文档介绍：第3章钢筋混凝土构件的基本受力性能
Basic Mechanical Behavior of RC Members
第3章钢筋混凝土构件的基本受力性能
轴心受拉性能轴心受拉性能
BehaviorBehavior ofof uniaxialuniaxial tensiletensile RCRC membermember
轴心受压性能轴心受压性能
BehaviorBehavior ofof pressive RCRC membermember
梁的受弯性能梁的受弯性能
FlexuralFlexural behaviorbehavior ofof RCRC beambeam
第3章钢筋混凝土构件的基本受力性能
Questions:Questions:
. HowHow toto predictpredict thethe behaviorbehavior ofof RCRC member?member?
. WhatWhat aboutabout thethe influenceinfluence ofof thethe materialmaterial
propertiesproperties ofof steelsteel andand concreteconcrete onon thethe behaviorbehavior
ofof RCRC member?member?
. WhatWhat aboutabout thethe influenceinfluence ofof thethe amountamount ratioratio ofof
steelsteel toto concreteconcrete onon thethe behaviorbehavior ofof RCRC member?member?
. HowHow toto determinedetermine thethe maximummaximum loadload carryingcarrying
capacitycapacity ofof RCRC members?members?
. HowHow toto determinedetermine thethe effecteffect ofof shrinkageshrinkage andand
creepcreep ofof concreteconcrete onon thethe behaviorbehavior ofof RCRC
member?member?
MechanicalMechanical PropertiesProperties
ofof RCRC ElementElement
ConcreteConcrete + ReinforcementReinforcement
StressStress--StrainStrain ConsistentConsistent StressStress--StrainStrain
RelationRelation ConditionCondition RelationRelation
AnalysisAnalysis EquilibriumEquilibrium InIn FullFull LoadingLoading
StepStep byby StepStep EquationEquation ProcedureProcedure
第3章钢筋混凝土构件的基本受力性能
轴心受拉构件的受力性能轴心受拉构件的受力性能
(Behavior of Uniaxial Tensile Member)
NN
Ac
As
轴心受拉构件的受力性能
第3章钢筋混凝土构件的基本受力性能
◆开裂前 N<Ncr εs =εc =ε
◎几何条件Consistent Condition N
εs =εc =ε
◎物理关系 Stress-strain Relationship
σ
σ= E ε= E ε E α
s s s s = s σ= E σ
s νE c ν c
σ c = Ec′εc =νEcε c
σc
N
◎平衡条件 Equilibrium Condition
σs
N = σ A +σ A
c c s s σ
σαα
⎛ E ⎞⎛ρ E ⎞
= c ⎜ Ac + As ⎟= c Ac ⎜1+ ⎟
⎝ν⎠⎝ν⎠
ρ=As/Ac 配筋率(Reinforcement Ratio)