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Limitations of Structural Identification: Case Studies

机译：结构鉴定的限制：案例研究

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Structural identification (St-Id) aims to infer un-measurable but desired responses/attributes of a structure by correlating measured responses with a simulation model. Stated in a slightly different way, St-Id attempts to correlate one or more analytical models with measured data and then uses the correlated models to both estimate current attributes and forecast future performance. St-Id is a valuable tool for aiding in decision-making because when implemented properly, St-Id can estimate key metrics such as live load capacity, seismic vulnerability, etc., that cannot be directly measured or reliably estimated based on heuristics. While this approach is quite promising, there are many potential pitfalls that not only limit its effectiveness, but can also potentially result in highly misleading and unreliable results. This is an unfortunate but undeniable part of the history of St-Id, and has fueled skepticism related to the value of this paradigm. In contrast to the chosen title, the over-arching goal of this paper is to present a successful case study where St-Id has been applied to a real, operating structure. An honest discussion of some of issues that surfaced during this effort is presented, including how these issues were either directly addressed, mitigated to some extent or circumvented entirely. First a discussion of general limitations and constraints to St-Id is presented, eliminating the need for any repeated discussion in the context of the individual case study. The case study is a "typical" steel stringer bridge, where the focus is on the relationship between response modalities and on practical complications resulting from limited traffic control.
机译：结构识别（ST-ID）旨在通过将测量的响应与模拟模型相关联来推断出可测量但期望的结构响应/属性。 ST-ID以略微不同的方式表示，尝试将一个或多个分析模型与测量数据相关联，然后使用相关模型来估计当前属性和预测未来性能。 ST-ID是一个有价值的工具，用于反对决策，因为当正确实现时，ST-ID可以估计无法直接测量或基于启发式直接测量或可靠地估计的关键度量，例如Live Load Capacity，地震漏洞等。虽然这种方法非常有前途，但有许多潜在的陷阱，不仅限制了其有效性，而且可能导致高度误导和不可靠的结果。这是St-ID历史的不幸但不可否认的部分，并推动了与该范例的价值相关的怀疑。与所选择的标题相比，本文的过拱拱突出目标是呈现成功的案例研究，其中ST-ID已应用于真实的操作结构。诚实地讨论了在此努力中浮出水面的一些问题，包括如何在某种程度上直接解决这些问题或完全绕过。首先，提出了对ST-ID的一般限制和约束的讨论，消除了在各个案例研究的上下文中对任何重复讨论的需求。案例研究是一个“典型的”钢纵梁桥，重点是响应方式与有限的交通管制产生的实际并发症之间的关系。

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