h**e
发帖数: 410 | 1 我遇到这么一个问题， 假设铁质管道（大约长4-5米), 分三层堆放，每上下层管道之
间用两个木方（4英寸X3 英寸）垫底，同层木方之间距离待定，卡车长途运输， 管道
在运输过程中会发生颤振，针对这种现象，要求用解析解或简化方程求出管道的最大应
力。
请教达人，欢迎讨论，谢谢！ |
a*******r
发帖数: 344 | 2 My guess is as long as the frequecy of your expected exitation force (for
example truck running over a series of speed bumps) is far away from the
pipe's resonant frequency (and it is very likely so), your pipes are going to
be fine in terms of dynamic forces.
Worst case of scenario, your truck hit on speed bump at high speed, the
force transfered from timber block to pipe will be a pulse excitation. If
this is true, a dynamic amplification factor of 2 should be ok.
Buckling of pipe wall under impusle force is another story...
Which I'd rather use as many soft timber blocks as I can to avoid instead fo running an "analysis".
just my 2 cents. I could be wrong.
【在 h**e 的大作中提到】
: 我遇到这么一个问题， 假设铁质管道（大约长4-5米), 分三层堆放，每上下层管道之
: 间用两个木方（4英寸X3 英寸）垫底，同层木方之间距离待定，卡车长途运输， 管道
: 在运输过程中会发生颤振，针对这种现象，要求用解析解或简化方程求出管道的最大应
: 力。
: 请教达人，欢迎讨论，谢谢！
|
h**e
发帖数: 410 | 3 我遇到这么一个问题， 假设铁质管道（大约长4-5米), 分三层堆放，每上下层管道之
间用两个木方（4英寸X3 英寸）垫底，同层木方之间距离待定，卡车长途运输， 管道
在运输过程中会发生颤振，针对这种现象，要求用解析解或简化方程求出管道的最大应
力。
请教达人，欢迎讨论，谢谢！ |
a*******r
发帖数: 344 | 4 My guess is as long as the frequecy of your expected exitation force (for
example truck running over a series of speed bumps) is far away from the
pipe's resonant frequency (and it is very likely so), your pipes are going to
be fine in terms of dynamic forces.
Worst case of scenario, your truck hit on speed bump at high speed, the
force transfered from timber block to pipe will be a pulse excitation. If
this is true, a dynamic amplification factor of 2 should be ok.
Buckling of pipe wall under impusle force is another story...
Which I'd rather use as many soft timber blocks as I can to avoid instead fo running an "analysis".
just my 2 cents. I could be wrong.
【在 h**e 的大作中提到】
: 我遇到这么一个问题， 假设铁质管道（大约长4-5米), 分三层堆放，每上下层管道之
: 间用两个木方（4英寸X3 英寸）垫底，同层木方之间距离待定，卡车长途运输， 管道
: 在运输过程中会发生颤振，针对这种现象，要求用解析解或简化方程求出管道的最大应
: 力。
: 请教达人，欢迎讨论，谢谢！
|
h**e
发帖数: 410 | 5 Thanks for your comments, very helpful.
One more question to bother, Per AASHTO code, vehicle dynamic amplification
factor IM = 1.33, which code you cited here to get factor as of 2?
to
fo running an "analysis".
【在 a*******r 的大作中提到】
: My guess is as long as the frequecy of your expected exitation force (for
: example truck running over a series of speed bumps) is far away from the
: pipe's resonant frequency (and it is very likely so), your pipes are going to
: be fine in terms of dynamic forces.
: Worst case of scenario, your truck hit on speed bump at high speed, the
: force transfered from timber block to pipe will be a pulse excitation. If
: this is true, a dynamic amplification factor of 2 should be ok.
: Buckling of pipe wall under impusle force is another story...
: Which I'd rather use as many soft timber blocks as I can to avoid instead fo running an "analysis".
: just my 2 cents. I could be wrong.
|
f**c
发帖数: 629 | 6 check out AREMA manual or Hays railraod engineering book
For railraod track analysis, there is a equation for computing dynamic
impact factor, which is a function of the train speed. I remember it can go
up to 2.
amplification
【在 h**e 的大作中提到】
: Thanks for your comments, very helpful.
: One more question to bother, Per AASHTO code, vehicle dynamic amplification
: factor IM = 1.33, which code you cited here to get factor as of 2?
:
: to
: fo running an "analysis".
|
a*******r
发帖数: 344 | 7 2 is the upper bound of dynamic response to static response of a step
function.
I just want to be conservative.
amplification
【在 h**e 的大作中提到】
: Thanks for your comments, very helpful.
: One more question to bother, Per AASHTO code, vehicle dynamic amplification
: factor IM = 1.33, which code you cited here to get factor as of 2?
:
: to
: fo running an "analysis".
|
z******i
发帖数: 5114 | 8 我们设计的时候用的更大，4还是5，我忘了，cover紧急刹车情况下 |
y******r
发帖数: 2986 | 9 我们公司考虑到野蛮施工的问题，设计系数采用5-8 |
Z****g
发帖数: 13731 | 10 我们公司考虑施工事故的问题，设计系数用8-13
kiding
【在 y******r 的大作中提到】
: 我们公司考虑到野蛮施工的问题，设计系数采用5-8
|
s********g
发帖数: 889 | 11 找到工作啦！恭喜！
【在 y******r 的大作中提到】
: 我们公司考虑到野蛮施工的问题，设计系数采用5-8
|
