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Re: Which method do you like for calculating deflection

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On Mar 11, 2013, at 10:44 AM, "Lloyd Pack" <lloyd(--nospam--at)advantage-engineers.com> 
wrote:

> Hello List,
> 
> I'm wondering which method is your preference for calculating deflections
> on two or more continuous unequal spans.  We have equations for equal
> spans but not for unequal spans.
> 
> On two span continuous beams, I've used superposition to calculate the
> middle reaction then summation of moments about the left reaction to
> get the right reaction.  Then I use summation of vertical forces to get 
> the left reaction, followed by calculating the shears at each side of the
> reactions, then the moments from the area of the shear diagrams.  I 
> usually then use the moments and back calculate a uniform load and then 
> use that uniform load in the deflection equation for a simple span beam.
> 
> I'm not loving this method.  I've been wondering about using a 
> moment-area method or an M/EI approach.  If any of you use either of 
> these I would really like to hear your approach.  If any of you use 
> something else, will you tell me what you like and why?  I would like a 
> more elegant and hopefully more precise method.
> 

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