STABILITY of BUILT FORMS

STABILITY of BUILT FORMS

Post 456

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Stability of a building is checked in terms the Physical condition, Structural integrity, and the stack-holders’ perceptions. The last factor is subjective, but it presents cumulative considerations of several participants. The Physical conditions are checked through the weathered conditions and user-related wear-tear to the building. Structural integrity ensures its capacity to stand-up in equilibrium, by defying, overcoming or consistently being with the gravity, safety and security as a place of habitation and in few instances as a long-lasting entity (of archeological relevance).

Ruined building

Leaning Tower of Pisa

Stability of buildings and other structures is an important factor during its lifetime and during construction, repairs-maintenance, alterations, renovations, extensions and demolitions. The stability is mainly related to the gravity disturbing the form. Other factors affecting the stability are the structure’s patterns of load transfer to soil, which could be as whole or local inadequacies. The integrity of the structure against lateral disturbing forces such as earthquake, winds and pressures of heavy blasts. The bearing of loads and their transfer modes, ultimately affect the stability of a building. Vibrations destabilize a structure. Stability of a structure is affected by sudden loading, point loading, and continuous vibrations. The disintegrations caused by these conditions enhance users related, wear-tear and effects of weathering.

Grand Coulee Dam Stability of gravity bearing form

Tacoma-narrows-bridge-collapse

Tacoma narrows bridge collapse 1940s

Stability of a structure is perceived as its capacity to serve its functions under nominal (designed) load conditions. A stable structure has deformations that are recoverable, and within designed limits. Stable structure could be static or dynamic (like a car) but in equilibrium. A space ship in a no-gravity zone is affected when small perturbations that produce movement in the direction of force. It can continue to move, without missing its state of equilibrium.

ALASKA pipeline on slider supports to prevent buckling over a land fault

Change in geometry of a structure or structural components under compression causes buckling. Buckling is non-recoverable condition of structures’ geometry. Such changes destabilize compressive elements such as columns, walls, foundation base and pedestals and parts of beams.

Embankments Kumbhal Gadh fort Rajasthan India > Perception of safety and stability.

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