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Transcript
Japanese earthquake resistance
technology
Arch 561 Chenxing Sheng
• 1 structural seismic Technology
• 2 Structural material selection
• A base isolation system
The Japanese, the most important issue is how to build a solid house. During earthquake,
the houses can remain and do not fall down. This technique is called "seismic technology."
Seismic is a technology that use to solid walls and foundations and connect them together,
With foundations. The advantage of this technique is that building is strong, but the
disadvantages are also obvious. Though able to keep the building intact, but
the dumping of house furniture that caused by earthquake, not only make the goods
damage, but also can cause people's fear about the disaster. Sometimes it may influenced
A whole life.
•
After the 1980s, especially the 1995
Osaka God earthquake, the Japanese
researchers developed a "seismic
isolation building. The so-called
"seismic isolation technology" that is,
between the building and its
foundation, people add anther part
that made ​of a material with a soft
layer of shock-free. So with this
technology, people can keep house
and also can keep the house
furniture or other items. This avoid
the residents mentally and physically
harm. This technology is very cheap.
It is said to build a seismic isolation of
individual homes, just put the cost of
a normal car.
•
•
•
•
Isolation device
1 isolator: a high vertical and horizontal load carrying capacity. Such as laminated
rubber bearings, sliding bearings.
2 Dampers: improve the damping isolator. Such as plastic damper, dry friction
damper, viscoelastic dampers.
3 Reset Device: Prevent microseismic structure under wind loads affect the use,
as well as the building after the earthquake timely reset. Rebound sliding bearings,
spiral spring bearing
EXAMPLE
• Built in 1994, Kobe, Japan, West Post Office
Building, which have six floor and two towers. It
is 38.35m high and ​46,000 square meters area.
Isolation layer is disposed between the base and
the floor, was Japan's largest seismic isolation
building. When the building is completed, it faced
the 1995 Great Hanshin Earthquake.
• the observation records indicate that the upper
structure only has 1/3 to 1/4 maximum
acceleration and the upper structure is not
damaged. Isolation effect has been confirmed.
Yokohama, Japan pylons Building
"Local buoyancy" Seismic System
• Japan has developed a project called "partial buoyancy"
seismic system which, by means of conventional seismic
design based on the buoyancy of water to support the
entire building. There is a storage tank between the upper
structure and foundation. The buoyancy of water can
support about half the weight of the building. It can reduce
the load bearing foundation, but also can make rubber
isolator small. When Earthquake occurs, the buoyancy of
water can reduce the building’s acceleration. In addition,
water storage tank water storage can be used in case of fire
extinguishing. After the earthquake it can be used as
temporary living water. The system cost is not high. For 8
floors Hospital, for example, the price is just higher about
2% than ordinary seismic systems.
EXAMPLE
The Keio Hotel
Energy dissipation system
• Energy dissipation system is in some parts of
the structure, taking certain measures in order
to consume the energy of the earthquake
passed to structure.
• Principle: the viewpoint of energy (the energy
of the earthquake can reduce through the
energy dissipation) damage and kinetic point
of view (increasing structural damping, reduce
the structural dynamic response)
• Restrained Brace (friction brake)
• Viscoelastic dampers
• Quality Pumps
• Active structural control
system
• Refers to the use of
automatic control theory,
the smaller additional
mass produce better
damping effect.
•
Principle: source →
sensor → Processors →
Brakes
•
Projects: Yokohama
landmark tower
"bandages" pillars
• Japan invented a cheap shock reinforcement
technology. Using resin material "bandage" to
wrap building pillar. This technique is
developed by the Institute of Quality
Assurance constructed technique and called
"SRF process." Earthquake "bandage" is made
of resin fiber woven manufacturing and its
shape like a seat belt. The seismic belt coated
with adhesive and wrapped secured to the
building pillars.
When the earthquake
occurred, even if there is
internal damage of pillar it
will not collapse, which
could ensure personal
living space.
Choice of building materials
• Such as in Europe, China is often build brick building. Now
in Japan almost could not find traces of buildings and
Japanese colorful "tiles" is a made of plastic. 1923 Great
Kanto Earthquake proof brick houses without seismic. Since
then, brick building in Japan, is almost no longer used and
replaced by reinforced concrete houses. Because of the
excellent seismic performance of wooden structures , Japan
also has a large number of wooden houses. In order to
improve the traditional wooden architecture of the seismic
capacity, it is designed like a cabinet - when the
earthquake happened, the whole house tumbling, and will
not be damaged. Steel is an excellent seismic performance
of building structures, because steel is a plastic material. As
shown, the wooden structure and steel housing.
•
THANK YOU