4.1受弯构件演示.ppt

文档介绍：Load
Reinforced Concrete Beam
Shortens
Lengthens
Compression
Tension
Compression
Tension
Shortens
Lengthens
Compression
Tension
Concrete pressive loads
Steel carries tensile loads
Tension zone
Load
Reinforced Concrete Beam
+M
-M
+ Bending
- Bending
Shear
-M
LL+DL
Load+++
Flexural / bination cracks
Flexural cracks (+M)
Shearcracks
Flexuralcracks (-M)
()LL
+ ()DL
= Ultimate
Load- Deflection Curve
Load (Lbs.)
Steel “Yields”
Deflection (in.)
Y”
X lbs
Lengthens
Tension
Steel carries tensile loads
Yield
F
F
F
F
F
F
F
F
Rubber (low)
Rebar (high)
Load- Deflection Curve
Load (Lbs.)
Steel “Yields”
Deflection (in.)
Y”
X lbs
Concrete Crushing