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双筋矩形截面受弯构件正承载力计算(国外英文资料).doc

双筋矩形截面受弯构件正承载力计算(国外英文资料).doc

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双筋矩形截面受弯构件正承载力计算(国外英文资料)

双筋矩形截面受弯构件正承载力计算(国外英文资料) Double and double rib section is computed by bending member (1) the calculation of simplified figures Figure 3-19 double section bearing capacity calculation diagram In the calculation of the cross-section bearing capacity of the bending component of the double rib section, the calculation schematic is shown in figure 3-19. (2) the basic formula (1) design expressions According to the calculation schematic and internal balance condition shown in figure 3-19, the formula of basic design calculation can be listed (3-14) (3 to 15) In order to calculate the convenience, the substituting type (3-14), (3-15), is available (3-16) (3-17) The design of the compressive strength of the steel bar, which is based on table 3 in appendix 4. A s -- the area of the longitudinal steel section of the pressure area; A - the distance from the compression bar to the edge of the compression zone. (2) applicable conditions 1) in the same way as a single reinforcement section, the requirement is to avoid the occurrence of hypertendons Factor or less factor b (18) 3 - It is required that the stress of compression reinforcement can meet the design value of compressive strength X is greater than 2a prime. Because if the x value is too small, too close to neutral axis compression steel, will not enough, the deformation of the stress value was less than the compressive strength design, and therefore cannot set up basic formula. The bending moment of the double rib section is larger, and the tensile reinforcement of the corresponding configuration is more, and the condition of not having to calculate rho is greater than that of rho min. (3) the formula for the calculation of x 2a Figure 3-20 x 2a is a double section diagram For x 2a prime, the compression bars should not be able to reach fy. At this point, the pressure of the compression steel is assumed to be applied to the same line, and the pressure of the pressure is applied to the steel bar (figure 3-20). The fo

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