Abstract

 
 
 
 The aim of this research is to study the effect of using corrugated steel plate strengthening on the structural behaviour of reinforced concrete box girder by using corrugated steel plates with vertical and horizontal corrugation and studying the effect of the shape of cells by using rectangular and circular shape with the same web width and strengthening the circular cell with smooth plate. Five simply supported reinforced concrete box girders are casted by using Self-compacting concrete and experimentally tested under four-point load. The box girder specimens are divided into two groups according to the steel strengthening and the shape of cells. The experimental results showed that in the first group, the using of the vertical and horizontal corrugated steel plates strengthening increased the ultimate load by (7.14% and 11.03%) respectively compared with the control box girder, and decreased the crack width, the results also showed that in the second group, the using of circular cell and circular strengthened cell increased the ultimate load by (17.85% and 29.22%) respectively compared with the control box girder with rectangular cell and decreased the crack width. All the box girders in the first and second group failed with diagonal shear.
 
 
 
Highlights
The box girder is a very commonly used structural member, it consists of two or more webs that either vertical or inclined, connected with top and bottom flanges to produce the single-cell or multi-cell box girder with rectangular or trapezoidal cross-section [1]
The results show that there is increment in the ultimate load of the specimens (BCC and BCCSPS) by (17.85% and 29.22%) respectively compared with the specimen (BRVS), This increment is due to the use of circular cell because the stress in the circular shape cell is distributed and acts as uniform while the stress distribution in the rectangular shape cell is more concentrated in the corners, the volume of concrete increased in the specimens with circular cell which lead to increase the stiffness due to the increase in the moment of inertia, it is due to the using of steel plate strengthening in the specimen (BCCSPS)
The ultimate load of the box girder strengthened by vertical and horizontal corrugated steel plate increased by (7.14% and 11.03%) respectively compared with the control box girder, the ultimate load of box girder with rectangular cell with horizontal corrugated steel plate is more than in box girder with rectangular cell with vertical corrugated steel plate by (3.63%), which indicates that the horizontal corrugated steel plates is more efficient
Summary
The box girder is a very commonly used structural member, it consists of two or more webs that either vertical or inclined, connected with top and bottom flanges to produce the single-cell or multi-cell box girder with rectangular or trapezoidal cross-section [1]. The un necessary materials are removed out of the section in order to reduce the dead load, which result the shape of the box girder or the cellular structure. The formed closed cell has a very greater torsional stiffness and strength compared with the open section which is the usual reason for choosing the box girder [2]. The web of box girder can be relatively thin in order to reduce the deadweight [4]. The span range for the box girder bridge is more compared with the T-beam girder bridge, less requirement for support points which results to make the box girder more economical [2]. The box girder bridges are chosen for the span range from (20m to 40m) for reinforced concrete bridges and (40m to 100m) for the prestressed concrete bridges [5]
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