الفهرس 
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Abstract
Due to the accordion effect, corrugated steel webs are merely able to resist shear force. The shear force in the web can cause three different buckling modes: local, global and interactive shear buckling. Although several researchers have been investigating them, the shear buckling behaviour of the corrugated webs has not yet been clearly explained specially for zigzag shape. This, however, leads to conservative buckling stress predictions Therefore, an elastic bifurcation buckling analysis is carried out in this thesis for zigzag corrugated webs by using ABAQUS computer package. The corrugated webs considered herein have practical dimensions similar to those of the available bridges with corrugated webs. The critical shear buckling stresses of the corrugated webs obtained from the finite element analysis are compared with the available interactive shear buckling stresses formula. The results show that the available formula conservatively predicts the shear buckling stresses of zigzag corrugated webs with very high margin of safety As a result of this research, a modification is made to the available interactive shear buckling stresses formula ( cr,I ) to provide more accurate results Moreover, the methodology of this research also depends mainly on experimental events and theoretical analyses on full scale girders with zigzag corrugated webs.