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# Re: Which method do you like for calculating deflection

• To: seaint-seaosc(--nospam--at)mail-list.com
• Subject: Re: Which method do you like for calculating deflection
• From: "Gary L. Hodgson and Assoc." <design(--nospam--at)hodgsoneng.ca>
• Date: Thu, 14 Mar 2013 07:48:05 -0400
• List-subscribe: <mailto:SEAINT-SEAOSC-on@mail-list.com>

```Listers,
```
I have been struggling with this problem for a while, not so much for deflection but for bending moment. The methods I use are the Three Moment theorem and the Method of super-position. These give different answers and when I check them by FEM computer program I get another different answer.
```Gary

On 2013/03/11 6:21 PM, TJ Fu wrote:
```
```Yes, it is the Conjugate Beam Method.

1.     For example: 100' - 150' - 200' spans

```
2. The moments: 1st interior = 500'k and 2nd interior support = 1000'k 3. Span 1 (100') Deflection due to 500'k moment
```
·         Convert span into a Conjugate Beam

·         Simple support still simple support (our case)

·         Fixed end becomes free end

·         Free end become fixed end

·         Apply M/EI diagram on span --> a triangular load with M/EI at
right support and 0'k at left support, M=500'k

·         Consider span 1 as the Conjugate Beam, the total fictious load
```
```
Truncated 1260 characters in the previous message to save energy.

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