Abstract
To improve the efficiency of cable force adjustment of composite saddle anchor span of single-tower single-span ground-anchored suspension bridge, a strain incremental adjustment method is proposed. The analytical calculation model is established according to the relative spatial position of the cable strand and the saddle groove of the composite saddle, and the target cable force of the cable strands is calculated by the target position of the composite saddle in the cable-stayed bridge and construction phases. Considering the coupling relationship between the cable strand and the composite saddle, the calculation formula of the change in main span main cable force and anchor span cable force after the adjustment of a single cable strand is derived. Based on the condition of equilibrium of forces along the slip surface of the composite saddle, the slip amount of composite saddle after a round of cable strand adjustment is obtained, then the adjustment amount of actual construction of the cable strands is also obtained through the strain incremental adjustment method. With the help of a numerical simulation platform, the calculation program of the cable force adjustment of composite saddle anchor span is established by an iterative solution method. In this paper, taking the Jinsha River Bridge at Hutiao Gorge as a research object, the adjustment of cable force of composite saddle anchor span is analyzed and calculated. The research results indicate that the calculated cable force is obtained by the strain incremental adjustment method, and it is similar to the measured cable force. The cable strand adjustment and optimization method avoids excessive repeated stretching and relaxation of a single cable strand in the process of multiple rounds of cable strand adjustment and reduces the amount of construction adjustment. This method can effectively reduce the times of cable strand adjustment and improve the efficiency of adjusting the anchor span cable force.
Highlights
To improve the efficiency of cable force adjustment of composite saddle anchor span of single-tower single-span ground-anchored suspension bridge, a strain incremental adjustment method is proposed. e analytical calculation model is established according to the relative spatial position of the cable strand and the saddle groove of the composite saddle, and the target cable force of the cable strands is calculated by the target position of the composite saddle in the cable-stayed bridge and construction phases
In this paper, taking the Jinsha River Bridge at Hutiao Gorge as a research object, the adjustment of cable force of composite saddle anchor span is analyzed and calculated. e research results indicate that the calculated cable force is obtained by the strain incremental adjustment method, and it is similar to the measured cable force. e cable strand adjustment and optimization method avoids excessive repeated stretching and relaxation of a single cable strand in the process of multiple rounds of cable strand adjustment and reduces the amount of construction adjustment. is method can effectively reduce the times of cable strand adjustment and improve the efficiency of adjusting the anchor span cable force
Compared with the common saddle of the multitower suspension bridge, the composite saddle on the single-tower suspension bridge has the functions of both tower saddle and splay saddle. e change of the saddle position will lead to the change of the main cable shape of the main span and the anchor span cable force. e anchor span of the composite saddle is controlled by the cable strand tension [1,2,3], and the accuracy of cable force adjustment will affect the reliability of the overall structure of the suspension bridge [4,5,6,7,8,9]. e composite saddle is directly connected with the main cable of the main span
Summary
E composite saddle is a unique structure of a single-tower single-span ground-anchored suspension bridge. It is located on the buttress platform between the main span and the anchor span and plays the role of supporting, deflecting, and dispersing the main cable. E cable strand ends the horizontal bending deflection first, the vertical bending deflection, and be pulled to the position of the corresponding anchor point on the anchor surface. E composite saddle slides in the longitudinal direction along the horizontal plane of the buttress, which changes the tangent point of the cable strand at the anchor span side in the saddle groove, resulting in the changes of the coordinates of Point e, the unstressed length of the suspended segment of the cable strand and the cable force of the cable strand
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