MSBs vulnerable on clay soil, says expert
C Shivakumar/ ENS
Chennai:
About 1,500 to 2,000 multi-storeyed buildings have been identified by
the monitoring committee to have flouted development control
regulations.
Monitoring Committee member M G Deivasahayam says the now the issue is
that nobody knows how safe are these illegal buildings as violations
pertain to failure to abide by fire safety norms, setbacks, floor
space index and building height.
With the collapse of the 11-storey building in Moulivakkam that killed
61 people, we even don’t know about structural stability of buildings
in the city due to lack of expertise pertaining to evaluating the
structural design as well as soil tests in both Chennai Metropolitan
Development Authority and local bodies., he said.
Now, government should either plan a technical committee for issuing
structural stability certificates to the institution or else put the
onus on the institutions like IIT and Structural Engineering Research
Centre or even Anna University to certify the structure is safe before
allowing them to go ahead and plan their building, Deivasahayam said.
A leading structural consultant T M Ramakrishnan told Express that the
soils of different part of Chennai need to be classified as clay and
unconsolidated sediments are likely to amplify earthquake energy
effects.
He also questioned whether piling has been done properly in the case
of Porur building collapse. “The site is 500 metres away from the lake
bed and piling foundation should have been done till you hit the
rock,” he said.
Ramakrishnan also said that most of the builders are using pre-cast
multi-storeyed building concrete so that building gets completed fast.
“In Chennai, it should not be done as the soil conditions is not
suitable besides the city is Hazard III zone (greater vulnerability to
quakes). This is sort of technology is okay in singapore or for that
matter even in hyderabad which is a inert zone,” he said.
“There is a need for comprehensive soil analysis besides deep
foundation has to be implemented based on height and load of the
structure,” Ramakrishnan said.
K P Subramaniam, a former professor of Urban engineering in Anna
University , states that there is also a need for the government to
look at single channel of planning permission rather than focusing on
dual channel of permission. He says once the builder gets approval for
the plan, then again he has to get the permission from local body for
building permit. “All CMDA has to do is hand over the approval part to
local body and look after plans only,” he says.
C Shivakumar/ ENS
Chennai:
About 1,500 to 2,000 multi-storeyed buildings have been identified by
the monitoring committee to have flouted development control
regulations.
Monitoring Committee member M G Deivasahayam says the now the issue is
that nobody knows how safe are these illegal buildings as violations
pertain to failure to abide by fire safety norms, setbacks, floor
space index and building height.
With the collapse of the 11-storey building in Moulivakkam that killed
61 people, we even don’t know about structural stability of buildings
in the city due to lack of expertise pertaining to evaluating the
structural design as well as soil tests in both Chennai Metropolitan
Development Authority and local bodies., he said.
Now, government should either plan a technical committee for issuing
structural stability certificates to the institution or else put the
onus on the institutions like IIT and Structural Engineering Research
Centre or even Anna University to certify the structure is safe before
allowing them to go ahead and plan their building, Deivasahayam said.
A leading structural consultant T M Ramakrishnan told Express that the
soils of different part of Chennai need to be classified as clay and
unconsolidated sediments are likely to amplify earthquake energy
effects.
He also questioned whether piling has been done properly in the case
of Porur building collapse. “The site is 500 metres away from the lake
bed and piling foundation should have been done till you hit the
rock,” he said.
Ramakrishnan also said that most of the builders are using pre-cast
multi-storeyed building concrete so that building gets completed fast.
“In Chennai, it should not be done as the soil conditions is not
suitable besides the city is Hazard III zone (greater vulnerability to
quakes). This is sort of technology is okay in singapore or for that
matter even in hyderabad which is a inert zone,” he said.
“There is a need for comprehensive soil analysis besides deep
foundation has to be implemented based on height and load of the
structure,” Ramakrishnan said.
K P Subramaniam, a former professor of Urban engineering in Anna
University , states that there is also a need for the government to
look at single channel of planning permission rather than focusing on
dual channel of permission. He says once the builder gets approval for
the plan, then again he has to get the permission from local body for
building permit. “All CMDA has to do is hand over the approval part to
local body and look after plans only,” he says.
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