By Guohao Li

This publication displays the sensible event the authors have received in interpreting the field girder and the truss utilized in bridge engineering; the directly and curved field girder bridge, the truss bridge, and the arch-stiffened truss bridge are thought of, wherein bending and torsional stresses, lateral buckling and vibrations are investigated. The authors have proven a extra actual thin-walled beam thought of field girder, and, as an extension of the thin-walled beam concept, built a thought of bending and torsion of the truss bridge. Many functional examples were analyzed, and from those effects, conclusions important to layout perform were deducted.

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**Example text**

Define the velocity value on the axis OX. 19). On the ray A1 A2, the velocity varies from 0 to u 0 and the real part of the Joukowski function Re ω decreases from ∞ down to 0. The direction of the velocity does not change, the angle to the axis OX θ = 0, and, respectively, Im ω = 0. On the line A2 A3, the velocity equals u 0 and Re ω and the imaginary part of the Joukowski function Im ω varies from 0 to −π. On the line A3A1, Re ω increases from 0 to ∞ and Im ω = −π. 20). 17) using the Schwarz–Christoffel formula: ω = C1 t ∫ 0 dt + C2 .

37) t +1 +1 ⎥⎦ The constant C1 is determined from the correspondence of the point A3 in the planes t and z. 17). 37 we obtain −∞ = C1 δ ⎡2 − ∞ − i(π + 2) ⎤⎦ + iB. 17 Parametric plane. Bπ . We have to now determine the half-width (π + 2)δ of the jet at infinity δ. 17). 37, we obtain −∞ + iδ = C1 δ ⎡2 − ∞ + iπ − i(π + 2) ⎤⎦ + iB. 37, we obtain z= B ⎡ ⎢2 π + 2 ⎢⎣ ( ) t + 1 + t + ln t +1 −1⎤ ⎥ . 40) t + 1 + 1 ⎥⎦ The complex velocity in the plane z is dw dw dt = =− dz dt dz ( u0 t +1 + t ) . 41) The algorithm to calculate the axial velocity at a slot-type suction built into a flat infinite wall consists of the following steps: 1.

The formula x = ⎢⎣ 2 π ⎦ parameter t. u0 3. The formula ux = − 2 is used to calculate the axial velocity of the air at x. Perform the step x = x + Δx and return to Step 2. Calculate until the predetermined point is reached. 4) show that a suction unit built in a flat wall is more efficient just similar to the unseparated flow model. 21). A series of articles [124] contain detailed descriptions of the development of design ratios using the complex variable theory. 21 Slot-type suction bell with two vortex zones.