BEHAVIOR OF LIGHTWEIGHT REINFORCED CONCRETE BEAMS WITH OPENINGS IN SHEAR ZONES
Mohamed Ibrahim Mohamed Ahmed;
Abstract
The construction of modern buildings requires many pipes and ducts to accommodate necessary services such as air conditioning, electricity, telephone, and computer network. Passing the required service through web openings in these beams is more desirable than passing it underneath the beams to keep of building aesthetics, also decrease the total height of building as well as decreases the total construction cost.
Many researches were prepared to investigate the effect of openings on strength and stiffness of the reinforced concrete beams under different conditions to get suitable solutions to avoid or reduce these effects. Also, this research has been prepared to study the effect of a rectangular opening on the behavior of simply-supported lightweight, mixed and normal reinforced concrete beams with rectangular cross section using a nonlinear finite element program (ANSYS 17.2).
For this purpose, a set of fifty one beams were analyzed to study the behavior of beam with opening under different conditions. All tested beams were simply supported beams with 4050 mm long, 3750 mm span, and cross section of (200 mm width and 500 mm total depth). Main parameters were: opening length (W), opening height (h), position of the opening along the beam axis (X), type of concrete, ultimate compressive strength (f_cu) and reinforcement arrangement around opening. The wide range for these parameters was taken as follows: W= (0.42 d, 0.65 d, 0.85 d and 1.30 d), where d is the beam effective depth; h= (0.28 d, 0.45 d, 0.56 d, and 0.67 d); X= (0.50 d, 0.75 d, 1.0 d, and 1.25 d); fcu = 21 MPa for Lightweight, 41 MPa for normal weight, and 26 MPa for mixed concrete. The reinforcement arrangement around the opening at top and bottom chord As1= (0.64 As, 0.36 As, 0.12 As, and without RFT) where As is the main longitudinal reinforcement of the beam. Spacing between main stirrups equal to 200 mm and spacing between stirrups around opening equal to 50 mm.
Many researches were prepared to investigate the effect of openings on strength and stiffness of the reinforced concrete beams under different conditions to get suitable solutions to avoid or reduce these effects. Also, this research has been prepared to study the effect of a rectangular opening on the behavior of simply-supported lightweight, mixed and normal reinforced concrete beams with rectangular cross section using a nonlinear finite element program (ANSYS 17.2).
For this purpose, a set of fifty one beams were analyzed to study the behavior of beam with opening under different conditions. All tested beams were simply supported beams with 4050 mm long, 3750 mm span, and cross section of (200 mm width and 500 mm total depth). Main parameters were: opening length (W), opening height (h), position of the opening along the beam axis (X), type of concrete, ultimate compressive strength (f_cu) and reinforcement arrangement around opening. The wide range for these parameters was taken as follows: W= (0.42 d, 0.65 d, 0.85 d and 1.30 d), where d is the beam effective depth; h= (0.28 d, 0.45 d, 0.56 d, and 0.67 d); X= (0.50 d, 0.75 d, 1.0 d, and 1.25 d); fcu = 21 MPa for Lightweight, 41 MPa for normal weight, and 26 MPa for mixed concrete. The reinforcement arrangement around the opening at top and bottom chord As1= (0.64 As, 0.36 As, 0.12 As, and without RFT) where As is the main longitudinal reinforcement of the beam. Spacing between main stirrups equal to 200 mm and spacing between stirrups around opening equal to 50 mm.
Other data
| Title | BEHAVIOR OF LIGHTWEIGHT REINFORCED CONCRETE BEAMS WITH OPENINGS IN SHEAR ZONES | Other Titles | سلوك الكمرات الخرسانية المسلحة خفيفه الوزن ذات الفتحات بمناطق القص | Authors | Mohamed Ibrahim Mohamed Ahmed | Issue Date | 2017 |
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