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There have been many other valuable contributions to the literature as well. Shen analyzed the shear lag effect of the main beam of a wide and short tower cable-stayed bridge to explore the warping displacement function caused by shear lag. established a plate and shell finite element model for simply supported and continuous beams to assess the influence of finite element mesh size, load mode, width to height ratio, and width to span ratio on the stress of the box girder’s wing slab. used the finite element method to observe the influence of a concrete box beam with various flange depths along the orientation of cross section. Wu and Hong established a 3D finite element model of a bridge to study the shear lag effects of cable-stayed bridges, where shear lag coefficients varied in different locations along the longitudinal axis of the bridge. Chang et al., for example, used the principle of minimum potential energy to analyze the shear lag effects of thin-walled trapezoidal box sections with inclined stiffeners in the cell they found that the bridge segment presents bending stress and axial stress simultaneously and assumed the parabolic transverse change of the axial force on the section. The variational principle of potential energy has been used by previous researchers to analyze the theoretical shear lag effects in concrete box beams. The bridge codes of various countries prescribe effective width calculation methods for special structures such as simply supported beams, continuous beams, and cantilever beams, but there is no clear stipulation for cable-stayed bridge designs. The effective width is generally used to replace the actual width of the flange to calculate the effect of shear lag on box girders. Shear lag causes uneven distribution of normal stress in the flange plates, which is one of the main causes of cracks in concrete box section girders.
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The shear lag effect of the box girder flange is serious under compression and bending loads, and the normal stress is highly complex. The main girder, a single-cable plane cable- (PC-) stayed bridge, is generally in box section form. The section shear lag coefficient can be obtained by linear interpolation of the beam section between the cable action point and the middle of the span. In the midspan beam section between the action points of cable forces, the shear lag coefficient of the bending moment reflects the actual stress. In the beam segments between the cable forces, the shear lag coefficient determined by the ratio of the bending moment to the axial force reflects the actual stress at the cable force action point. The results show that finite element analysis of the plane bar system should be conducted at different positions in the bridge under construction the calculated shear lag coefficient of the cable force acting at the cable end of the cantilever reflects the actual force. The shear lag distribution law in the box girder of the single-cable-plane prestressed concrete cable-stayed bridge along the longitudinal direction was determined in order to observe the stress distribution of the girder. After a hanging basket load was applied, the main beam of certain sections showed alternating positive and negative shear lag characteristics. The stress value of the cable tension area of the main beam upper edge was found to markedly change when tensiling the cable force and was accompanied by prominent shear lag effect. The experimental and theoretical results were compared in an example of loading the control section. A model test and finite element analysis were conducted in this study to determine the distribution law of shear lag effect in the main beam section, a box girder, during the cable-stayed bridge construction process.