http://www.iaeme.com/IJCIET/index.asp 382 editor@iaeme.com International Journal of Civil Engineering and Technology (IJCIET) Volume 10, Issue 02, February 2019, pp. 382-392, Article ID: IJCIET_10_02_041 Available online at http://www.iaeme.com/ijciet/issues.asp?JType=IJCIET&VType=10&IType=02 ISSN Print: 0976-6308 and ISSN Online: 0976-6316 © IAEME Publication Scopus Indexed SUGGESTING DEFLECTION EXPRESSIONS FOR RC 2-WAY SLABS Khattab Saleem Abdul-Razzaq, Abbas H. Mohammed and Taha K. Mohammedali Department of Civil Engineering, University of Diyala, 32001, Diyala, Iraq ABSTRACT The purpose of the experimental work presented in this study is to study the effect of concrete compressive strength and steel reinforcement ratio on capacity and deflection of reinforced concrete two-way slabs. Three steel reinforcement ratios are considered which are minimum, maximum and average of them in addition to two concrete compressive strength    values of 20 and 30 MPa. The results from experimental work show that increasing the reinforcing steel ratio leads to increase the ultimate capacity of the slab in addition to decrease the maximum deflection. For slabs with    = 20 MPa, increasing the reinforcing steel ratio from the minimum to the maximum, i.e. 600 %, leads to increase ultimate capacity by about 156 % and decrease maximum deflection by about 52 %. Wheras, For slabs with    = 30 MPa, increasing the reinforcing steel ratio from the minimum to the maximum, i.e. 900 %, leads to increase ultimate capacity by about 155 % and decrease maximum central deflection by about 27 %. In addition, matmatical expresions for load-deflection relationships are presented in the current study. Keyword head: Two-way slab, Deflection, RC, simply supported, ultimate capacity, expression. Cite this Article: Khattab Saleem Abdul-Razzaq, Abbas H. Mohammed and Taha K. Mohammedali, Suggesting Deflection Expressions for Rc 2-Way Slabs, International Journal of Civil Engineering and Technology, 10(02), 2019, pp. 382–392 http://www.iaeme.com/IJCIET/issues.asp?JType=IJCIET&VType=10&IType=02 1. INTRODUCTION Engineering structures are constructed from materials that deform slightly when subjected to stressing. As a result of thisideformation, the structures undergo certain movement called deflection. When the elastic limit of the material is not exceeded and the resulting deflections disappear in case of stress removing, this type of deformation or deflection is called elastic, otherwise, it is inelastic.