Abstract
The paper deals with longitudinal shear flow of beams near the support area. Special interest is focused on the overhanging part, which exists in all kinds of beams irrespective of material and span. A parametric study on shear stress distribution at several horizontal height levels by using FEM is presented. Special emphasis is paid to the cantilever length. Finally, conclusions for practical applications are summarized.
Highlights
In practical design of bridge girders, knowledge of shear stress distribution at a certain horizontal height level of a beam is often needed
The longitudinal shear flow is investigated at the horizontal levels (“z” coordinate according to Fig. 1) with z/h ratio equal to 0.5, 0.6, 0.7, 0.8 and 0.9, respectively
The shear force, which has to be carried, is higher than the one computed according to the beam theory. The increase of this shear flow is dependant on the length of cantilever and SЈ/I ratio mentioned before (Fig. 7)
Summary
In practical design of bridge girders, knowledge of shear stress distribution at a certain horizontal height level of a beam is often needed. The design of shear connectors of the commonly used steel-concrete, wood-concrete or concrete-concrete composite girders can be mentioned. This knowledge is required when designing fillet welds of welded steel plate girders. Where V(x) is the internal shear force, SЈ(z) is the static moment of partial area with respect to the vertical level considered and I represents moment of inertia, respectively. In some cases this theory produces wrong prediction of stress distribution. This can be clearly seen above support areas because of two main reasons. The disc (wall) effect in this area is usually significant and this area should be considered as a two-dimensional problem at least
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