摘要
管道或容器的接管部位由于结构不连续存在较大的局部应力,且分析设计时不易求解,公报WRC107对此给出了一种计算方法,但用其分析接管结构的误差还不是很明确。针对支腿受轴向载荷的圆柱壳上总应力强度的求解,比较了WRC107和有限元计算的结果,研究了接管壁厚及参数β,γ对WRC107计算误差的影响。针对内压和支腿上轴向力共同作用下总应力强度的求解,采用HG20582—1998《钢质化工容器强度计算规定》(即HG法)作为WRC107的补充,研究了其计算的误差。结果显示,接管厚度超过主管厚度2倍时,空心接管可与实心附件等效。WRC107的计算误差依赖参数β,γ,且与有限元结果相比,存在低估总应力强度的情况。以HG法为补充,WRC107可用于计算内压和支腿上轴向力引起的总应力强度。
Global structure discontinuity at nozzle of pipe or vessel causes a high local stress, and the stress solution is difficult to get. Bulletin WRCI07 delivers a calculation method, but its calculation errors in nozzle design are not clear yet. For peak stress intensity calculation of cylindrical shell, with support or lifting lug under axial loading, the influences of parameters β,γ and the thickness of nozzle on errors were studied, by comparing results of WRC107 with results of finite element method （ FEM ）. For calculation of cylindrical shell under pressure, with support or lifting lug under axial loading （ pressure and mechanical loading）, WRC107 was supplemented by Chinese standard HG 20582--1998＂ Specification for Stress Calculation of Steel Chemical Vessels＂ （ HG method） , and the errors are studied. The results show that, the hollow support or lug could be equivalent to solid attachment when thickness is twice of the shell thickness. WRCI07 calculation errors depend on parameters β and γ, and may he underesti- mated. Complemented by HG method, WRC107 could be used to stress calculation of shell under pres sure and mechanical loading
出处
《压力容器》
北大核心
2011年第1期6-11,57,共7页
Pressure Vessel Technology
基金
浙江省科技厅重大科技攻关专项:浙江省天然气长输管道安全监控关键技术研究(2006C13002)
关键词
接管
局部应力
WRC107
有限元
总应力强度
内压
nozzle
local stress
WRC 107
finite element method
peak stress intensity
pressure
