迟宇,邓扬,李爱群,侯妙乐,王国利,杜明义

• 1:北京建筑大学
• 2:东南大学

摘要(Abstract)：

针对我国古代石拱桥因长期自然环境作用及人为破坏等因素出现较多结构病害,以及年代久远、缺乏设计资料等原因,急需有效的技术方法获取关键结构参数并进行结构状态评估的问题,该文提出一种基于三维点云的古石拱桥关键结构参数识别方法。以北京卢沟桥为研究对象,利用三维激光扫描的空间坐标数据建立了拱轴线的自动迭代拟合算法,在此基础上,开展了拱圈矢高、跨径和矢跨比等关键结构参数的识别与分析。结果表明,卢沟桥的拱轴线线形为圆弧线,各拱圈矢跨比均在0.37以上,均属陡拱;卢沟桥各拱圈的上、下游之间已产生相对变形,以拱5最为显著;卢沟桥顺桥向各拱圈的结构对称性已有显著改变,拱11和拱1之间的净矢高与净跨径偏差值分别为252.4 mm和380.7 mm。分析结果可为北京卢沟桥的后续保护提供依据,该文方法也可为类似石拱桥的维修保护提供技术支持。

关键词(KeyWords)： 三维点云;石拱桥;拱轴线;跨径;矢高;变形监测

Abstract:

Keywords:

基金项目(Foundation): 国家重点研发计划项目(2019YFC1520800);; 国家自然科学基金项目(51878027);; 北京市教委青年拔尖人才培育计划项目(CIT&TCD201904060);北京市教委科技项目(KM201910016013)

作者(Author): 迟宇,邓扬,李爱群,侯妙乐,王国利,杜明义

DOI: 10.16251/j.cnki.1009-2307.2021.08.010

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