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<p>Monitoring and controlling temporary transverse braces and accurately predicting their stresses are critical to construction safety in cable-stayed tower works. This study establishes a monitoring-and-modeling framework and evaluates it on the A-shaped tower of the Songzihe Grand Bridge. Construction-stage stress measurements are acquired for the braces, and two finite-element (FE) representations are formulated: a 3D solid model and a computationally efficient beam model. To enhance predictive fidelity for the beam representation, an equivalent rotational stiffness of the brace–tower connection is derived from structural mechanics and embedded as optimized boundary conditions. Both FE models are calibrated and validated against full-scale construction data; predictive accuracy and computational cost are then compared. Results indicate that beam models with idealized pinned or fixed ends exhibit inferior stress predictions relative to the solid-model reference, whereas the optimized beam model reproduces brace stress, bending moment, and deflection with high fidelity. Its overall stress deviation is only 1.42&#xa0;MPa higher than that of the solid model while requiring 4.4% of the solid model’s CPU time. These findings demonstrate a favorable accuracy–efficiency balance for construction-stage simulation and decision support. The proposed approach enables rapid what-if assessments for monitoring-based control of temporary bracing and is readily transferable to similar cable-stayed tower projects.</p>

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Model Optimization for Monitoring Temporary Transverse Braces During Cable‑Stayed Bridge Tower Construction

  • 期刊论文

  • 发表日期：

    2026年1月10日

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  • Yangfan Lv,
  • Jinbiao Lai,
  • Guolong Wang,
  • Yanwei Niu,
  • Pingming Huang

摘要

Monitoring and controlling temporary transverse braces and accurately predicting their stresses are critical to construction safety in cable-stayed tower works. This study establishes a monitoring-and-modeling framework and evaluates it on the A-shaped tower of the Songzihe Grand Bridge. Construction-stage stress measurements are acquired for the braces, and two finite-element (FE) representations are formulated: a 3D solid model and a computationally efficient beam model. To enhance predictive fidelity for the beam representation, an equivalent rotational stiffness of the brace–tower connection is derived from structural mechanics and embedded as optimized boundary conditions. Both FE models are calibrated and validated against full-scale construction data; predictive accuracy and computational cost are then compared. Results indicate that beam models with idealized pinned or fixed ends exhibit inferior stress predictions relative to the solid-model reference, whereas the optimized beam model reproduces brace stress, bending moment, and deflection with high fidelity. Its overall stress deviation is only 1.42 MPa higher than that of the solid model while requiring 4.4% of the solid model’s CPU time. These findings demonstrate a favorable accuracy–efficiency balance for construction-stage simulation and decision support. The proposed approach enables rapid what-if assessments for monitoring-based control of temporary bracing and is readily transferable to similar cable-stayed tower projects.