Evaluation of the response of a vaulted masonry structure to differential settlements using point cloud data and limit analyses
Evaluation of the response of a vaulted masonry structure to differential settlements using point cloud data and limit analyses
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DOI：
10.1016/j.conbuildmat.2017.05.075
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发表时间：
2017-09-30
影响因子：
7.4
通讯作者：
Woodhams, Jim
中科院分区：
文献类型：
--
作者：
Acikgoz, Sinan;Soga, Kenichi;Woodhams, Jim
不均匀沉降对砌体结构的使用性能和稳定性有不利影响。然而，现有的监测和评估技术并没有足够详细地反映这些影响。本文提出了一种新的方法，以更好地描述支持运动对筒形拱顶的影响。在这种方法中，激光扫描点云的解决拱形结构进行了比较。采用不同的云比较方法，准确识别小的点云段的位移。特别是，一个新的云比较方法，它修改了著名的迭代最近点（ICP）配准算法，开发。通过约束ICP以保证相邻点云段之间的位移连续性，获得结构的三维运动估计。这些估计通过指出裂缝的位置和程度来描述沉降响应。然后，利用这些丰富的信息，通过极限状态数值分析来识别拱顶的沉降响应机制。最后，通过对计算结果的解释，提出了一种新的方法来量化筒拱砌体结构的沉降影响。这种损坏评估技术用于评估由于打桩引起的伦敦桥站砖石高架桥沉降而观察到的损坏。(C)2017作者爱思唯尔有限公司出版
Differential settlements have adverse effects on the serviceability and stability of vaulted masonry structures. However, the existing monitoring and assessment techniques do not capture these effects in sufficient detail. In this paper, a new approach is proposed to better describe the influence of support movements on barrel vaults. In this approach, laser scan point clouds of a settling vaulted structure are compared. Different cloud comparison methods are used to accurately identify the displacements of small point cloud segments. In particular, a new cloud comparison method, which modifies the well-known iterative closest point (ICP) registration algorithm, is developed. By constraining ICP to ensure displacement continuity between adjoining point cloud segments, three dimensional movement estimates of the structure are obtained. These estimates delineate the settlement response by indicating the location and magnitude of cracking. This rich information is then used to identify the settlement response mechanism of the vault using limit state numerical analysis. Finally, by interpreting the numerical results with relevant serviceability criteria, a new method to quantify the influence of settlements on barrel vaulted masonry structures is proposed. This damage assessment technique is used to evaluate observed damage due to piling-induced settlements in a masonry viaduct at London Bridge Station. (C) 2017 The Authors. Published by Elsevier Ltd.