Generally, building collapsed due to following reasons: Manmade reasons: Soil with less bearing capacity. Proper foundation not provided. Corroded reinforcement. Errors in the structural design and/or implementation of the design on site. Inferior material quality used. Less amount of reinforcement provided. Overloading (going above approved number of floors). The use of building after the expiry of life. Lack of proper maintenance. Illegal cutting or chiseling of structural members Natural reasons: Earthquake Landslides or settlement of Sub-base soil due to over drainage. Tsunami Typhoon and winds with high speed.

Lagos Building Collapse: What are the reasons of Building Collapse?

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Generally, building collapsed due to following reasons:

Manmade reasons:

Soil with less bearing capacity.
Proper foundation not provided.
Corroded reinforcement.
Errors in the structural design and/or implementation of the design on site.
Inferior material quality used.
Less amount of reinforcement provided.
Overloading (going above approved number of floors).
The use of building after the expiry of life.
Lack of proper maintenance.
Illegal cutting or chiseling of structural members

Natural reasons:

Earthquake
Landslides or settlement of Sub-base soil due to over drainage.
Tsunami
Typhoon and winds with high speed.

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Building also collapse for other reasons other than manmade and natural reasons, these include but not limited to the following:

Extraordinary loadA
Unexpected failure mode
Demolition through explosives

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Overloading

Having too many people or load on a balcony or deck is a common reason for the collapse of such structures or when the occupancy of areas are changed without technical evaluation

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Lack of maintenance

A lack of maintenance of noticeable structural errors/defect on a building can lead to catastrophic failure of the building

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Fire

Fire reduces steel yield strengths, causes concrete to undergo chemical changes that weaken it, causes masonry to spall/crack, and will consume wood materials. This can result in partial or full collapse of a building engulfed by fire.

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Under-designed Structure

Don’t confuse this with bad engineering!

By under-designed, we mean that your design followed the code correctly and performed good calculations, but it still was inadequate for the imposed loads and as a result the structure is unfit for purpose.

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Impact damage

Such as someone driving a car into a house or a terrorist flying an airplane into a tower which can result in partial or full collapse.