摘要
折角是直埋供热管道的一个设计难点,两直管段直接对焊可导致热力钢管出现局部应力集中。利用揻弯连接两直管的方法可减小钢管的最大应力,但这种连接的应力分布特征有待揭示。根据实际工程,建立管-土接触作用下的揻弯管段有限元模型,对工作钢管应力以及周围土体温度场的特征进行了分析,并研究了工作温度及管压对钢管Tresca应力的影响。结果表明,钢管凹侧的当量应力大于凸侧,在弯头/直臂衔接处应力值最大;随管压和工作温度的增加,钢管当量应力逐渐增大,钢管的当量应力处于安全应力范围内。建议工程设计中重点关注弯头/直臂衔接的钢管凹侧位置。
Turning point was one of the difficulties in the design of directly buried heating pipeline because direct welding of the two straight pipe sections will lead to local stress concentration in the thermal steel pipe.The method of connecting two straight pipes by bending can reduce maximum stress of the steel pipe,but the stress distribution characteristics of this connection need to be revealed.According to an engineering project,a bent pipe section was modeled by the finite element method.The stress of working steel pipe and surrounding soil temperature field were analyzed,and effect of working temperature and pipe pressure on the Tresca stress of steel pipe was discussed.The results showed that stress equivalent of the concave side of steel pipe was larger than that of the convex side,and stress value was the largest at the connection of the bend/straight arm;with the increase of pipe pressure and working temperature,the equivalent stress of the steel pipe increased gradually,and overall stress level of steel pipe is within safe stress level.It was recommended to pay more attention to the concave side of the bend/straight arm connection in future engineering practice.
作者
许国春
刘松涛
焦祥冬
朱翘楚
高红帅
王福彤
XU Guo-Chun;LIU Song-Tao;JIAO Xiang-Dong;ZHU Qiao-Chu;GAO Hong-Shuai;WANG Fu-Tong(First Design and Research Institute,North China Municipal Engineering Design and Research Institute,Tianjin 300381,China;Heilongjiang University School of Hydraulic and Electric Power,Harbin 150080,China;Heilongjiang University School of Civil Engineering,Harbin 150080,China;Changzhi Urban Heat Company,Changzhi 046000,Shanxi,China)
出处
《黑龙江大学工程学报》
2023年第1期69-75,共7页
Journal of Engineering of Heilongjiang University
基金
黑龙江省重点研发计划项目(GZ20220083,GY2023ZB0022)
国家自然科学基金项目(51678221)。
关键词
弯管
直埋供热管
管-土接触
有限元
Tresca应力
bending
directly buried heating pipe
pipe-soil interaction
finite element
Tresca Stress
