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.