Weak-beam/Strong-column Requirements

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26 Νοε 2013 (πριν από 3 χρόνια και 22 μέρες)

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Strong
-
column/weak
-
beam

MOMENT
FRAME
BEHAVIOR

SEAOC
Blue
Book

1999

STRONG
-
COLUMN,
WEAK BEAM

Blue Book

Commentary

C402.5

GLOBAL STRONG
-
COLUMN, WEAK
-
BEAM

Formula is based on the sum of moment strengths
for the columns and beams framing into a level.

S

M
n

Columns
below



S

M
n

Beam left and right


M
B

M
B

M
B

M
B

M
B

M
B

M
C

M
C

M
C

M
C

Takitori 100%

RUTHERFORD & CHEKENE

Mild Steel

Unbonded post
-
tensioned
tendons

Fiber reinforced
grout pad

HYBRID Beam
-
Column connection

Courtesy of Ms. S. Nakaki

Diagonal strut and bond
stress transfer joint shear

Compression force in
concrete and mild steel

Tension force in
mild steel

q
des

Tension force in
prestressing
steel

Hybrid System Mechanism

Courtesy of Ms. S. Nakaki

Weak pier story mechanism

Plastic analysis


SEAOC seismic design
examples, Volume 3

Dual system

Desired
mechanism

RUTHERFORD & CHEKENE

Undesirable
mechanism