直埋热水供热管道三通热-力耦合分析  

Analysis on the T-joint thermal coupling for directly buried heating pipeline

作　　者：江超[1] 官燕玲[1] 邓顺熙[1] 王军 JIANG Chao;GUAN Yanling;DENG Shunxi;WANG Jun(School of Environmental Science and Engineering, Chang′an University, Xi′an 710054,China;Parent Company of Xi′an District Heating, Xi′an 710016,China)

机构地区：[1]长安大学环境科学与工程学院,陕西西安710054 [2]西安市热力总公司,陕西西安710016

出　　处：《西安建筑科技大学学报（自然科学版）》2016年第4期585-592,共8页Journal of Xi'an University of Architecture & Technology(Natural Science Edition)

基　　金：国家青年科学基金项目(51208059);陕西省科学技术研究发展计划基金资助项目(2013K13-02-01);陕西省住房和城乡建设厅科学技术计划基金资助项目(2014-04)

摘　　要：针对直埋热水供热管道三通受力的复杂性,基于土弹簧模型建立了热-力耦合有限元模型,分析了直埋三通应力的主要影响因素,并给出了简化三通接管长度的热-力耦合有限元模型.建模中管土相互作用考虑了介质本身的重量和覆土重力等的作用,三通管段的边界条件施加在主管和支管端头.结果表明,直埋三通在温升作用下,相贯区峰值应力较大;直埋三通的二次应力随温升、管道壁厚、支管管径、主管过渡段长度变化,而受内压影响较小;地面荷载作用使三通最大当量应力减小,对三通起保护作用.该结果旨在为直埋管道的安全性提供帮助.To study the complicated stress characteristics of T- joints in directly buried heating pipelines, a thermal-mechanicalcoupled finite element model was constructed using the soil spring model. The main affecting factors on stress distribution of directlyburied T- joints were analyzed. A thermal-mechanical coupled finite element model for T- joints with reduced straight pipe lengthswas given. The weights of thermal medium and covering soil were considered in the pipe-soil interaction of the model. The boundaryconditions were applied to the ends of the main pipes and the branch. The results indicate that the junction area of buried T- jointsbears peak stress with high value due to temperature rise. The secondary stress varies with temperature rise, pipe wall thickness,branch diameter and the length of partly restrained section. The internal pressure has little effect on the secondary stress of T- joints.The ground load, which decreases the maximum equivalent stress of buried tee joint, is benefit to the buried pipelines. The findingsof this article aim to provide aid for security analysis on buried pipelines.

关 键 词：直埋供热管道 三通 热-力耦合 有限元分析 

分 类 号：TU995[建筑科学—供热、供燃气、通风及空调工程]