How many home communities damaged by the earthquake. Judging from Tasikmalaya earthquake on September 2, 2009, the National Disaster Management Agency reported that 67,760 houses and damaged 150,839 homes only minor damage in some areas of West Java.
Wibowo Hengki Ashadi, lecturer at the Department of Civil Engineering Faculty of Engineering, University of Indonesia, Thursday (10 / 9), say, build earthquake-resistant homes are not complicated, just requires the establishment of appropriate detail in certain parts.
"Building earthquake-resistant homes are not expensive. Material selection can be started from the use of brick ruins of the former to the use of lightweight materials, like cork boards for lining the inside wall surface coated with a thin concrete, "said Hengki, Thursday (10 / 9) at his office in Jakarta.
Hengki said, most victims were killed by the earthquake-stricken victims of the building. To reduce these risks in the future, people living in earthquake-prone areas should consider the methods of earthquake-resistant housing construction.
Reflecting the earthquake Tasikmalaya, according to latest reports the National Disaster Management Agency, there were 80 people were killed and 47 people listed as missing. Then as many as 1142 people were injured. This is very tragic. If only their buildings earthquake-resistant homes.
Of the total population of thousands of homes damaged by the earthquake, there are additional data unit of 1193 heavily damaged school buildings and 1664 units lightly damaged schools. This shows, among the world of education is still ignorant of earthquake resistant buildings.
Sengkang correct
Hengki said, made earthquake-resistant houses with a common form of the population as now made it easier and cheaper. The key to making detailed placement and diameter of a circle (ring on the block) to be true.
"I had surveyed the building stores that sell metal frame for concrete blocks. The average diameter of a circle placement of all positions, "said Hengki.
The position of the right cross bar aims to eventually house built to withstand earthquakes. Looking right Sengkang density cross bar positions at opposite ends of each block of concrete. Sengkang at both ends of the block must be tight.
Density distance from each other cross bar could be about 5 centimeters. However, the correct standard, the stone for the concrete mix can be used to escape. If the size of the stone gravel about 2 inches, density inevitably dash no more than 2 centimeters.
For the height of the circuit, the position of the conference cross bar twice the width specified block to be formed. If the beam width of 20 inches, diameter of a circle of close circuit at both ends of the block should be 40 inches in length.
"The position of the cross bar docked at both ends of the retaining block earthquake motion. Form detailed cross bar at the end of this concrete block of the most important, but still much neglected, "said Hengki.
Based on the survey to the stores that sell building cross bar, according to Hengki, form cross bar sold in stores that building an average one. "The tip of the iron cross bar which was not deflected position to the middle of the diagonal cross bar," said Hengki.
Iron tip diameter of a circle that was deflected into the middle of the diagonal function gives more strength to resist earthquake forces.
Related to the strengthening of other bone structures that are often overlooked communities, continued Hengki, ie there is no anchoring in connection with the vertical concrete block horizontally.
Anchoring or bending the metal tip of the horizontal beam attached to the bottom of the vertical steel beams that have a long formula of 20 times the diameter of the iron used. If iron is used 10 millimeter diameter, penjangkarannya enough to 200 millimeters.
Flexible concrete block
Another method to make earthquake-resistant homes are concrete block with a flexible formation. Flexible concrete blocks are not merged with drywall, but only connected with a steel plate.
"When an earthquake happens, flexible concrete block structure was freed to move. However, retained the lining does not move to avoid the cracks, "said Hengki.
In principle, building or house is earthquake resistant using a lightweight material, but strong. Logically, when forced to collapse by the earthquake, the building structure of light material that will not get off.
"Herein lies the key to re-visit the traditional ways we are in a building or a house with wood and bamboo. Then, the roof form of fibers, and so on, "said Hengki.
Selection of materials such as wood and bamboo filled lightweight and strong elements, such as making or gedek walls with a bamboo stick jersey was clearly going to form a soft lining and a friendly against earthquake.
To travel back to the traditional method, Hengki says, the most important step is to make materials stronger and more durable, such as bamboo coated with a polymer.
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