CAESAR II 管道应力分析培训.ppt

* Basic Stress Theory CAESAR II Implementation 其他话题Other Important Topics CNODE应用案例 … CII约束信息的辅助状态栏 If we specify a node number in the CNODE field, we have defined a CNODE connection. Here we specify two restraints. With the CNODE field specified, the restraint is not to a fixed point in space, but rather to the CNODE. * Basic Stress Theory CAESAR II Implementation 其他话题Other Important Topics Connecting Nodes - CNODES 膨胀节The CAESAR II expansion joint modeler automatically sets up CNODEs for tie-bars. 柔性管口The nozzle auxiliaries (WRC-297, API-650, BS-5500) also automatically set up CNODEs for the nozzle / shell connection. 其他Manual definition of CNODEs is then reduced to special connection types: 管道支撑在结构上pipe on steel 弹簧吊杆hanger rods 夹套管道jacketed piping * Basic Stress Theory CAESAR II Implementation 总结Summary Basic stresses reviewed　基本应力 Failure theories reviewed　失效理论 SIFs introduced　应力增强系数 Load case types introduced　工况的引人 Expansion case explained　二次应力的解释 Occasional load case set up covered　偶然工况的建立 Code equations summarized　规范的概述 Basic FE operations discussed　基本有限元的讨论 CNODEs introduced　关联节点的介绍 * * * Basic Stress Theory CAESAR II Implementation Load Cases for Code Compliance 膨胀工况的解释Expansion Case Explained However, these element forces are also pseudo forces, i.e the difference in forces between two positions of the pipe.力的大小是两个工况力的差值 Similarly, the stresses computed are not real stresses, but stress differences.应力不是真实应力，是应力的差值 This is exactly what the code wants, the stress difference, which was computed from a displacement range.二次应力是位移变化量导致的 As to whether or not this stress difference is the extreme, well that depends on the job. * Basic Stress Theory CAESAR II Implementation Load Cases for Code Compliance 膨胀工况的解释Expansion Case Explained DS1-DS2 和 T1“一样吗？. 有可能. 如果是线性系统，答案是一样的。 如果是非线性系统 (如你有 +Ys, or gaps, or friction), 答案是不一样的。 原因是两个工况应用[K] {x} = {f}。 The reason for this can be found by examining the equation [K] {x} = {f} for the two different methods. *