受弯习题及谜底(国外英文资料).doc

受弯习题及答案(国外英文资料) The rectangle beam, C30 concrete, HRB400 bar, calculate the maximum bending moment design value for the beam in three cases. (1) the vertical tensile steel is matched by 2, 14 (= 308mm2); (2) the vertical tensile steel is matched by 3, 25 (= 1473mm2); (3) the vertical tensile steel is matched by 825 (= 3927mm2). [the solution], , take The first situation: 1, do you know if you have less reinforcement? A row of tensile steel, (less reinforcement beam) 2, The second scenario: 1, do you know if you have less reinforcement? A row of tensile steel, (a lot) Whether the test is a super-reinforced beam: Will: (not the tendons) 3, Third scenario: 1, do you know if you have less reinforcement? Lets put two rows of bars, (a lot) Whether the test is a super-reinforced beam: Will: (super steel beam) 3, Rectangular beam, size, moment design value, C30 concrete, HRB400 bar, please: (1) longitudinal reinforcement required. (2) the longitudinal reinforcement required for the calculation of the compression steel bar 3 22 () in the compression area. The total amount of steel is compared with the 6th, and the conclusion is drawn. In the pressurized area, the compression steel 2 14 () is configured to calculate the required longitudinal reinforcement. (4) the longitudinal reinforcement required for the calculation of compression steel is already configured in the compression zone. (1) the idea of the problem: because the design of the cross section is more than the value of the bending moment, it should be checked whether it is a hyperbar component and whether it is designed to be a double beam. If you need to design a double reinforcement beam, must introduce the third condition, the maximum play to the role of the concrete, the total amount of steel as a minimum, assuming, or; In addition, for the components that need to be designed as a double beam, the area of the vertical tensile steel is very large, and the two rows should be arranged. [the solution], Its expected