共同沟管道隔震分析
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摘要
共同沟属于生命线地震工程基础设施的一部分,一般指设置于道路之下,可以容纳2种以上的公用设施管线的构造物。随着社会经济的发展和城镇化水平的迅速提高,我国许多大中型城市陆续开始了共同沟的建设,与共同沟相关的科学研究工作也日益得到重视,其中,共同沟体系的抗震设计理论和方法就是当今研究热点之一。本文从近代世界各国的共同沟震害特性分析入手,结合课题组已完成的试验和理论研究成果,以共同沟内部管道的抗震设计方法为研究对象,利用有限元数值模拟方法分析了多种工况条件下沟内管道的地震反应规律和多种隔振装置的减震效果,提出了适用于我国共同沟特点的沟内管道系统的隔振减震设计方法。
首先,共同沟内部的管道与一般直埋式管道在受力方式及破坏形式上有很大不同。文中列举了通常管道的破坏情况,参考了地上支座管道的隔震方法,探讨了共同沟管道在地震中的影响因素。
其次,参考建筑隔震方法设计出了一种适用于共同沟管道的隔震方法。
再次,使用有限元软件进行建模,对模型进行不同影响参数的数值模拟分析。
最后,观察模拟结果,对模拟结果数值进行分析比较,总结出不同影响参数对共同沟管道隔震的效果,并设计出一款支座隔震器。
通过数值模拟结果对比发现:适当的埋深、管周摩擦力对于共同沟管道的地震响应有降低作用;设置隔振器后,合理的刚度和阻尼的选择搭配可以有良好的隔震效果;管道隔震器的隔震效率在不同大小的地震中不同;共同沟结构四周铺设粗颗粒砂土的隔震效果良好。
Utility tunnel belongs to one aspect of the lifeline engineering, normally refers to the structure which is built underground and contains more than 2 kinds of public facility pipelines or electronic wires, so does its attached structures. Since the economic situation is moving forward, the constructions of utility tunnels are started in many cities, and researchers are paying more and more attentions to the analyses on utility tunnels. One of the hottest topics is the work on seismic design theory and method of utility tunnel. This article started with the analysis on characteristic of seismic destruction of utility tunnels in different countries, then, based on the achievements in experiment and theory in lifeline earthquake engineering researching center in Harbin Institute of Technology(LEERC-HIT), using finite simulation program to analyze the seismic response regulation of pipeline in utility tunnel and the efficiency of seismic isolator, one seismic isolator design method which is proper for utility tunnels in China is proposed.
Firstly, the way of load and destructive form are different between pipeline in utility tunnel and buried pipeline. In this article, normal damage of pipelines is listed, referring to isolation method of above-ground pipeline, effect factors to seismic response are discussed. Secondly, design one isolation method which is suitable to pipeline in utility tunnel.
Thirdly, using finite element simulation program, different factors which can influence the response of pipeline in utility tunnel are analyzed.
Lastly, comparing the results of simulation, this article concludes the efficiency of different factors, and one support seismic isolator is design.
By analyzing the results of numerical simulation, it is shown that: earthquake response could be reduced with proper burial depth and friction force around pipe; reasonable spring stiffness with damping in the seismic isolator could bring proper isolating effects; laying fine sandy soil around structure of utility tunnel has obvious isolating effect.
首先,共同沟内部的管道与一般直埋式管道在受力方式及破坏形式上有很大不同。文中列举了通常管道的破坏情况,参考了地上支座管道的隔震方法,探讨了共同沟管道在地震中的影响因素。
其次,参考建筑隔震方法设计出了一种适用于共同沟管道的隔震方法。
再次,使用有限元软件进行建模,对模型进行不同影响参数的数值模拟分析。
最后,观察模拟结果,对模拟结果数值进行分析比较,总结出不同影响参数对共同沟管道隔震的效果,并设计出一款支座隔震器。
通过数值模拟结果对比发现:适当的埋深、管周摩擦力对于共同沟管道的地震响应有降低作用;设置隔振器后,合理的刚度和阻尼的选择搭配可以有良好的隔震效果;管道隔震器的隔震效率在不同大小的地震中不同;共同沟结构四周铺设粗颗粒砂土的隔震效果良好。
Utility tunnel belongs to one aspect of the lifeline engineering, normally refers to the structure which is built underground and contains more than 2 kinds of public facility pipelines or electronic wires, so does its attached structures. Since the economic situation is moving forward, the constructions of utility tunnels are started in many cities, and researchers are paying more and more attentions to the analyses on utility tunnels. One of the hottest topics is the work on seismic design theory and method of utility tunnel. This article started with the analysis on characteristic of seismic destruction of utility tunnels in different countries, then, based on the achievements in experiment and theory in lifeline earthquake engineering researching center in Harbin Institute of Technology(LEERC-HIT), using finite simulation program to analyze the seismic response regulation of pipeline in utility tunnel and the efficiency of seismic isolator, one seismic isolator design method which is proper for utility tunnels in China is proposed.
Firstly, the way of load and destructive form are different between pipeline in utility tunnel and buried pipeline. In this article, normal damage of pipelines is listed, referring to isolation method of above-ground pipeline, effect factors to seismic response are discussed. Secondly, design one isolation method which is suitable to pipeline in utility tunnel.
Thirdly, using finite element simulation program, different factors which can influence the response of pipeline in utility tunnel are analyzed.
Lastly, comparing the results of simulation, this article concludes the efficiency of different factors, and one support seismic isolator is design.
By analyzing the results of numerical simulation, it is shown that: earthquake response could be reduced with proper burial depth and friction force around pipe; reasonable spring stiffness with damping in the seismic isolator could bring proper isolating effects; laying fine sandy soil around structure of utility tunnel has obvious isolating effect.
引文
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[25]徐志英,施善云.土与地下结构动力相互作用的大型振动台试验与计算[J].岩土工程学报,1993,15(04),1-7.
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