More on the Umno tower-top collapse (Videos)

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Here’s more information about how the structure at the top of the Umno tower plunged and pierced vertically 30 metres deep into the road and the soft soil below.

And this is a technical explanation of what happened:

About the wind wing-walls of the Menara Umno, architects and planners TR Hamzah & Yeang Sdn Bhd had this to say:

The building has wind wing-walls to direct wind to special balconies zone that serve as pockets with “air-locks” (having adjustable doors and panels to control the percentage of openable windows) for natural ventilation. This building is probably the first high-rise office that uses wind as natural ventilation for creating comfort conditions inside the building. Other claims of ‘natural ventilation’ in high-rise towers, use natural ventilation simply as a source of fresh air-supply to the interior and not for internal comfort. For internal comfort as in this building, a higher level of air-change per hour is required. Here, we tried to introduce natural ventilation at point of entry (rather than create suction at the leeward side). To create pressure at the inlet, a system of ‘wing-walls’ to “catch” the wind from a range of likely directions. The wing-walls are attached to a balcony-device with full-height sliding-doors. The placements of the wing-walls and air-locks within the floor- plate are based on the architect’s assessment from the locality’s wind-data. The wing-wall cum air-lock device is of course experimental, and site verification with CFD analysis indicate that this device worked reasonably well. Experiences from the project, would enable the architect to further develop the device for other projects.

The soil conditions are described as very soft to soft clay, with resistance only at 30-55m below surface, while the water table was about 3 metres below ground level. Perhaps this is why the 50-metre long structure easily pierced 30 metres into the road.

A total of four test boreholes were conducted, each to a depth of about 64m for the sub-structure design. Generally, these borelogs indicate the site to be underlain by successive layers of very soft to soft clay, followed by medium stiff to very stiff silt and silty sand. Ground water table is generally between 2.7m to 3.5m below Ground level.

Column loadings vary from 3,200 Tonnes to 1,800 Tonnes for the widely -spaced columns. For the more closely spaced columns, the loading is about 740 Tonnes.

In the selection of foundation for the structure, shallow foundation like pad footing and raft was considered to be obviously not suitable in view of very poor soil (N – value of 3) to a depth of 9m below Ground level. Bored piling was not adopted in consideration of high water table with silty sand and low N-values at the upper layers. The requirements of long length of steel casings associated with boring in such soil to prevent collapse of bore holes would not merit value engineering decision.

For such soil condition and medium range column loadings, it was considered most appropriate to adopt driven reinforced concrete piles. Further reasons to justify the use of driven r.c. piles are that they are economical (especially, when compared to steel piles) and could be installed relatively quickly….

Essentially, these piles are skin friction piles which mobilise the good soil resistance properties at depth of 30 to 55m….

Now we hear that the tower owner failed to submit its safety report, due every 10 years, in 2011. We can build great structures with so-called ‘eco designs’ (check out the cardboard plastered on the windows of the tower), but do we have a maintenance and safety culture to match?

Is it true that the MPPP issued the contractor a special permit to start work two years before the building plans were submitted in 1997?

Are Umno, BN and federal government projects exempted from prior local council approval?

Obviously, there was a design or construction flaw. How was the certificate of fitness for the building approved, if at all? Is the remaining concrete slap jutting out from the tower-top securely fastened?

Did Umno really need a 21-storey, keris-shaped tower in Penang? Or was this another one of their “satu lagi” unnecessary extravagant projects?

The other issue is that our architects and planners perhaps never foresaw a day when climate patterns would become more extreme – thanks to our reckless degradation of the environment in pursuit of “economic growth” and the trappings of “progress”.

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Anak Penang

1 question, is the building occupied? Never seen any offices there.

Ong Eu Soon

No wonder no one can find the body. With the kind of impact, the body surely smashed to pieces. How can the foundation of the lightning arrest-or gave away? The building is designed to regulate wind flow, seem like it had irritated the wind instead. Man against nature. You only think that you are capable in reality you are hopeless and powerless when nature ran amok.

fairness & justice

Lets hope the insurance works in this incident. Insurance works better when the legal aspects have good governace working.

The building owner owes the public a duty of care and by law if found wanting, they shud be held liable, which in this aspect, there should be insurance protection.

When people die in lockups and no one knows, its a lot to mull about!

sotong bakar @ GK

I think there must be an NGO for counting all trees in Penang. After this wind storm, dap gomen has gone crazy chopping down trees. Even LGE in press conference confirmed this direction.

Good big/old trees are valuable and can be sold for huge $$$. We must prevent this kind of abuse in Penang after more and more hill botaking and endless concretion.

mark

The design of the structure(the collapsed pillar and the concrete piece with words on it) at the roof top look like a malay warrior headgear. The question is are these structures allowed to be built at the roof top? And if they are approved,are they built to specifications with utmost safety in mind? I am worried that concrete slab might give way at any time.

John Khoo

With this kind of CCTV video quality, no wonder they could not catch or identify any criminals. These kind of bad quality CCTV are around RM100 a piece, wonder how much they paid for it?

Erina

This is a clearer version on Youtube:

Mimi

My deepest condolence to the family of the affected victims.
Hopefully they will be compensated by insurance.

windler

Sounds better than the Worlds tallest Dubai Twisted Tower.

BTW, what was the approx weight of the damn thing?

saengch
Yang

With regards to submission of safety report every 10 years, I doubt many apartment and condo are doing that. In fact many of the management may not even know about this ruling. On the other hand it cost money and these apartment and low cost flats may not have that money as their apartment are running on a very limited budget. Take for example Noordin Street and Rifle Range flat. I doubt that there are any safety report after 40 years in existence. What about many private apartment ?. They are like living on a day to day basis until… Read more »

tunglang

Botak thinking (trees must go due to nightmares post-windstorms), aggrandizement of ‘Cosmopolitan’ projects, no differentiation between hills & flat lands use (the power of ‘anytime’ rezoning frenzies), developers’ quickie path to richie list of Forbes Magazine, tunnel vision (one track vision without the unexpected side-wind caution), cheap labor + heady designs (cut cost at the expense of safety without justifications of over-pricy selling of superfluous fathom lifestyle of rich & famous), housing legislation loopholes as big as the one pieced into Macalister Road, life is cheap, progress is all-god (worshipped sky high without rationale reservations), copycat development that are not… Read more »