Finite-element-models are usually employed to simulate the behaviour of historical constructions. However, despite the high complexity of these numerical models, there are always discrepancies between the actual behaviour of the structure and the numerical predictions obtained. In order to improve their performance, an updating process can be implemented. According to this process, the value of the most relevant physical parameters of the model is adjusted to better mimic the actual behaviour of the structure. For this purpose, the actual structural behaviour is usually characterized via its experimental modal properties (natural frequencies and associated vibration modes). For practical engineering applications, the maximum likelihood method is normally considered to cope with this problem, due to its easy implementation together with an understandable interpretation of the updating results. However, the complexity of these numerical models makes unfeasible the practical implementation of the process due to the simulation time required for its computation. In order to shed some light to this problem, a new combinative computational algorithm is proposed herein. Additionally, the performance of the proposal has been assessed successfully via two applications: (i) a validation example, the model updating of a laboratory footbridge, in which the practical implementation of the algorithm has been described in detail; and (ii) a case-study, the model updating of a complex historical construction, in which the main advantage of the proposal has been highlighted, a clear reduction of the simulation time required to solve the updating problem without compromising the accuracy of the solution obtained.

中文翻译：

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通过新的组合计算算法对历史建筑的有限元模型更新进行稳健改进

有限元模型通常用于模拟历史建筑的行为。然而，尽管这些数值模型非常复杂，但结构的实际行为与获得的数值预测之间始终存在差异。为了提高其性能，可以实施更新过程。根据此过程，调整模型最相关的物理参数的值，以更好地模拟结构的实际行为。为此，实际结构行为通常通过其实验模态特性（固有频率和相关振动模式）来表征。对于实际工程应用，通常认为最大似然法可以解决这个问题，因为它易于实现并且对更新结果的解释易于理解。然而，由于计算所需的模拟时间，这些数值模型的复杂性使得该过程的实际实施变得不可行。为了阐明这个问题，本文提出了一种新的组合计算算法。此外，该提案的性能已通过两个应用程序成功评估：（i）验证示例，实验室人行天桥的模型更新，其中详细描述了算法的实际实现；(ii) 案例研究，复杂历史建筑的模型更新，其中强调了该提案的主要优点，在不影响解决方案准确性的情况下，明显减少了解决更新问题所需的模拟时间获得。