Abstract
Flat reinforced concrete (RC) slabs or plates are still widely used in buildings and are most popular in single or multiple story floor construction systems. This is due to the ease and speed of implementation as well as the continuous smoothness that is provided in relation to the locations of members. Flat slab systems have an inadequate shear strength in both directions. Thus, they are subjected to a shear failure at their intersections with columns, which results in the collapse of a larger part of the structure. Shear failure occurs due to many reasons including changing the functions of the facility, the technical errors in the design and implementation procedures, an increase in the load, deterioration of materials, and poor quality. The carbon fiber reinforced polymer (CFRP) sheets/strips and glass fiber reinforced concrete polymer (GFRP) are used as a composite section formulated when there is a structural deficiency. Strengthening by using CFRP and GFRP provide an improvement in the punching shear resistance in both directions as well as flexural strength, ductility, and hardness. They are more suitable for a practical use as a substitute for other costly and difficult approaches such as increase the cross-sectional area of columns and so on. This paper reviews the up to date studies of enhancing the shear resistance of flat slabs by CFRP/GFRP and discusses the used materials for strengthening flat slabs and the used methods, which are used to implement these materials. Also, a summary for the cited studies are stated and the possible future works are suggested.
Highlights
The process of strengthening for buildings has been rapidly growing in recent decades in the field of civil engineering
The main findings in the reviewed papers in terms of the punching shear resistance of flat slabs can be drawn as follows: 1) The two most common techniques used to strengthen the region in closing to the column with carbon fiber reinforced polymer (CFRP) strips/sheets include attaching of CFRP to the concrete surface around column at the tension side of the slab
Whereas the other is performed by fixing the CFRP strips/sheets vertically and by various methods to ensure the increase of the shear resistance
Summary
The process of strengthening for buildings has been rapidly growing in recent decades in the field of civil engineering. The strengthening technique was divided into two groups including orthogonally and skewed attached CFRP strips They stated that using lightweight CFRP and adhering them with their glue or fixing with anchors bolts to the concrete surface can increase the resistance of flat slabs against punching shear, especially when the fastening is skewed from the column axis directions. The studied parameters include volumetric steel fiber ratio, removing limestone powder from mixing, slab thickness and steel reinforcement ratio He stated that the effect of slab thickness and steel fibers are more significant in increasing the ultimate load capacity, stiffness, ductility, reduced crack width of the strengthened slabs. L: Critical section location.; the rest of factors is defined in the cited codes and standards
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