This work aims to understand the relationship between the member angle limit and the energy ratio for 24 test samples of composite beams and CFT square steel tube columns. This work also compares the formula applicabi...This work aims to understand the relationship between the member angle limit and the energy ratio for 24 test samples of composite beams and CFT square steel tube columns. This work also compares the formula applicability for member angle limit with the previous test result to provide the basic data for the design of composite beam-CFT column. The evaluation of the member angle limit was performed with concrete compressive strength (fC =22.16 MPa, 30.49 MPa), breadth-to-thickness ratio (B/t=25.0, 33.3, 43.5), and axial capacity ratio (N/N0=0, 0.3, 0.4, 0.5) as the main variables of the test samples. For the relationship between the member angle limit (Ru) and the energy ratio (ES/EC ), the test result shows that the energy ratio becomes lower as the axial capacity ratio and the breadth-to-thickness ratio increase. The energy ratio is lower for the Type B test sample compared with that of Types A and C. For the formula suggested by SATO, the test samples are distributed evenly for comparison between test values and the member angle limit; however, other formulas indicate a deviation. Specifically, for the comparison between R u,cal and R u (Test), Maeda's formula shows severe deviation.展开更多
Confinement is an effective method in order to increase concrete strength and its ductility capacity. To improve the structural properties of lightweight concrete, Fiber Reinforced Polymer （FRP） can be used to confi...Confinement is an effective method in order to increase concrete strength and its ductility capacity. To improve the structural properties of lightweight concrete, Fiber Reinforced Polymer （FRP） can be used to confine the concrete. Effect of Fiber Reinforced Polymer on confined lightweight concrete elements is one of the most important research fields. It is generally accepted that the strength and stiffness of confined concrete is higher than unconfined one. In this research, behavior of confined and unconfined concrete specimens under uniaxial loading has been studied. In order to decrease stress concentration corners of specimens were chamfered to a radius of 5 to 25 mm. The Carbon Fiber Reinforced Polymer （CFRP） and Glass Fiber Reinforced Polymer （GFRP） were used to confine lightweight concrete specimens. The stress-strain curve of specimens is compared.展开更多
基金supported by the Basic Science Research Program of the National Research Foundation of Korea (NRF) and funded by the Ministry of Education,Science and Technology (2011-0009227)
文摘This work aims to understand the relationship between the member angle limit and the energy ratio for 24 test samples of composite beams and CFT square steel tube columns. This work also compares the formula applicability for member angle limit with the previous test result to provide the basic data for the design of composite beam-CFT column. The evaluation of the member angle limit was performed with concrete compressive strength (fC =22.16 MPa, 30.49 MPa), breadth-to-thickness ratio (B/t=25.0, 33.3, 43.5), and axial capacity ratio (N/N0=0, 0.3, 0.4, 0.5) as the main variables of the test samples. For the relationship between the member angle limit (Ru) and the energy ratio (ES/EC ), the test result shows that the energy ratio becomes lower as the axial capacity ratio and the breadth-to-thickness ratio increase. The energy ratio is lower for the Type B test sample compared with that of Types A and C. For the formula suggested by SATO, the test samples are distributed evenly for comparison between test values and the member angle limit; however, other formulas indicate a deviation. Specifically, for the comparison between R u,cal and R u (Test), Maeda's formula shows severe deviation.
文摘Confinement is an effective method in order to increase concrete strength and its ductility capacity. To improve the structural properties of lightweight concrete, Fiber Reinforced Polymer （FRP） can be used to confine the concrete. Effect of Fiber Reinforced Polymer on confined lightweight concrete elements is one of the most important research fields. It is generally accepted that the strength and stiffness of confined concrete is higher than unconfined one. In this research, behavior of confined and unconfined concrete specimens under uniaxial loading has been studied. In order to decrease stress concentration corners of specimens were chamfered to a radius of 5 to 25 mm. The Carbon Fiber Reinforced Polymer （CFRP） and Glass Fiber Reinforced Polymer （GFRP） were used to confine lightweight concrete specimens. The stress-strain curve of specimens is compared.
