Hesham Haggag | Helwan University (original) (raw)
Papers by Hesham Haggag
Engineering Research Journal, Dec 1, 2020
Известия Казанского государственного архитектурно-строительного университета, 2010
SSRG international journal of civil engineering, Dec 25, 2015
Journal of Engineering Research and Reports, Aug 7, 2019
Lifeline Earthquake Engineering, 1995
... Enhanced Seismic Design of Reinforced Concrete Bridge Supporting Elements. by Medhat A. Harou... more ... Enhanced Seismic Design of Reinforced Concrete Bridge Supporting Elements. by Medhat A. Haroun , Hesham A. Haggag , and Ayman E. Salama pp. 439-446 Purchase Information Permissions for Reuse Document type: Conference Proceeding Paper. ...
Buildings
The current study presents an experimental investigation performed on slender reinforced concrete... more The current study presents an experimental investigation performed on slender reinforced concrete shear walls, representing a common lateral-load resisting system of mid-rise buildings. The walls were reinforced with steel and glass fiber-reinforced polymer (GFRP) bars and tested up to failure under reversed quasi-static cyclic loading to investigate the capability of GFRP bars in reinforcing RC shear walls under seismic loads. Moreover, the effect of the GFRP reinforcement ratio on the structural response, deformation performance, and failure mode resulting in RC walls, compared with its behavior when reinforced with steel bars, is also investigated. Six full-scale shear walls with an aspect ratio of 3.25 were constructed. The reference wall was entirely reinforced with steel bars. Two specimens were reinforced by hybrid scheme of GFRP–steel bars. The remaining three shear walls were entirely reinforced with GFRP bars. The overall performance of each wall was characterized by inves...
Composite Structures, 2003
Engineering Research Journal
This paper presents an experimental study that investigated the mechanical, physical, and durabil... more This paper presents an experimental study that investigated the mechanical, physical, and durability characterization of square glass fibre-reinforced polymer (GFRP) bars exposed to alkaline solution. The GFRP square bars were exposed to alkaline solution at 22, 40, and 60°C to accelerate the effect of the concrete environment. The measured tensile strengths of the GFRP square bars before and after exposure were considered as a measure of the durability performance of the specimens and were used for long-term properties prediction based on the Arrhenius theory. The test results showed the very high long-term durability of square GFRP bars exposed to alkaline solutions. According to the predictions, even after a service life of 100 years at 32 o C , the tensile-strength retention of the tested GFRP bars would still be over 95% for GFRP square bars.
This paper presents an experimental study that investigated the mechanical, physical, and durabil... more This paper presents an experimental study that investigated the mechanical, physical, and durability characterization of square glass fibre-reinforced polymer (GFRP) bars exposed to alkaline solution. The GFRP square bars were exposed to alkaline solution at 22, 40, and 60°C to accelerate the effect of the concrete environment. The measured tensile strengths of the GFRP square bars before and after exposure were considered as a measure of the durability performance of the specimens and were used for long-term properties prediction based on the Arrhenius theory. The test results showed the very high long-term durability of square GFRP bars exposed to alkaline solutions. According to the predictions, even after a service life of 100 years at 32oC, the tensile-strength retention of the tested GFRP bars would still be over 95 % for GFRP square bars.
Lifeline Earthquake Engineering, 1995
... Enhanced Seismic Design of Reinforced Concrete Bridge Supporting Elements. by Medhat A. Harou... more ... Enhanced Seismic Design of Reinforced Concrete Bridge Supporting Elements. by Medhat A. Haroun , Hesham A. Haggag , and Ayman E. Salama pp. 439-446 Purchase Information Permissions for Reuse Document type: Conference Proceeding Paper. ...
International Journal of Civil Engineering, 2015
Stability of multi-story one-bay space pallet racking system studied experimentally and theoretic... more Stability of multi-story one-bay space pallet racking system studied experimentally and theoretically to obtain the buckling length and the critical load for the upright of the racking system considering the beam-column connection, and frame bracing pattern. Five samples of space pallet racking system are studied to obtain the critical load and buckling lengths with different cases of loading, in addition two samples of short upright of the racking system are investigated under axial compression loads to carry out the upright capacity. The experimental results are re-evaluated using both the American Code of Racking (RMI 2012), and the European code of Racking (EN15512), moreover the investigated system are modeled and analyzed using SCIA Engineer software. The modes of failure of the experimented samples are recorded and evaluated. The experimental program has been conducted on the pallet racks using full-scale models.
The performance of coupling beams under cyclic loadings is evaluated when they have openings with... more The performance of coupling beams under cyclic loadings is evaluated when they have openings with different configuration. The study is performed through experimental examination on four reduced scale coupling beams. The testing is done in the Concrete Laboratory at the Housing and Building National Research Center, Cairo, Egypt. Square openings are constructed on three specimens with different configurations whereas the fourth specimen kept without openings for the comparison matter. Two openings are fabricated at top and bottom of the diagonal bars in one beam specimen. Another specimen contains two openings at left and right of the diagonal bars. The last specimen has four square openings placed at top-bottom and left-right of the diagonal bars of the coupling beam. The yield and ultimate tensile strength of the reinforcement steel bars are 510 and 720 MPa, respectively with elastic modulus of 200 GPa. The concrete characteristic strength is 38 MPa. All specimens were tested unde...
Following the 1989 Loma Prieta earthquake, the California Department of Transportation intensifie... more Following the 1989 Loma Prieta earthquake, the California Department of Transportation intensified its efforts to verify and, if necessary, upgrade the seismic design of the structural components of highway bridges. The very early design procedures of pier walls assumed that these structural components behave as shear walls subjected to equivalent static loading. Lateral loads in the direction of the weak axis (flexural) of such walls were not considered in the design. As a result of this assumption, the pre-1971 pier wall design used relatively small reinforcement ratios in both the vertical and horizontal directions. The current design of bridge pier walls has employed clear measures to improve the seismic performance of pier walls, specifically in the weak direction, such as increasing the steel ratios of the vertical and the horizontal reinforcements, placing the horizontal reinforcement on the outside of the vertical bars, and extending the vertical bars into the foundation, th...
INTERNATIONAL JOURNAL OF CIVIL ENGINEERING AND TECHNOLOGY (IJCIET), 2020
Materials Sciences and Applications, 2015
Engineering Research Journal, Dec 1, 2020
Известия Казанского государственного архитектурно-строительного университета, 2010
SSRG international journal of civil engineering, Dec 25, 2015
Journal of Engineering Research and Reports, Aug 7, 2019
Lifeline Earthquake Engineering, 1995
... Enhanced Seismic Design of Reinforced Concrete Bridge Supporting Elements. by Medhat A. Harou... more ... Enhanced Seismic Design of Reinforced Concrete Bridge Supporting Elements. by Medhat A. Haroun , Hesham A. Haggag , and Ayman E. Salama pp. 439-446 Purchase Information Permissions for Reuse Document type: Conference Proceeding Paper. ...
Buildings
The current study presents an experimental investigation performed on slender reinforced concrete... more The current study presents an experimental investigation performed on slender reinforced concrete shear walls, representing a common lateral-load resisting system of mid-rise buildings. The walls were reinforced with steel and glass fiber-reinforced polymer (GFRP) bars and tested up to failure under reversed quasi-static cyclic loading to investigate the capability of GFRP bars in reinforcing RC shear walls under seismic loads. Moreover, the effect of the GFRP reinforcement ratio on the structural response, deformation performance, and failure mode resulting in RC walls, compared with its behavior when reinforced with steel bars, is also investigated. Six full-scale shear walls with an aspect ratio of 3.25 were constructed. The reference wall was entirely reinforced with steel bars. Two specimens were reinforced by hybrid scheme of GFRP–steel bars. The remaining three shear walls were entirely reinforced with GFRP bars. The overall performance of each wall was characterized by inves...
Composite Structures, 2003
Engineering Research Journal
This paper presents an experimental study that investigated the mechanical, physical, and durabil... more This paper presents an experimental study that investigated the mechanical, physical, and durability characterization of square glass fibre-reinforced polymer (GFRP) bars exposed to alkaline solution. The GFRP square bars were exposed to alkaline solution at 22, 40, and 60°C to accelerate the effect of the concrete environment. The measured tensile strengths of the GFRP square bars before and after exposure were considered as a measure of the durability performance of the specimens and were used for long-term properties prediction based on the Arrhenius theory. The test results showed the very high long-term durability of square GFRP bars exposed to alkaline solutions. According to the predictions, even after a service life of 100 years at 32 o C , the tensile-strength retention of the tested GFRP bars would still be over 95% for GFRP square bars.
This paper presents an experimental study that investigated the mechanical, physical, and durabil... more This paper presents an experimental study that investigated the mechanical, physical, and durability characterization of square glass fibre-reinforced polymer (GFRP) bars exposed to alkaline solution. The GFRP square bars were exposed to alkaline solution at 22, 40, and 60°C to accelerate the effect of the concrete environment. The measured tensile strengths of the GFRP square bars before and after exposure were considered as a measure of the durability performance of the specimens and were used for long-term properties prediction based on the Arrhenius theory. The test results showed the very high long-term durability of square GFRP bars exposed to alkaline solutions. According to the predictions, even after a service life of 100 years at 32oC, the tensile-strength retention of the tested GFRP bars would still be over 95 % for GFRP square bars.
Lifeline Earthquake Engineering, 1995
... Enhanced Seismic Design of Reinforced Concrete Bridge Supporting Elements. by Medhat A. Harou... more ... Enhanced Seismic Design of Reinforced Concrete Bridge Supporting Elements. by Medhat A. Haroun , Hesham A. Haggag , and Ayman E. Salama pp. 439-446 Purchase Information Permissions for Reuse Document type: Conference Proceeding Paper. ...
International Journal of Civil Engineering, 2015
Stability of multi-story one-bay space pallet racking system studied experimentally and theoretic... more Stability of multi-story one-bay space pallet racking system studied experimentally and theoretically to obtain the buckling length and the critical load for the upright of the racking system considering the beam-column connection, and frame bracing pattern. Five samples of space pallet racking system are studied to obtain the critical load and buckling lengths with different cases of loading, in addition two samples of short upright of the racking system are investigated under axial compression loads to carry out the upright capacity. The experimental results are re-evaluated using both the American Code of Racking (RMI 2012), and the European code of Racking (EN15512), moreover the investigated system are modeled and analyzed using SCIA Engineer software. The modes of failure of the experimented samples are recorded and evaluated. The experimental program has been conducted on the pallet racks using full-scale models.
The performance of coupling beams under cyclic loadings is evaluated when they have openings with... more The performance of coupling beams under cyclic loadings is evaluated when they have openings with different configuration. The study is performed through experimental examination on four reduced scale coupling beams. The testing is done in the Concrete Laboratory at the Housing and Building National Research Center, Cairo, Egypt. Square openings are constructed on three specimens with different configurations whereas the fourth specimen kept without openings for the comparison matter. Two openings are fabricated at top and bottom of the diagonal bars in one beam specimen. Another specimen contains two openings at left and right of the diagonal bars. The last specimen has four square openings placed at top-bottom and left-right of the diagonal bars of the coupling beam. The yield and ultimate tensile strength of the reinforcement steel bars are 510 and 720 MPa, respectively with elastic modulus of 200 GPa. The concrete characteristic strength is 38 MPa. All specimens were tested unde...
Following the 1989 Loma Prieta earthquake, the California Department of Transportation intensifie... more Following the 1989 Loma Prieta earthquake, the California Department of Transportation intensified its efforts to verify and, if necessary, upgrade the seismic design of the structural components of highway bridges. The very early design procedures of pier walls assumed that these structural components behave as shear walls subjected to equivalent static loading. Lateral loads in the direction of the weak axis (flexural) of such walls were not considered in the design. As a result of this assumption, the pre-1971 pier wall design used relatively small reinforcement ratios in both the vertical and horizontal directions. The current design of bridge pier walls has employed clear measures to improve the seismic performance of pier walls, specifically in the weak direction, such as increasing the steel ratios of the vertical and the horizontal reinforcements, placing the horizontal reinforcement on the outside of the vertical bars, and extending the vertical bars into the foundation, th...
INTERNATIONAL JOURNAL OF CIVIL ENGINEERING AND TECHNOLOGY (IJCIET), 2020
Materials Sciences and Applications, 2015