Abstract
Strand tension control is essential in suspension bridge safety. However, few quantitative studies have examined the bending rigidity and boundary condition behavior of strands in the anchor span of suspension bridges because of their special structure and complex configuration. In this paper, a new calculation method for strand tension is explored by using dynamic balance theory to determine the effect of bending rigidity and boundary conditions. The accuracy and effectiveness of the proposed method are tested and confirmed with verification examples and application on Nanxi Yangtze Suspension Bridge in China. The results indicated that only low-order frequency calculation could be used to calculate the strand tension without considering the effect of bending rigidity to ensure control accuracy. The influence of bending rigidity on the control precision is related to the tension and the length of the strands, which is significantly determined by the specific value between the stress rigidity and the bending rigidity. The uncertain boundary conditions of the anchor span cable, which are fixed between consolidated and hinged, also have a major effect on the control accuracy. To improve the accuracy of strand tension control, the least squares method is proposed during the tension construction control of the anchor span. This approach can significantly improve the accuracy of the tension control of the main cable strand. Some recommendations for future bridge analysis are provided based on the results of this study.
Highlights
During the erection of strands of a main cable in a suspension bridge, shape control of the main cable is mainly for the mid-span and side-span, while the inner tension control of the cable is mainlyD
The spatial position of the splay saddle is directly affected by the tension control accuracy of the anchor span, while the linear position of the side-span structure and the mid-span are directly affected by the spatial position of the splay saddle
The main cable consists of almost 100 strands, and the internal force of the main cable is equivalent to thousands of tons
Summary
During the erection of strands of a main cable in a suspension bridge, shape control of the main cable is mainly for the mid-span and side-span, while the inner tension control of the cable is mainly. The direct method is accurate and straightforward, load measurement devices are costly and fragile (Song et al, 2001; Wang et al, 2015); for example, approximately 100 strands are arranged in each anchor span of a long-span suspension bridge, which makes these strands difficult to arrange on all anchoring points To alleviate this problem, the indirect method was developed using vibration frequency of the strand, which is widely used in practice. Wang et al / Strand Tension Control in Anchor Span for Suspension Bridge Using Dynamic Balance Theory balance theory, considering the effect of the bending rigidity and the boundary conditions in particular. Some conclusions and recommendations for future strand tension control of suspension bridges are given based on the method
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