1

-500 -300 -100 100 300 500 -0.04 -0.02 0 0.02 0.04 Effect of Bracing Connections on the Cyclic Loading Behavior of Steel Chevron Braced Frames Laboratory of Architectural Structural Engineering HOKKAIDO UNIVERSITY Spec. 1, 2, 3 Typical in Japan / bolted Spec. 4 Recommended in U.S. / welded - Background - - Experiment - Connections Spec. 1 Spec. 2 Spec. 3 Spec. 4 H 1 H 2 H 1 H 2 -0.04 H 1 H 2 400 H 1 H 2 Spec. 1 Spec. 2 Spec. 3 Spec. 4 Story Shear force (kN) Story-Drift Ratio (rad) 0 200 400 -200 -400 0 200 400 -200 -400 0 -0.04 -0.02 0.02 0.04 0 -0.04 -0.02 0.02 0.04 0 -0.04 -0.02 0.02 0.04 0 -0.04 -0.02 0.02 0.04 N c H 1 N y N u H 2 - Results - - Analysis - Model of Spec. 1 Story Shear force (kN) Story-Drift Ratio (rad) - Objectives - Spec. 1: Bent in flat plate Damage from past earthquakes Frame test (Hokkaido Univ.) Member test (Kobe Univ.) ・To examine system behavior ・To compare various bracing connections in use ・To validate design strength against experimental response Specimen 2,300 ○76.3×4.2 (STK400) 1,500 1,500 BCR-200×200×9 H-250×125×6×9 Out-of-plane bracing Spec. 2: Braces deformed independently Spec. 3: Braces interacted with each other N y : Yield Strength N c : Buckling Strength N u : Post-Buckling Compression Strength 0 Analysis Experiment Brace: Circular hollow section Slenderness Ratio:107 D/t :18.2 Spec. 4: Braces deformed independently ・ Stable hysteresis up to large story drift of ±0.03 rad. ・ Degree of fixity at bracing connection has limited effect on system performance Brace & bracing connection identical -5 0 5 10 15 20 25 30 -100 -50 0 50 100 Under Beam Deformation (mm) Story-Drift Displacement (mm) Analysis Experiment

UNIVERSITY of Steel Chevron Braced Frames …labs.eng.hokudai.ac.jp/labo/1-ko/english/wp-content/...-500 -300 -100 100 300 500 -0.04 -0.02 0 0.02 0.04 Effect of Bracing Connections

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Page 1: UNIVERSITY of Steel Chevron Braced Frames …labs.eng.hokudai.ac.jp/labo/1-ko/english/wp-content/...-500 -300 -100 100 300 500 -0.04 -0.02 0 0.02 0.04 Effect of Bracing Connections

-500

-300

-100

100

300

500

-0.04 -0.02 0 0.02 0.04

Effect of Bracing Connections on the Cyclic Loading Behavior

of Steel Chevron Braced Frames

Laboratory

of Architectural

Structural Engineering

HOKKAIDO

UNIVERSITY

Spec. 1, 2, 3 Typical in Japan / bolted Spec. 4 Recommended in U.S. / welded

- Background -

- Experiment -

Connections

Spec. 1 Spec. 2

Spec. 3 Spec. 4

-400

-300

-200

-100

0

100

200

300

400

-0.04 -0.03 -0.02 -0.01 0 0.01 0.02 0.03 0.04

層せん断力

(kN

)

層間変形角 (rad)

H1

H2

-400

-300

-200

-100

0

100

200

300

400

-0.04 -0.03 -0.02 -0.01 0 0.01 0.02 0.03 0.04

層せん断力

(kN

)

層間変形角 (rad)

H1

H2

-400

-300

-200

-100

0

100

200

300

400

-0.04 -0.03 -0.02 -0.01 0 0.01 0.02 0.03 0.04

層せん断力

(kN

)

層間変形角 (rad)

H1

H2

-400

-300

-200

-100

0

100

200

300

400

-0.04 -0.03 -0.02 -0.01 0 0.01 0.02 0.03 0.04

層せん断力

(kN

)

層間変形角 (rad)

H1

H2

Spec. 1 Spec. 2

Spec. 3 Spec. 4

Sto

ry S

hea

r fo

rce

(kN

)

Story-Drift Ratio (rad)

0

200

400

-200

-400

0

200

400

-200

-400

0 -0.04 -0.02 0.02 0.04 0 -0.04 -0.02 0.02 0.04

0 -0.04 -0.02 0.02 0.04 0 -0.04 -0.02 0.02 0.04

Nc

H1

Ny Nu

H2

- Results -

- Analysis -

Model of Spec. 1

Sto

ry S

hea

r fo

rce

(kN

)

Story-Drift Ratio (rad)

- Objectives -

Spec. 1: Bent in flat plate

Damage from past earthquakes

Frame test (Hokkaido Univ.)

Member test (Kobe Univ.)

・To examine system behavior ・To compare various bracing connections in use ・To validate design strength against experimental response

Specimen

2,3

00

○76.3×4.2

(STK400)

1,500 1,500

BC

R-2

00×

20

0×

9 H-250×125×6×9

Out-of-plane bracing

Spec. 2: Braces deformed independently

Spec. 3: Braces interacted with each other Ny : Yield Strength

Nc : Buckling Strength

Nu : Post-Buckling Compression Strength

0

Analysis

Experiment

Brace: Circular hollow section Slenderness Ratio:107 D/t :18.2

Spec. 4: Braces deformed independently

・ Stable hysteresis up to large story drift of ±0.03 rad.

・ Degree of fixity at bracing connection has limited effect on system performance

Brace & bracing connection identical

-5

0

5

10

15

20

25

30

-100 -50 0 50 100

Un

der

Bea

m

Def

orm

atio

n (

mm

)

Story-Drift Displacement (mm)

Analysis

Experiment

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