Initial displacement of pipeline branch
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Analyze the main pipe and branch pipe separately. When analyzing the main pipe, the force and displacement of the branch tee are calculated. When analyzing the branch pipe, you only need to input the displacement of the tee point as the initial displacement, and treat the branch point as a fixed point with initial displacement. Should the force at this point be considered? This post was last edited by ashhsiang on 2009-2-18 11:20 ]
The problem should be simplified and not considered because the force is not large
How do you know the force on the second floor is not strong? This has nothing to do with the magnitude of the force. When analyzing the branch pipe, just input the linear displacement and angular displacement of the intersection point and treat it as a fixed point with initial displacement.
I guess the full expression of what the poster meant is: Since in the main pipe model, the displacement of the branch point is used as the input of the branch pipe model in the form of a fixed point with initial displacement. Should the force at this point in the branch pipe model be input into the main pipe model? I think if you want to completely simulate it, you should do this: should be input, and after inputting the force at this point of the branch pipe model into the main pipe model, it may affect the displacement of this point of the main pipe model. ； Therefore, we should continue to adjust the displacement in the branch pipe model, which also affects the stress at that point in the branch pipe model. ； Repeat the above steps infinitely until a steady state is finally reached. The calculation results at this time are the most accurate. End of joke, in reality we definitely can't do this. We have to simplify complex problems. Originally, it was divided into two models just to make it simpler. In practice our * This is the custom: Establish a hypothesis: When the diameter of the main pipe is much larger (more than 2 times) than the diameter of the branch pipe, the force exerted by the branch pipe on the main pipe can be ignored, so: When the diameter of the main pipe is greater than twice the diameter of the branch pipe, it can be calculated separately and processed as mentioned on the 2nd and 3rd floors. When the diameter of the main pipe is not greater than twice the diameter of the main pipe, they must be combined in one model for calculation. (Of course, you can also split it if you don’t mind adjusting between the 2 models unlimited times)