earthquake resistant
Japan is a country prone to earthquakes, and interest in seismic reinforcement has been increasing in recent years.
There is a 70% chance that the Nankai Earthquake, which occurs every 100 to 150 years, will occur within the next 30 years, so we believe that it is essential to prepare for earthquakes. Of the 6,434 people who died in the Great Hanshin-Awaji Earthquake, a large number of them were crushed to death by collapsed wooden houses.In fact, over 80% of the casualties were due to collapsed wooden houses. On the other hand, we know that if wooden houses are made more earthquake resistant in preparation for predicted mega-earthquakes, the number of deaths from disasters can be greatly reduced.
Renovation often involves changing the floor plan, so walls may be removed or moved. Especially for detached houses, it is important to consider earthquake resistance when planning.
Points that determine earthquake resistance.
POINT.1
ground
The shaking of a building is greatly affected by the condition of the ground. In soft ground, the amount of wall needs to be 1.5 times the standard.
POINT.2
Weight
Since seismic force is proportional to the weight of a building, it is desirable to make the building lighter in order to improve its seismic performance.
POINT.3
Wall
In a wooden house, the walls mainly bear the earthquake force, so the required amount of walls is determined.
POINT.4
floor
If the horizontal structure of the floor is not sufficiently rigid, the strength of the walls will be affected.
POINT.5
Joint
Buildings constructed using the frame construction method are required to maintain a certain level of strength at joints such as foundations, columns, and beams.
What kind of homes require reinforcement work?
1. Wooden houses that do not meet the new earthquake resistance standards
1981strengthened by the revision of the Building Standards Act.Wooden houses that do not meet the “new earthquake resistance standards”requires caution. If the application for building certification was made before 1981, it means that the building does not meet the new earthquake resistance standards, so be sure to check.
2. Houses that have been diagnosed as “needing earthquake-proofing” in an earthquake-resistance diagnosis
To check the earthquake resistance of your home, you can request an earthquake resistance diagnosis from an architect or construction company.Diagnoses whether the building has sufficient earthquake resistance by checking the ground condition, building shape, construction date, wall condition, etc.is. As a result of an earthquake resistance diagnosis, if a house is found to need earthquake resistance, it is necessary to carry out seismic reinforcement work as soon as possible.
3. extended house
In the pastHouse with extensionThere is also the possibility that the connection between the original part and the added part is insufficient, and there is a risk of major damage caused by an earthquake.
4. Houses that are deteriorating
supports housing There are cracks and slopes in the found ation. Such, Housing that is deteriorating cannot be said to have sufficient earthquake resistance. Presence of termite damage It is also necessary to check the deterioration condition.
5. House with a large atrium
Houses with large atriums are at risk of being distorted by an earthquake. Because there are fewer pillars and walls, earthquake resistance tends to be weaker. A large atrium measuring over 4 meters on each side If so, we recommend that you undergo an earthquake resistance diagnosis.
Also A building where the second floor protrudes from the first floor or, A building where rooms on the second floor are supported only by pillars on the first floor. You also need to be careful.
wall reinforcement
Daiken :壁大将
Foundation reinforcement
ＦＲＰgrid
Reinforcement hardware
Hole down hardware
If you are concerned about the earthquake resistance of your home, please feel free to contact us.