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New insights from the Ölfus case study concerning the seismic performance of buried concrete wastewater pipes in the vicinity of a severe earthquake
Bulletin of Earthquake Engineering ( IF 4.6 ) Pub Date : 2020-04-05 , DOI: 10.1007/s10518-020-00825-z
A. Sigfúsdóttir

The correlation of earthquake damage to underground wastewater (sewage and drainage) pipelines and measured intensity measurements is described in this paper. The study is based on pipelines consisting primarily of segmented concrete pipes in Hveragerði, Iceland. This town experienced a Mw 6.3 earthquake on 29 May 2008, originated in its near field. Subsequently, the interior conditions of all the pipelines were thoroughly investigated by a robot camera. All the pipeline damage detected was analysed and documented. While damage in segmented pipelines is assumed to occur primarily at the joints due to axial ground strains, the predominant damage in Hveragerði was circular cracks at the centre zone of the pipe barrels. This suggests that (1) ground curvature plays a greater role in the seismic response of the pipelines, and (2) the stiffness and strength of the pipe barrel should be considered in a seismic analysis. The pipe damage observed in the sewage lines, close to the engineering bedrock, was half as much as the damage observed in the drainage lines resting on a thicker backfill material. A relationship between non-minor damage rates and the intensity measurements was observed for the drainage pipeline only, where the best overall correlation results were obtained for peak ground velocity. The commonly used fragility curves greatly underestimate the damage rate observed in the study area. This may apply to the potable water systems, where the majority of segmented pipelines consist of brittle pipes of cast iron, asbestos or concrete (HAZUS, NIBS 2003).

中文翻译:

Ölfus案例研究的新见解,涉及大地震附近地下混凝土废水管道的抗震性能

本文描述了地震对地下废水(污水和排水)管道的损害与测得的强度测量值之间的关系。该研究基于冰岛Hveragerði的主要由分段混凝土管道组成的管道。该镇在2008年5月29日发生了6.3兆瓦地震,其发源于附近地区。随后,通过机器人摄像机彻底检查了所有管道的内部状况。对检测到的所有管道损坏进行分析和记录。尽管假定分段管道中的损坏主要是由于轴向地面应变引起的,但在Hveragerði中主要损坏是在管筒中心区域的圆形裂纹。这表明(1)地面曲率在管道的地震响应中起着更大的作用,(2)在地震分析中应考虑管筒的刚度和强度。在靠近工程基岩的排污管线中观察到的管道损坏是在较厚的回填材料上排泄管线中观察到的管道损坏的一半。仅在排水管道中观察到了非轻微损伤率与强度测量值之间的关系,其中对于峰值地面速度获得了最佳的整体相关性结果。常用的脆性曲线大大低估了研究区域内观察到的破坏率。这可能适用于饮用水系统,在该系统中,大部分分段管线由铸铁,石棉或混凝土的脆性管组成(HAZUS,NIBS 2003)。在靠近工程基岩的排污管线中观察到的管道损坏是在较厚的回填材料上排泄管线中观察到的管道损坏的一半。仅在排水管道中观察到了非轻微损伤率与强度测量值之间的关系,其中对于峰值地面速度获得了最佳的整体相关性结果。常用的脆性曲线大大低估了研究区域内观察到的破坏率。这可能适用于饮用水系统,在该系统中,大部分分段管道由铸铁,石棉或混凝土的脆性管道组成(HAZUS,NIBS,2003年)。在靠近工程基岩的排污管线中观察到的管道损坏是在较厚的回填材料上排泄管线中观察到的管道损坏的一半。仅在排水管道中观察到了非轻微损伤率与强度测量值之间的关系,其中对于峰值地面速度获得了最佳的整体相关性结果。常用的脆性曲线大大低估了研究区域内观察到的破坏率。这可能适用于饮用水系统,在该系统中,大部分分段管线由铸铁,石棉或混凝土的脆性管组成(HAZUS,NIBS 2003)。仅在排水管道中观察到了非轻微损伤率与强度测量值之间的关系,其中对于峰值地面速度获得了最佳的整体相关性结果。常用的脆性曲线大大低估了研究区域内观察到的破坏率。这可能适用于饮用水系统,在该系统中,大部分分段管线由铸铁,石棉或混凝土的脆性管组成(HAZUS,NIBS 2003)。仅在排水管道中观察到了非轻微损伤率与强度测量值之间的关系,其中对于峰值地面速度获得了最佳的整体相关性结果。常用的脆性曲线大大低估了研究区域内观察到的破坏率。这可能适用于饮用水系统,在该系统中,大部分分段管线由铸铁,石棉或混凝土的脆性管组成(HAZUS,NIBS 2003)。
更新日期:2020-04-05
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