Are buildings in Delhi-NCR more vulnerable to earthquakes? Here's all you need to know
New Delhi | Jagran News Desk: The Delhi-NCR witnessed 14 earthquakes in the last two months, all below magnitude 5 on the Richter scale. The earthquakes have created panic among the experts whether the national capital is prepared for a higher magnitude quake or not. According to scientists, not every tall building in Delhi-NCR is unsafe. However, they suggest that construction is a big factor, adding that most of the houses and high-rising in Delhi are not earthquake resistant.
The scientists believe that if an earthquake of 7 or more than 7 magnitude hits Delhi, then the national capital can suffer huge losses. According to a report by Vulnerability Council of India, the main reason for such devastation in the national capital would be the poor materials used in the construction of buildings.
The report said that 91.7 per cent buildings in Delhi are made from paved bricks while 3.7 per cent of its buildings are made from raw bricks. Experts believe that buildings made of raw or paved bricks are the worst-hit during earthquakes. IIT Jammu Professor Chandan Ghosh said that real estate agencies, contractors, builders, architects, planners, building owners, construction material suppliers, civil engineers, municipal officials, DDAs, MCDs, DUACs, Delhi Fire Service, Police, etc. should follow the National Building Code 2016.
He, however, noted that not all buildings in the national capital are earthquake vulnerable. According to Ghosh, the condition of some of the buildings in Dwarka has deteriorated because of the saline water. “Saline water, Badarpur sand, the silt of Ganga etc. should not be used in construction. But they are used more in Delhi-NCR,” he said.
According to Ghosh, old buildings can be made earthquake resistant by retrofitting. Under retrofitting, linter bands are inserted in the doors and windows of old buildings above where the roof starts. The four corners of the building are then joined with the help of linter bands.
Structural engineer approval required for high-rise buildings
It is necessary to get the approval of the structural engineer to build an earthquake-resistant high-rise building. After this approval, the Completion Certificate is obtained from the Fire Department. But surprisingly, only 30 per cent of the builders in Delhi-NCR are constructing by following this process.
Safety code for buildings
Experts say that during the construction of a multi-storey building, a concrete platform is prepared in the foundation for the base according to its length. The builders can only construct floors only according to the map. If a builder wants to pass the revised map, then he or she will have to take the NOC from the investors making the booking. Authorities can cancel allocation if a builder arbitrarily creates additional floors.
Things that should be kept in mind while making a house or a building
Before constructing a house at a plot, it is important to check the soil of that place. Architecture Santosh of Mumbai PWD said that people can get information about the capacity of the designated place, the complete soil condition etc. through this inspection. Not only this, the map of the house and the number of floors can also be decided through this inspection, but he also said.
Things you should keep in mind while buying a flat
While purchasing a flat, experts say that people should get a certificate from the builder. This certificate should be under the National Building Code only. Not only this, but the material used in the house should also be tested for concrete, cement, brick, barrels etc. All the plaster, column base etc. used in the house should be thoroughly investigated.
It is necessary to find out the thickness and number of columns in the house, the position of soil used in construction, etc. Also, the structure, shape, pattern, windows and other things of the house should be inspected by a structural engineer. If you are making the floor, then the additional expense will be 10 per cent.
Things that you should keep in focus while making a house or a building
- Encourage anti-structural design
- Indian instructions and standards of earthquake techniques should be followed
- Seismic assessment and retrofitting of lifeline buildings
- Disaster safe construction practice should be promoted
- Use of techno-legal and techno financial framework
Posted By: Aalok Sensharma