What are the different factors to be kept in mind while designing Pre-Engineered Buildings?by Sunil Srivastava Managing Director
What is a pre-engineered building?
In structural engineering, a pre-engineered building is developed by a PEB supplier or PEB manufacturer. It is fabricated utilizing the best available raw material and makes use of manufacturing techniques that can effectively satisfy an extensive range of structural as well as aesthetic design needs.
Safety is always of paramount importance while designing a building. So, what are the different ‘loads’ that need to be taken care of while constructing a pre-engineered building?
Dead and Collateral Loads
Dead load is referred to as the weight of all permanent construction materials namely framing, roofing and other structural elements. Since it is well designed and known in advance, dead load is allocated a comparatively low factor of safety in the ultimate (load factor) design. Collateral or superimposed dead load is a particular kind of dead load that incorporates the weight of any materials other than the permanent construction. It may take into consideration the weight of mechanical ducts, sprinklers, future ceilings, electrical work and re-roofing.
Live load is viewed as the weight of building occupants, storage products, furniture, portable equipment etc. Since live load is comparatively short-term and not necessarily predictable or quantifiable, it factors in significant amount of safety, in the end design methods. Other sources of live load come up during construction, repair or maintenance of the building and these are much more complex to quantify or predict. To tackle with this uncertainty, building codes have enabled conservative values for live loads. The framing need to be designed to withstand the loads which might happen only once or twice in the life span of the structure.
In order to design wind-resisting structures, the engineers find it necessary to know how to quantify the wind loading and distribute it among different building elements. Since a long time, engineers regarded wind to be a horizontal force and computed it by multiplying the design wind pressure with the estimated area of the building. As more elaborate research on wind was carried out, a more complex picture of the wind force distribution on gable buildings eventually came to be acknowledged. The wind is generally used perpendicular to all surfaces – both pressure and suction on the roof and walls are regarded, as internal as well as external wind pressures.
Factors impacting the magnitude of earthquake forces on the building incorporate the kind of soil, since specific soils have the tendency to increase seismic waves. The degree of the building’s sturdiness is also vital. The design seismic force is inversely connected to the primary period of vibration. The force is also impacted by the kind of building’s lateral load-resisting system. Most building codes affirm that the structures designed suiting the seismic code provisions ought to withstand minor earthquakes without sustaining damage, moderate earthquakes without structural damage and the big ones without collapse. The structure should have the capability to last past its elastic region so as to dissipate the earthquake-generated energy.
Cranes are often requires for material handling in metal buildings. A building crane is a complex structural system that encompasses the actual crane with trolley and hoist, crane rails with their fastenings, structural supports, crane runway beams, stops and bumpers. A motorized crane would comprise of electrical as well as mechanical components. Numerous types of cranes are appropriate for industrial metal building systems. Sometimes, stacker and gantry cranes may be needed for unique warehousing and manufacturing requirements.
So any PEB structure manufacturer has to factor in all the loads when it comes to constructing pre-engineered steel buildings.
Created on Jan 15th 2018 02:14. Viewed 241 times.
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