Chapter 5 Members resisting bending
Chapter 5 Members resisting bending
● 5.1 Behavior 5.1.1 Behavior of singly reinforced beam 应变计 。位移计吊 f (a) (b) (c) (d) (e) (f) (g) M<Mcr Mcr >Mcr My >My Mu M<Mu
• 5.1 Behavior 5.1.1 Behavior of singly reinforced beam M<Mcr Mcr >Mcr My >My Mu M<Mu
录相资料 > Under reinforced beam Over reinforced beam
录相资料 Under reinforced beam Over reinforced beam
对 1/P a~b before cracking b cracking d yield of rebar f ultimate load capacity
a～b before cracking b cracking d yield of rebar f ultimate load capacity
5.2 Analysis methods 5.2.1 Basic assumptions .Plane cross section remain plane during bending(Bernoulli assumption) .There is full bond between concrete and steel .Concrete behavior in the compressive zone is described by an uniaxial stress-strain curve .The tensile strength of concrete is ignored .The behavior of steel is described by the stress-strain curves for steel in compression or tension .Failure accurse when the strain of concrete of the extreme compressive fiber attains a critical value su usually taken to be equal to 0.0033
5.2 Analysis methods • 5.2.1 Basic assumptions •Plane cross section remain plane during bending (Bernoulli assumption) •There is full bond between concrete and steel •Concrete behavior in the compressive zone is described by an uniaxial stress-strain curve •The tensile strength of concrete is ignored •The behavior of steel is described by the stress-strain curves for steel in compression or tension •Failure accurse when the strain of concrete of the extreme compressive fiber attains a critical value εu usually taken to be equal to 0.0033