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Implications of subsoil-foundation modelling on the dynamic characteristics of a monitored bridge

机译：子机基础建模对监测桥梁动态特性的影响

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摘要

Model updating based on system identification (SI) results is a well-established procedure to evaluate the reliability of a developed numerical model. In this inverse assessment problem, soil-foundation compliance is often not explicitly considered rigorously during design and/or purely numerical assessment. The present work aims to investigate the correlation between subsoil-foundation stiffness and modal characteristics of bridges, as a means to identify a threshold beyond which rigorous subsoil modelling is a prerequisite for reliable model updating. The second Kavala Ravine Bridge, in Greece, serves as the case study for this purpose for which a reasonably reliable finite element (FE) model is developed and updated based on ambient vibration measurements. Alternative soil profiles and subsequently redesigned foundation systems are then used to examine the effect that the correspondingly variable soil compliance would have on the natural frequencies of the bridge. It is shown that soil stiffness alone is not an adequate proxy to decide on the necessity for subsoil modelling, as the foundation stiffness (particularly in cases of softer soil profiles) tends to balance the dynamic properties of the holistic soil-foundation system. The soil-foundation stiffness is therefore the key parameter that dictates the need for refined modelling of soil-structure interaction in the framework of SI-based model updating.
机译：基于系统识别（SI）结果的模型更新是一种熟悉的过程，以评估开发的数字模型的可靠性。在这一逆评估问题中，在设计和/或纯粹数值评估期间，土壤基础合规性通常不会严格被明确地考虑。目前的工作旨在研究桥桥的底层基础刚度和模态特性之间的相关性，作为识别超出阈值的手段，超出了严格的底层建模是可靠模型更新的先决条件。希腊的第二个Kavala Ravine Bridge是为此目的的案例研究，该目的是基于环境振动测量来开发和更新合理可靠的有限元（FE）模型。然后，使用替代土壤剖面和随后重新设计的基础系统来检查相应变量的土壤依从性对桥的自然频率的影响。结果表明，单独的土壤刚度不是确定底土模拟的必要性的足够代理，因为基础刚度（特别是在较软的土壤型材）倾向于平衡整体土基础系统的动态性质。因此，土壤基础刚度是指示基于SI的模型更新框架中的土壤结构相互作用精细建模的关键参数。

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