![]() ![]() The effect of wind on a light building cannot be overemphasized. Generally speaking it is a fact that portal frame buildings of this kind are light weight structures, and as such they tend to collapse “sideward” and “upwards” rather than do wnwards”. These destabilizing forces are resisted essentially by the weight of the building,and in this regard,the foundations contribute significantly to this weight. Roof loads are positive and up to down direction B/ If The joints at B,C and D are not rigid,they will open up and the frame will be unstableĬ/ 1) Vertical loading on the frame results in A and E tending to be pushed outwards.if the foundation cannot resist this horizontal push,outward movement will occur,and the frame will l oose structural strengthĢ) Wind subjects the portal frame to uplift forces(the roof tends to fly-off)like an overturning forces on the sides and ends of the building, Wind loads Wind loads can be positive as on AB or negative (suction)as on BC,CD and DE. The frame is designed for the following loads Analysis of portal frame building In accordance to EN (2005) 1 description A/ The portal frame is the main structural element of theīuilding.
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