供热直埋热水管道弯管的整体与局部应力分析
Integral and Local Stress Analysis of Bend Pipe in Direct Buried Hot Water Heating Pipelines

DOI: 10.12677/HJCE.2019.88150, PP. 1293-1301

Keywords: 直埋供热管道，弯管，全尺寸模型，数值模拟
Direct Buried Hot Water Heating Pipelines, Bend Pipe, Full-Scale Model, Numerical Simulation

Full-Text   Cite this paper   Add to My Lib

Abstract:

城镇供热直埋热水管道局部元件如弯头和三通等受力复杂，采用ANSYS进行建模可以得到详细的应力状态分析。大型管道系统线路长，架空管道和埋地管道混合在一起，建立全尺寸的ANSYS模型不具有可操作性。START管道应力分析软件采用一维梁模型经典管道应力分析模型理论，在大型管道系统长管段模拟上优势明显。为验证其可靠性，本文对比了START软件与ANSYS软件对供热直埋热水管道弯头应力分析的结果，分析了弯头一次以及二次应力随管道内压、埋深、壁厚、曲率半径、转角的变化规律。对比结果表明，START软件在直埋热管管道弯头应力分析上可以得到与ANSYS一致的结果，并且建模方便、计算迅速，可为直埋供热管道弯头的整体与局部应力分析提供帮助。
Local components of the directly buried hot-water heating pipelines, such as bends and tee joints, bear complex stress which can be obtained by detailed stress state analysis using ANSYS simulation. However, it is not operable to establish detailed full-scale ANSYS models for large-scale piping systems which combine long overhead pipelines and buried pipelines. START Pipe Stress Analysis Software, which is based on one-dimensional beam model for classical pipe stress analysis, has obvious advantages for pipe stress analysis on large-scale piping systems with long pipelines. To verify the feasibility of START model, we conducted stress analysis of bend pipe indirectly buried hot-water heating pipeline by using START model and ANSYS model, respectively. The influences of the internal pressure, buried depth, pipe wall thickness, radius of curvature and angle of the bend on the primary stress and the secondary stress of the elbow were analyzed. The simulation results show that the START model obtains consistent results with the ANSYS model in the stress analysis of bend pipes. The START model, which is characterized by convenience for modeling and high computational efficiency, can provide help for integral and local stress analysis of bend pipe in direct buried hot water heating pipelines.

References

[1]	中国建筑节能协会能耗统计专委会. 中国建筑能耗研究报告[R]. 上海: 中国建筑节能协会能耗统计专委会, 2018.
[2]	李奎, 王飞, 王国伟, 等. 直埋压制三通疲劳极限合理性对比分析[J]. 太原理工大学学报, 2017, 48(2): 174-178+183.
[3]	李明强, 王飞, 王国伟, 等. 小结构Z形弯管在大管径供热直埋管道中的应用研究[J]. 暖通空调, 2015, 45(5): 71-74.
[4]	梁鹂. 短补偿臂“Z”形供热直埋弯管的应力分析[J]. 太原科技大学学报, 2016, 37(4): 332-336.
[5]	姚红, 王飞, 王国伟, 等. 几种供热直埋Z形补偿弯管补偿能力的数值分析[J]. 暖通空调, 2017, 47(8): 128-131.
[6]	李海冬, 梁鹂. 基于混合模型的供热直埋弯头应力有限元分析[J]. 建筑热能通风空调, 2017, 36(10): 71-74.
[7]	平飞, 王飞, 王国伟, 等. 95？~135？不规则Z形弯管应力变化规律[J]. 华侨大学学报(自然科学版), 2017, 38(5): 664-669.
[8]	刘桢彬, 王飞, 王国伟, 等. 直埋供热管道“L”形管段的受力分析[J]. 太原理工大学学报, 2013, 44(1): 85-88.
[9]	江超, 官燕玲, 邓顺熙, 等. 直埋供热管道直角弯管热-力耦合分析[J]. 西安交通大学学报, 2016, 50(5): 125-133.
[10]	Xu, Q., Feng, J.X. and Zhang, S.C. (2017) Influence of End Side Displacement Load on Stress and Deformation of “L”-Type Large-Diameter Buried Pipe Network. Applied Thermal Engineering, 126, 245-254. https://doi.org/10.1016/j.applthermaleng.2017.07.185
[11]	Xu, Q., Feng, J.X. and Zhang, S.C. (2017) Combined Effects of Different Temperature and Pressure Loads on the “L”-Type Large-Diameter Buried Pipeline. International Journal of Heat and Mass Transfer, 111, 953-961. https://doi.org/10.1016/j.ijheatmasstransfer.2017.04.067
[12]	北京市艾思弗计算机软件技术有限责任公司. Start-Prof 4.83.
[13]	中华人民共和国住房和城乡建设部. CJJ/T 81-2013城镇供热直埋热水管道技术规程[S]. 北京: 中国建筑工业出版社, 2013.
[14]	王来, 高鹏翔, 刘滨, 等. 农田向农林复合系统转变过程中土壤物理性质的变化[J]. 应用生态学报, 2017, 28(1): 96-104.
[15]	江超. 多层结构直埋热水供热管道应力原位实验及热-力耦合有限元分析[D]: [博士学位论文]. 西安: 长安大学, 2015.

Full-Text