【作者】 胡晓娜；

【导师】 钟铁毅；

【作者基本信息】 北京交通大学 ， 防灾减灾及防护工程， 2007， 硕士

【摘要】 生命线工程是维系现代城市与区域经济、社会功能的基础性工程设施与系统,其典型对象包括区域电力与交通系统、城市供排水、供气系统、通讯系统等。随着城市现代化程度的快速提高、规模的不断扩大,城市对生命线工程系统的依赖就越来越强。近年来,随着地下管道数量的增多和震害的频繁出现,人们开始认识到地下管线抗震研究的必要性和迫切性;同时,地下管线与地上结构在地震作用下的震动特性有很大的不同,因而地下管线的抗震又有其独有的特点。在本文中,首先分析了埋地管线的震害特征。根据震害资料,归纳总结了埋地管线的各种破坏模式和影响破坏的主要因素。利用大型通用有限元分析软件ANSYS建立了埋地管线的有限元模型,首先进行了管线在土压力、水压力等永久荷载作用下的静力分析,得出了管线的位移和应力值特点,其次简单比较了不同级别的车辆荷载对管道结构内力的影响;接下来进行了管线的模态分析,得出了结构的自振频率和周期,总结了管道的振型特点;并进一步地对单向地震波激励下管线的响应进行了计算和分析,本文针对三类场地三种地震烈度,共输入了15条地震波进行计算,通过大量数据的比较,从中得出了不同烈度不同场地的响应规律性:1.随着地震烈度的增大,管线的地震响应加剧,并且地震烈度对管线的影响是显著的。2.场地条件不同,管线的响应是不相同的,场地条件对管线的影响有时候甚至会超过地震烈度对管线的影响。3.本文对普通钢筋混凝土管道在地震作用下的抗震性能研究结果表明,Ⅰ类场地9度下就会发生拉裂破坏,应引起高度重视。本文计算得出的数据和结论,为埋地管线的抗震设计提供了一定的依据。更多还原

【Abstract】 Lifeline engineering is the basic facilities and system which is dispensable to human daily life and cities’ economy functions. The lifeline engineering including region electric power and communication systems, water and gas transmission networks, news report system and so on. And these are essential for sustaining the life of community after a catastrophic event such as a destructive earthquake. With the increasing of underground pipelines and frequent earthquake damage, the importance and necessity of the seismic analyze for underground pipeline has been recognized in recent years. Furthermore, the vibration characteristics of underground pipelines are different from those of overground structures, so that the seismic analyze for underground pipelines has particular characteristics.The paper first analyzes the earthquake disasters of underground pipelines. According to earthquake information, the paper generalized the damage characteristic and effect factors of the underground pipeline.Then, finite element model of the underground pipeline is built by ANSYS finite element analysis program, firstly, the paper obtains the displacement and stress value of the structure by the static analysis, the static load include soil pressure, water pressure and etc.. Secondly, the paper compares the effect of different vehicular load on internal force of the pipeline structure. Next, by the modal analysis of the pipeline, the paper gets the natural frequency and cycle, calculates and analyzes the response of pipelines on the one-way seismic wave excitation.The paper studies the impacts of three types sites and seismic intensity, 15 earthquake wave are inputed totally, summarizes the response pattern of the different sites and intensity by comparing the calculation results:1. With the increasing of the earthquake intensity, the seismic response of the pipeline is intensified, and the intensity of earthquakes on the pipeline is significant.2. Under different site conditions, response of the pipeline is different, and sometimes the site conditions have more impact on the pipeline than seismic intensity.3. The seismic performance of common reinforced concrete pipeline in the essay under the seismic loading is not very good. When the structure located in I site condition 9 seismic intensity, it will be tension cracked,so the seismic capacity of the pipeline should be improved. The calculated data and conclusions in this paper can provide some references for the seismic design of the buried pipeline.更多还原