الفهرس 
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Abstract
This study investigated experimentally the structural behavior of flat plate rested on coupled columns and evaluated the effects of opening on their punching shear capacities.
In the scope of the research program, a total of fourteen two-way RC slabs with dimensions of 1000 X 1000 X 70 mms were prepared and tested experimentally. The test specimens were manufactured with two square RC columns stubs with 100 mm length and 150 mm height. The column stubs are located at the center of the slab and all slabs stay symmetric about the two axes as the place of the columns were changing with respect to the center line of the slab. All the test specimens have Ф 10 mm@190 mm in each direction as the slab flexural steel reinforcement in tension side, with the clear concrete cover for steel bars of 15 mm. The column stubs have Ф10 at each corner as longitudinal reinforcement and φ 6 mm @65 mm as stirrups. The test program divided into four slabs without opening and with a different separation distance between columns. Eight slabs having a square opening of 100 mm length, and constant separation distance of 50 mm between coupled columns. The remaining two slabs having more than one opening of 100 mm length, and constant separation distance of 50 mm between coupled columns. The studied parameters are the separation distance between the two columns (X= d, 2d, 3d, and 4d), location of opening (Parallel, diagonal, and perpendicular) to the axis of the two columns, the distance from the opening to the column face (S= 0, 0.5d, d, 1.5d, 2d, and 3d), and number of opening ( n = 1, 2, and 3 ).