Abstract
The present study aims to address the instability mode of the concrete spherical joint in order to guarantee the safety of the rotating process of the swing bridge. A new critical overturning moment model is proposed to calculate the overturning moment of swing bridge based on the non-Hertz contact theory, and it is validated against the engineering application of the Nandu River Swing Bridge construction. The research indicates that the Non-Hertz contact theory has superiority compared to the widely applied simplified formulation on the spherical joint surface stress calculation, by contrasting the results of the finite element model and the data collected during field monitoring. Furthermore, the resistance of the overturning coefficient is calculated, and the result turns out that the critical resistance of the overturning coefficient based on the Non-Hertz contact theory is closer to the measured values compared to the simplified algorithm. The present research demonstrates the applicability of applying the new proposed formula to guarantee the safety of the rotating process during the swing bridge construction.
Highlights
Rotating method [1,2,3,4] is an innovative bridge construction method that gains increasing popularity in recent years
A new critical overturning moment model is proposed to calculate the overturning moment of swing bridge based on the non-Hertz contact theory, and it is validated against the engineering application of the Nandu River Swing Bridge construction
The research indicates that the Non-Hertz contact theory has superiority compared to the widely applied simplified formulation on the spherical joint surface stress calculation, by contrasting the results of the finite element model and the data collected during field monitoring
Summary
Rotating method [1,2,3,4] is an innovative bridge construction method that gains increasing popularity in recent years. Che [17] studied the overturning moment problem of swing bridge during the construction process, and a vertical compressive stress formula on the contact surface of spherical joints was deduced by using the boundary action concen tration theory of half-space body, and a formula of the critical overturning moment was derived. Developed formulas based on the Non-Hertz contact theory will be more suitable for spherical conformal contact [28], which can better reflect the distribution of contact stress on the surface of the spherical joint. They have greater accuracy than the method of simplifying the spherical joint directly into the plane for calculating the contact stress. In the Supplementary material, the stress distributions and proposed formula for overturning moment calculation are verified by literature case study [29]
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