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首页> 外文期刊>Earthquake Engineering & Structural Dynamics >Evaluation of force-based and displacement-based out-of-plane seismic assessment methods for unreinforced masonry walls through refined model simulations
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Evaluation of force-based and displacement-based out-of-plane seismic assessment methods for unreinforced masonry walls through refined model simulations

机译：通过改进的模型仿真评估未受力砌体墙的基于力和基于位移的面外地震评估方法

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摘要

The performance of force-based and displacement-based seismic assessment methods for the life-safety limit state check of out-of-plane loaded unreinforced masonry walls is evaluated on the basis of refined numerical simulations. For this purpose, a discrete element model of a vertically spanning wall is built and validated against experimental results from static and dynamic test conditions. The model is then analysed for a large range of wall configurations. For each configuration, a static pushover analysis and a series of incremental dynamic analyses are run, the latter permitting to determine the capacity of the wall under dynamic loading. The accuracy of the assessment methods in predicting the acceleration at which the walls collapse is evaluated. It is found that the displacement-based method is more accurate, robust, and safe than the force-based method. The comparison also shows that for walls characterised by a relatively high ratio of axial load to Euler's critical load, both assessment methods lead to an overestimation of the wall capacity. As a remedy, a modification to the methods based on a recently developed mechanical model is put forward and tested. For the force-based method, it is additionally suggested to set for walls with relatively high overburden ratios the behaviour factor equal to 1. To ensure reproducibility of this study, all input and output files of the numerical simulations are made publicly available.
机译：在改进的数值模拟的基础上，评估了基于力和基于位移的地震评估方法对平面外无筋砌筑墙的生命安全极限状态检查的性能。为此，建立了垂直跨墙的离散单元模型，并针对静态和动态测试条件下的实验结果进行了验证。然后分析模型的各种墙面配置。对于每种配置，都将进行静态推覆分析和一系列增量动态分析，后者可以确定墙在动态载荷下的承载能力。评估评估方法在预测壁坍塌加速度时的准确性。发现基于位移的方法比基于力的方法更准确，鲁棒和安全。比较还表明，对于以轴向载荷与欧拉临界载荷之比较高的特征为特征的墙，两种评估方法都会导致对墙体承载力的高估。作为补救措施，提出并测试了基于最近开发的机械模型的方法。对于基于力的方法，还建议为覆盖率相对较高的墙设置行为因子等于1。为确保本研究的可重复性，数值模拟的所有输入和输出文件均公开提供。

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