Dynamic Analysis
INTRODUCTION
Dynamic Analysis is used in the design of structures and buildings subject to vibration.
Vibration can be induced in a structure by the following:
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Vibrating Machinery
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Earthquakes
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Wind Load: Vortex Shedding
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Explosions
DESIGN
The dynamic design of structures can be carried out manually. However, finite element analysis are applied to structures subject to dynamic loadings to determine the amplitude of vibration, the distance the structure will vibrate, and also the frequency of the vibration. The natural frequency of the structure must never be approached.
FAILURE MODE
Fatigue: The structure is continuously flexed by the induction of vibrational forces into it, the structure may fail through fatigue.
Dynamic Acceleration: The Structure is accelerated by either a shock wave from an explosion, or an earthquake. This can either cause local failure or major structural damage.
Natural Frequency: The structure reaches its own natural frequency, and shakes itself to pieces. The most famous failure of this mode is the Tacoma Narrow Bridge in the USA.
Foundation Failure: Certain granular soils when vibrated at a particular frequency become fluid and this can cause a massive subsidence of foundations.
HOW WE WORK
The dynamic analysis, design and inspection of the following is carried out:
Buildings
Ground bearing or elevated table top structures to support compressors and turbines.
Design of buildings to resist blast: Control buildings in petrochemical and hazardous industrial plants.
The design of reinforced concrete foundations either ground bearing or elevated for all structures.
Foundations: Specialist design to either isolate foundations from vibrations or to resist vibrations.
Towers, masts and chimneys.