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Abstract The pt~esent t~esearch is concerned with the behaviour of box beams with openings in either the webs or in the lower flange • The effect of varying the opening location in the longitudinal or transversal directions on the box behaviour is studied Also the effect of symmetrical and d r at or-t Lon a I loading is studied. The research objective is to find the best location of openings in webs or lower flange that has the least effect on deflections and stresses. It aims al~o to overcome the pr-oblem of concentrated stt~esses and excessive deformations arising from certain openings location Openings flanges located near the junction lines between webs and in unstiffened box beams have shown a dangerous effect on deformations and stresses • Special treatment is needed for such openings • |