JPKIC 结构设计原理 Teprimepledtstmicturgdesign Chapter 6 轴心受压构件承载力计算 Calculation to Carrying Capacity of Members under Axial Loading
Chapter 6 轴心受压构件承载力计算 Calculation to Carrying Capacity of Members under Axial Loading
JPKic 箱构试原黑 Main content of this chapter ● With a longitudinal axis of steel stirrups and the general failure mode of compression members,bearing capacity; Longitudinal and spiral reinforcement with stirrups failure modes of axial compression members,bearing capacity; The concept of stability factor and its influencing factors; Analysis of the core concrete strength and strength calculation; Ordinary hoops column,spiral column reinforcement stirrup features and construction requirements
Main content of this chapter ● With a longitudinal axis of steel stirrups and the general failure mode of compression members, bearing capacity; ● Longitudinal and spiral reinforcement with stirrups failure modes of axial compression members, bearing capacity; ● The concept of stability factor and its influencing factors; ● Analysis of the core concrete strength and strength calculation; ● Ordinary hoops column, spiral column reinforcement stirrup features and construction requirements
JPKIC 结构设计原理 Theprinepletstrmicturgdesign 6.1 with a longitudinal axis of the stirrup steel bar and the general com pression member 1.Classification of reinforced concrete columns Ordinary hoops column:longitudinal reinforcement and stirrups with the column,(Figure 6-1a). oSpiral hoop column:with a longitudinal reinforcement and spiral reinforcement rings or bars welded column,(Figure 6-1b). Of which:to help compression longitudinal reinforcement,bending away from the commitment to prevent brittle failure.Spiral reinforcement component to improve strength and ductility
§ 6.1 with a longitudinal axis of the stirrup steel bar and the general compression member 1.Classification of reinforced concrete columns ⚫ Ordinary hoops column: longitudinal reinforcement and stirrups with the column, (Figure 6-1a). ⚫ Spiral hoop column: with a longitudinal reinforcement and spiral reinforcement rings or bars welded column, (Figure 6-1b). Of which: to help compression longitudinal reinforcement, bending away from the commitment to prevent brittle failure. Spiral reinforcement component to improve strength and ductility
JIPKIC 构试原黑 S 6.1 with a longitudinal axis of the stirrup steel bar and the general compression member B) 纵向钢筋 纵向钢筋 箍筋 螺旋箍筋 Figure 6-1 axis of two reinforced concrete compression members a)ordinary hoops column b)screw hoops column
纵向钢筋 ) 纵向钢筋 箍筋 螺旋箍筋 ) Figure 6-1 axis of two reinforced concrete compression members a) ordinary hoops column b) screw hoops column § 6.1 with a longitudinal axis of the stirrup steel bar and the general compression member
IPKIC 结构设计原理 6.1 with a longitudinal axis of the stirrup steel bar and the genera compression member 2.Failure modes 1)factors: (1)creep: So that the sudden increase of steel stress,concrete stress reduction (stress re-distribution) Sudden unloading of concrete will have tensile stress. (2)The slenderness ratio:(lo/b) 2)Failure of ordinary hoops column (1)short column damage -material damage. Failure characteristics:longitudinal cracks,longitudinal reinforcement muster, concrete crack. (2)destruction of long columns -unstable failure Failure characteristics:first,the concave side was crushed concrete,concrete surface longitudinal cracks;convex side of the pressure suddenly changed from tension,transverse cracks appear;destruction before the horizontal deflection increased rapidly rather sudden destruction come,leading to instability Damage Carrying capacity is less than the same cross section,reinforcement,material columns
2. Failure modes 1) factors: (1) creep: ●So that the sudden increase of steel stress, concrete stress reduction (stress re-distribution) ●Sudden unloading of concrete will have tensile stress. (2) The slenderness ratio: (l0/b) 2) Failure of ordinary hoops column (1) short column damage - material damage. Failure characteristics: longitudinal cracks, longitudinal reinforcement muster, concrete crack. (2) destruction of long columns - unstable failure Failure characteristics: first, the concave side was crushed concrete, concrete surface longitudinal cracks; convex side of the pressure suddenly changed from tension, transverse cracks appear; destruction before the horizontal deflection increased rapidly rather sudden destruction come, leading to instability Damage. Carrying capacity is less than the same cross section, reinforcement, material columns. § 6.1 with a longitudinal axis of the stirrup steel bar and the general compression member