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Board pull the bridge live load calculated using the method just


Should also mention, for the Heavy component, multi-point lifting method to be used; for the rib, in order to prevent lateral tipping phenomenon, the need to connect the two hanging points in the plane of the center section of rib shaft bending over. Fan-shaped opening, under the thick thin, and the elevation of small beam size of the tower side-side large so that the main beam in the drawing board with the contact form at just a big field, as shown in Figure 1. This article describes the operation of the bridge into the state of the calculation of live load just by properly selecting arm, according to bar system to simplify the calculation. Figure 1 is a single tower and single-sided four-lane bridge, the stiffness from the structural point of view. According to Figure 3 A a) thick line shows the two-cut arm and 3 by a hoard b) thick line shows the three-cut arm to select a result, the following were the first one in Figure 3 a), Figure 3 a b) two kinds of selection methods were just to calculate arm. l / 2 side of the l / 2 profile of a single panel pull 1B0nB Figure l J. Bridge Two newly constructed arm of the Department of selection method 2, the calculated results shown in Figure 3, let 0 pull plate axis and the intersection of the main beam axis. 12,13 (45) were the main beam axis and pull board vertical axis. 0 to 12 with the 0-13 section of the formation of Figure 3 a section of a) thick line shows the second yoke; in the second arm on the basis of newly added section of the formation of 0 to 45 Figure 3 - b) thick line shows the three yoke. Figure 2,[link widoczny dla zalogowanych], the general cross-section main beams, four rooms for the single box. Section properties are: cross-sectional area A of a 9.227m, the bending moment of inertia J of a 4.699 m,[link widoczny dla zalogowanych], the upper edge of the neutral section from the wheelbase. A l504000.678m, from the lower edge of the neutral section wheelbase h-1. Z32in, a flexural modulus of W 6.931m. , W ... a 3.814m. . . ,[link widoczny dla zalogowanych]! Figure 2, the general cross-section girder a) = just the method of selecting arm 80 in Figure 3 the selection of the two treatment arms just b) j select the side arm just rumors sr · 17 · order to investigate the accuracy of just using the method of calculation used 9 node isoparametric plane for checking calculations. To this end the following simplified calculation as follows: the actual four-room section of a single box by bending moment of inertia into a rectangular cross section is equal. General cross-section into the main beam of high 1.9m. Rectangular cross-section width 8.22lm. Root section into high 3.2m. 8.2 ¨ m wide rectangular cross-section. The actual drawing board is relying on the tower side of thick,[link widoczny dla zalogowanych], thin by the end of the main beam, reduced to equal thickness 0.5m. Consider a trailer load of 120 t, as shown in Figure l. Shear area by the rectangular cross-section as A result of a sorting feature A/1.2 section A-A position as shown in Figure l iB-B changes the main beam points in the cross-section; c-c in the drawing board over the mid-point axis section. A-A, B-B, c-c cross-section (trailer load of the bridge span), respectively, by the pier side of the rod end by internal forces to organize the lower edge of the point, neutral point, on the edge of the stress and principal stress. 2.1 Calculation of the two arms just bad l - R! Arm results (;) (MP8) () (M a Pa) (M ~ Pa) (bad arm just 2 dollars renovating the three results () () () (MP'a) (MPa) () Figure 3 - a) below. At this point pull the whole bridge plate with four yoke of the frame system, the results shown in Table 1. Its 18 * in \. 2.2 Calculation of the three yoke as shown in Figure 3 - b) below, then pull the whole bridge plate with six yoke of the frame system, the results shown in Table 2. The symbolic significance in the same \1. \Other symbols with \Decline of 3 node isoparametric plane 9 results dots (。)(()( MPa1 (goods) (4 Conclusion compared in Table 1, Table 2, Table 3 ... .... It can be seen; 4.1 and two yoke The results just arm three or less,[link widoczny dla zalogowanych], indicating that in Figure 3 a b) 0 to 45 in the first arm of the section is weak. 4.2 three yoke and check the results of the calculated results closer. Note in Figure 3 - b) method to determine the three-yoke, pull the bridge plate can make the whole system of complex structure is simplified as a rigid arm with a six frame system, which simplifies the board pull the bridge live load operating state of the internal force calculation.
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