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Experimental Study on Steel Reinforced Concrete Torsional Members

Author: LiHongBo
Tutor: QinShiHong
School: Chongqing University
Course: Structural Engineering
Keywords: Steel reinforced concrete Torsion specimens Cracking Torque Torsion bearing capacity Torsional rigidity
CLC: TU398.9
Type: Master's thesis
Year: 2008
Downloads: 93
Quote: 3
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Abstract


The torsion performance of steel reinforced concrete (SRC) member 4 SRC specimens and two ordinary reinforced concrete (RC) the pure torque under test to the test piece . Specimen design rate of the main parameters of stirrup reinforcement ratio and section steel containing steel , composed of four groups of the test piece . Test with one end embedded solid , one end of the free torsion force model , monotonous static the grading load the test method consists of two synchronized jack symmetry acts on the free end of the specimen loading beams torque . Describes and analyzes the SRC specimens and RC specimens carried out by the twist in the whole process of crack morphology and failure characteristics , as well as torsional deformation law ; groups analysis of the test results of the test piece and demonstration stirrup reinforcement ratio , section steel and steel reinforced steel rate torsion specimen . The results show that : increase the role of the reinforced and steel, the specimen cracking torque can be negligible , according to Su concrete members SRC member cracking torque ; shaped steel greatly improved torsional load carrying capacity of the specimen by the torsional stiffness and post and significantly improve its ductility ; stirrup ratio is increased SRC specimen torsion carrying capacity has increased significantly ; increase the reinforcement ratio and section steel steel ratio can also increase the carrying capacity of the torsion of the SRC specimens , but the effect is not as good as increasing The stirrup rate significantly . Finally, explore the SRC components pure torsion cracking torque and twist carrying capacity formula preliminary proposals do not consider the increased role of the steel bars and sections , in terms of plain concrete members of its cracking torque ; by twisting bearing capacity of reinforced concrete resistance items and section steel resistance items bearing capacity increase factor 1γ to reflect the interaction between the steel and concrete contribution of twist - carrying capacity , formula ( 5.8 ) can basically reflect SRC member torsion bearing capacity , its physical meaning more explicit , as the relevant norms and further research .

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