AN Experimental Study on Strengthening of R.C Flat Slab Edge Column Connections Subjected to Punching Shear Due to Eccentric Loads Using FRP

Document Type : Original Article

Authors

1 Department of Civil Engineering, Benha Faculty of Engineering

2 Civil Engineering, Benha Faculty of Engineering, Benha University

Abstract

 During the last few years, the need to flat slab systems has rapidly increased.
The slab column connections behavior plays decisive role because of the sudden
expected brittle failure as the slab may be punched by column, so improving the
behavior of these connections is essential. Flat slab column connections can benefit
from being strengthened by fiber reinforced polymers (FRP) as a structural application
in punching shear [1]. The effect of using carbon fiber (CFRP) and glass fiber (GFRP)
was investigated experimentally, also steel reinforcement bars were utilized as
strengthening element for comparison. Results of tested fifteen half-scale flat slab-edge
column connections reinforced concrete specimens under eccentric loads were
obtained. The investigated parameters were the eccentricity value, the type of
strengthening material and the number of rows of strengthening elements. Five groups
were created from the fifteen tested specimens, every one contained three specimens.
The first group consisted of three non-strengthening specimens, with variable
eccentricity values (0, e & 2e), these specimens were considered as control ones. Each
of the other four groups consisted of three specimens, which were strengthened by
CFRP, GFRP and steel bars. All the specimens of the second and fourth groups were
strengthened by one row of strengthening elements. All the specimens of the third and  fifth groups were strengthened by two rows of strengthening elements. The second and
third groups were loaded with the eccentricity value (e) while the fourth and fifth
groups were loaded with the eccentricity value (2e). According to the test results,
punching shear resistance increased up to 82 %. Also, the ductility factor results
revealed improvement of up to 50%. Ultimate loads were predicted according to ACI
440, and the calculated values shown good agreement with the experimental ones.

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MSA Engineering Journal
Volume 2, Issue 2 - Serial Number 6
Special issue for Artificial Intelligence & Sustainable Engineering Conference: A Path to The Future
March 2023
Pages 218-250

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