Boroń Paweł, Drygała Izabela, Dulińska Joanna Maria, Burdak Szymon
Faculty of Civil Engineering, Cracow University of Technology, 31-155 Cracow, Poland.
TechnipFMC Kraków, 31-864 Cracow, Poland.
Materials (Basel). 2024 Jan 21;17(2):512. doi: 10.3390/ma17020512.
This paper aims to identify the optimal reinforced concrete bridge construction for regions at risk of mining-induced seismic shocks. This study compares the performances of two common bridge types made of the same structural tissue, i.e., a reinforced concrete beam bridge and rigid-frame bridge under real mining-induced tremors using uniform and spatially varying ground motion models. This study investigates the dynamic responses of the bridges depending on wave velocity and assesses their susceptibility to mining-triggered tremors based on the contribution of quasi-static and dynamic effects in the global dynamic responses of the bridges. This study revealed significant changes in dynamic response under spatially varying ground excitation for both bridge types. It was observed that rigid-frame bridges show higher susceptibility to quasi-static effects due to their stiffness, whereas beam bridges are more susceptible to dynamic stresses. This study recommends that in regions with mining tremors, the choice between bridge types should consider the possibility of limiting individual components of stress. A solution may involve the reduction in quasi-static components through structural reinforcement or decreasing dynamic components by using vibration absorbers. It was found that beam bridges are more cost-effective and practical in mining-affected areas, especially when founded on weak grounds.
本文旨在确定在受采矿诱发地震冲击风险地区的最佳钢筋混凝土桥梁结构。本研究使用均匀和空间变化的地面运动模型，比较了由相同结构材料制成的两种常见桥梁类型，即钢筋混凝土梁桥和刚构桥在实际采矿诱发震动下的性能。本研究根据波速研究了桥梁的动力响应，并基于准静态和动态效应在桥梁整体动力响应中的贡献评估了它们对采矿引发震动的敏感性。研究发现，对于这两种桥梁类型，在空间变化的地面激励下动力响应都有显著变化。观察到刚构桥由于其刚度而对准静态效应表现出更高的敏感性，而梁桥更容易受到动应力的影响。本研究建议，在有采矿震动的地区，桥梁类型的选择应考虑限制应力各个分量的可能性。一种解决方案可能包括通过结构加固减少准静态分量，或使用减震器降低动态分量。研究发现，梁桥在受采矿影响的地区更具成本效益和实用性，尤其是建在软弱地基上时。
