13. Friction Damper
14
Friction Damper for
Tension–Compression
BracePall Friction Dampers
Energy is absorbed by surfaces with friction between them against each other
15. Yielding Damper
16
Plastic Deformation (Yielding) of metal absorb significant amount of seismic energy.
But I am sure you don’t want such kind of deformation of the structure after the earthquake.
Even if the structure is not collapsed totally, the building must be demolished for the future safety
16. Yielding Damper
17Honeycomb Damper System
Energy is absorbed by deformation of the metal
Metallic Yielding-Friction Damper (MYFD)
Before
After
23. Taipei 101 TMD
24
The largest damper sphere in the world, consists of
41 circular steel plates of varying diameters, each
125 mm (4.92 in) thick, welded together to form a
5.5 m (18 ft.) diameter sphere.
24. 25
Halving the Shaking Due to Long-Period Earthquake Ground Motion at Shinjuku Mitsui Building
Japan’s First Rooftop-Installed Ultra-Large Vibration Control Device (Approx. 1,800 tons)
Shinjuku Mitsui Building
30. Tokyo Skytree, Japan
31A reinforced concrete core runs through the heart of the structure
core-wall construction to increase seismic performance at lower cost.
35. Building elevation control (Cont;)
36
Transamerica Pyramid
building in San Francisco,
California
Ryugyong Hotel
Pyongyang, North Korea
Burj Khalifa, Dubai, UAE
36. Seismic Invisibility Cloak• Concentric plastic rings are
installed underground in the
top if three feet if soil.
• Harder layers are further
from the building. Each time
the wave hits a softer layer it
is deflected off its initial
path.
• Once past the building the
wave can continue on their
path.
37
37. 38
Test of Seismic Invisibility Cloaks
Alluvial basin in southern France
• The French team created its so-called metamaterial by drilling three lines of empty boreholes 5 metres
deep in a basin of silted clay up to 200 metres deep.
• They strongly reflect the seismic waves. But one problem with this kind of array is that the reflected waves
could end up doing more damage to buildings nearby
38. Shear Walls
39
Steel Plate Shear Wall (SPSW) consists of steel
infill plates bounded by boundary elements
Reinforced Concrete Shear Wall
39. Steel and FRP jacketing
40Steel Jacketing FRP Jacketing