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(Continued from last week …)
In steel building construction, temperature loads are important to note as steel will expand and contract as the ambient temperature fluctuates. Heat and cold loads, arguably, are determined by the building use, climate, and level of insulation. It may not be so important to calculate the correct thermal loads for buildings that are smaller, buildings in temperate climates, or climate controlled structures. Where there are changes in seasonal climates, and also for unheated single story steel buildings with expansive clear-span capability, however, it may be imperative. Thermal shrinking due to cold weather, as an example, may damage welds and bolts of pre-engineered steel structures. If there can be an increase or decrease of 50 degrees Fahrenheit from the most conceivable temperature at the time of the building’s erection, then cold and heat loading estimates should be considered in steel building designs.
(Continued from last week …)
Ductility, or the ability of the structure to have vital reinforcing components deform but not break, is an approach that 21st Century structure design implements to increase seismic resistance. Ductility is vital where local building regulations cover seismic activity. The correct applications of seismic codes should help any structure to endure strong earthquakes without structure collapse; endure moderate earthquakes without significant structural damage; and endure small earthquakes with no damage at all.
(to be continued next week …)
(Continued from previous post …)
The intensity to which seismic action can strike a building is brought about for many reasons. The type of soil that the building sits upon is relevant. There is an increase of seismic shock effects on a steel structure built on particular soils. Structure rigidity is another aspect. Engineered counteraction to any seismic action is critical for any structure’s endurance involving the lateral load resisting features that have been fabricated into the steel building.
(to be continued next week …)
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(Continued from previous post …)
Earthquake momentum is carried by the inertia of a building that is not susceptible to any surface agitation, says another theory. The lower portion of the building moves with the ground as it begins to move away from the structure, but inertia holds the rest of the building in one spot for some time. The more weight to the structure, the more substantial the seismic force that acts upon it.
(to be continued next week …)
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(Continued from previous post …)
Earthquakes can cause considerable damage, if not total destruction, to man-made dwellings. As more is learned about seismic action, structural codes are continuously adjusted to estimate deflection and resistance in a structure to this power. There are a couple of beliefs concerning earthquakes and their effect on structures. When two segments of the earth’s layer push together, an earthquake results, says one theory. Earth movement develops on the earth’s surface and initiates seismic shock waves. From the center of the earthquake, these types of seismic waves will decrease in intensity as they move outwards.