PSI - Issue 70

Alok Kumar et al. / Procedia Structural Integrity 70 (2025) 145–152

149

Table 4. Moment curvature curve of column S No. structure CFRP Layer

Yield curvature

Ultimate curvature

Curvature ductility=UC/YC

Max moment (kN-m)

% increase ductility

% increase moment (kNm)

1.

Original structure

0

0.0529

0.2455

4.64

238.4925

2.

2 wrapping structure 4 wrapping structure

2

0.0403

0.2502

6.201

241.3267

33.642

1.19

3.

4

0.0404

0.2599

6.433

243.662

38.642

2.17

4 6 wrapping structure

6

0.0405

0.2607

6.437

246.181

38.728

3.22

% increase curvature ductility

% increase moment

3.22%

0.00% 0.50% 1.00% 1.50% 2.00% 2.50% 3.00% 3.50%

30.00% 32.00% 34.00% 36.00% 38.00% 40.00%

38.73%

38.64%

2.17%

1.19%

33.64%

percentage

percentage

2 wrapping4 wrapping6 wrapping

2 wrapping 4 wrapping 6 wrapping

Fig. 9. % increase curvature ductility

Fig. 10. % increase moment

Moment curvature curve of column

100 150 200 250 300

original structure 2 wrapping structure 4 wrapping structure 6 wrapping structure

moment (kN-m)

0 50

0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

curvature radian per m

Fig. 11. Moment curvature curve of column

3.3 Result of Pushover analysis.

The present study explains how different seismic responses and the seismic exposure of the building vary with FRP retrofitting. The pushover curve is in one direction because the symmetrical plan is considered in the building. Following pushover analysis. The performance points of the original structure, 2 wrapping structures, 4 wrapping structures, and 6 wrapping structures were estimated using the equivalent linearization method.