Seismic Isolation Design Project by Cindy Angelina

Cindy Angelina

Seismic Isolation Design Project

2021

Introduction Presented here is one of my final projects for the seismic isolation and mitigation class of civil engineering department during my master’s degree at National Cheng Kung University, Taiwan.

an isolation system with Lead Rubber Bearing (LRB) and steel dampers.

The programs used for the design are PISA and ETABS. The final conclusion can bee seen in the performance comparison and cost estimation at the end of the slides. For this 4-storey office building simulation, the most effective option is to use LRB and steel dampers with the calculated configuration.

LET’S GET STARTED

N E X T

The objective of this project is to design seismic-resistant building using

Target Building q 4-story office building q 4 m floor to floor

q Fy 420 MPa

q Dead load: 0.8 tom/m2 (mass source)

q Box 500 x 500 x 20 mm

q Live load: 0.3 ton /m2 (mass source)

q RH 600 x 200 x 11 x 17 mm

N E X T

Basic Information

Superstructure without isolation Vertical load Isolation system (LRB) REQUIREMENT 1: Axial stress of LRB < 10/mm2 REQUIREMENT 2: Max. deformation of LRB < 0.64 diameter

REQUIREMENT 3: Inter-storydrift < 0.67% radian

OK

Using LRB only

N E X T

OK

NOT OK

STEEL DAMPER

NOT OK

Project Objective

Relative Displacement (mm) 16

16

14

14

12

12

10

10

8

8

6

6

4

4

2

2

0 0

20

40

60

N E X T

Superstructure Performance without Isolation System

Inter-storydrift (%)

0 0.00

0.50

1.00

Height (m)

Relative Displacement (mm)

Height (m)

Inter-storydrift (%)

16

22.85

16

0.57

12

37.15

12

0.93

8

48.79

8

1.24

4

49.55

4

1.22

0

0.00

0

0.00

1.50

Lead Rubber Bearing Specification Number of LRB

Lateral Stiffness (kN/mm)

Max Deform (m)

Fy (kN/mm2)

400

9

0.46

0.256

51

500

7

0.57

0.320

64

600

5

0.69

0.384

77

N E X T

Type

Steel Damper

N E X T

Lead Rubber Bearing

q q q q

Type UD 55 x 4 Qdy 304 Kd (kN/mm) 9.6 Udy 31.67

Performance Comparison

LRB

LRB + Steel Damper

Maximum lateral displacement (mm)

54.78

37.79

18.09

Peak of relative displacement (mm)

49.55

18.09

17.35

Peak of inter-storydrift (% rad)

1.24

0.45

0.42

Peak of base shear (kN)

11,460.00

4,173

3,793

Peak of velocity (mm/s)

301.8

1,112.0

562.6

Peak of acceleration (mm/sec2)

4,700

6,519

5,456

Unit price (unit)

Amount

Price

Steel damper

20

6

120

LRB 400

16

9

144

LRB 500

25

7

175

LRB 600

36

5

180

Total cost (unit)

619

Cost Estimation

N E X T

Without Isolation

THANK YOU.