric vertical force is related to concrete strength,steel reinforcement ratio of their intensity level and less affected. 3.Longitudinal stability factor 1) Definition: slenderness ratio of members to consider the additional effect of increasing the calculation of bearing capacity reduction factor. 2) Calculation: =pl/ps (6-1) (6-2) 3) influencing factors: the slenderness ratio, column initial deflection, the eccentric vertical force is related to concrete strength, steel reinforcement ratio of their intensity level and less affected. (Columns axis force at failure (Euler' sformula Damage to the critical long column capacity 2 0 2 s s s l p fcA f A l EI p = +   = ）  2 1 ' ' 2 c 1 cd sd E f f      =  + § 6.1 with a longitudinal axis of the stirrup steel bar and the general compression member