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
JPKIC 结构设计原理 Theprimepletstricturedesio S 6.1 with a longitudinal axis of the stirrup steel bar and the general compression member 4.Calculation of bearing capacity <Highway Bridge Specifications>,provides the force with a longitudinal axis of the stirrup steel bar and the general cross-section bearing capacity of compression members is calculated as ≤YoNa N=0.9ofaA+faA） Column ordinary hoops Calculation of bearing capacity and strength of sub-section design review two cases. 1)section design Given section size,length 10,axial compressive strength of concrete and steel design value of compressive strength,axial pressure combined design value,find the required area of longitudinal reinforcement. 2)Review Section Given section size,length 10,all cross-sectional area of longitudinal reinforcement,the axial compressive strength of concrete and steel design value of compressive strength,mix design value of axial force,find the section bearing capacity
4.Calculation of bearing capacity 《Highway Bridge Specifications》, provides the force with a longitudinal axis of the stirrup steel bar and the general cross-section bearing capacity of compression members is calculated as ≤ (6-3) Column ordinary hoops Calculation of bearing capacity and strength of sub-section design review two cases. 1) section design Given section size, length l0, axial compressive strength of concrete and steel design value of compressive strength, axial pressure combined design value, find the required area of longitudinal reinforcement. 2) Review Section Given section size, length l0, all cross-sectional area of longitudinal reinforcement, the axial compressive strength of concrete and steel design value of compressive strength, mix design value of axial force, find the section bearing capacity. 0 Nd ( ) ' ' 0.9 u cd s d As N = f A + f § 6.1 with a longitudinal axis of the stirrup steel bar and the general compression member