摘要
城市供水、燃气、热力等地下管线分布范围广,其敷设场地环境的土体参数存在空间变异性,对管线结构地震响应产生显著影响。该文使用多元土体随机场模型生成管道周围土体参数,使用弹性地基梁模型分析地震行波作用下地下管线的响应;基于刚性接口和柔性接口铸铁管线模型,分析了土体参数相关性对接口变形和管道应变响应的影响规律。分析结果表明,管道接口张开量受相邻管道两端所连土弹簧刚度差异的影响,土体参数空间相关性的减小,导致管道上土弹簧刚度波动性增加,进而导致沿线管道接口张开量波动性的增大;土体参数空间相关模型计算得到的管线接口响应,比确定性模型响应结果增大7.9%~27.9%;柔性接口管线更易受到土体参数沿线随机性的影响。
The buried pipelines,such as water,gas and heat supply pipelines,are widely distributed in urban areas.The seismic responses of pipeline are significant affected by the spatial variability of soil properties along the pipeline.The multi-variable random field method was used to generate random soil properties along the pipeline and the elastic foundation beam model was used for seismic response analysis of pipeline under passage wave.The influence of critical soil parameter correlations on joint deformations and pipe strain was investigated for the pipelines with rigid joint and flexible joint.The numerical results show that the joint openings are significantly affected by the stiffness differences of soil springs connected to the adjacent pipes.The decrease of spatial correlation of soil parameters leads to the increase of stiffness differences of the soil springs along the pipelines,which increase the variability of joint openings along the pipelines.The pipe joint responses obtained from the model considering spatial correlation of soil properties are 7.9%~27.9%higher than the deterministic model.The flexible joint is more susceptible to the randomness of soil parameters along the pipeline.
作者
侯本伟
徐倩怡
张亚波
韩俊艳
钟紫蓝
HOU Ben-wei;XU Qian-yi;ZHANG Ya-bo;HAN Jun-yan;ZHONG Zi-lan(Key Lab of Urban Security and Disaster Engineering(Beijing University of Technology),Ministry of Education,Beijing 100124,China)
出处
《工程力学》
北大核心
2025年第5期133-144,共12页
Engineering Mechanics
基金
国家自然科学基金面上项目(51978023)
北京市教委科技计划一般项目(KM202010005031)。
关键词
随机场
埋地管线
地震响应
分段管线
不确定性分析
random field
buried pipeline
seismic response
segmented pipeline
uncertainty analysis
