Experimental Assessment of RC Beam-Column Connections with Internal and External Strengthening Techniques

Table 1

Characteristics of column-beam joint specimens.

Specimen ID

Column characteristics

Beam characteristics

Joint reinforcement

Retrofitting

Dimension

Longitudinal bars

Stirrups

ρl (%)

ρs (%)

Dimension

Longitudinal bars

Stirrups

ρl (%)

ρs (%)

Stirrups

In joint

In member

Target

300 × 300

4Ø20

Ø8/100

1.13

0.33

300 × 360

2Ø20 (top)

Ø8/100

1.13

0.33

2Ø10 (both directions)

—

—

3Ø20 (bottom)

1.69

Control

300 × 300

4Ø20

Ø8/100

1.13

0.33

300 × 360

2Ø20 (top)

Ø8/100

1.13

0.33

—

—

—

3Ø20 (bottom)

1.69

Sample 1

300 × 300

4Ø20

Ø8/300

1.13

0.11

300 × 360

2Ø20 (top)

Ø8/300

1.13

0.11

—

Externally retrofitted by CFRP

—

3Ø20 (bottom)

1.69

Sample 2

300 × 300

4Ø20

Ø8/300

1.13

0.11

300 × 360

2Ø20 (top)

Ø8/300

1.13

0.11

—

Internally retrofitted by 4Ø12 diagonal bars

—

3Ø20 (bottom)

1.69

Sample 3

300 × 300

4Ø20

Ø8/300

1.13

0.11

300 × 360

2Ø20 (top)

Ø8/300

1.13

0.11

—

Internally retrofitted by 4Ø12 diagonal bars

Externally retrofitted by CFRP

3Ø20 (bottom)

1.69

Sample 4

300 × 300

4Ø20

Ø8/300

1.13

0.11

300 × 360

2Ø20 (top)

Ø8/300

1.13

0.11

—

Externally retrofitted by CFRP

Externally retrofitted by CFRP

3Ø20 (bottom)

1.69