FORCE methods and DISPLACEMENT methods for analysis of Indeterminate Structures

Indeterminate structures can not be analyzed using equations of equilibrium alone. Hence special methods are required to analyze these structures. There are several methods available for the analysis of indeterminate structures. All these methods can be grouped into two categories depending on the selection of primary unknowns (i.e. force and displacement).
This is the basic video to start learning THEORY OF STRUCTURES or STRUCTURAL ANALYSIS subjects. This video explains the concept of force methods and displacement methods with suitable examples and also the comparison of these methods.
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[@rukhsar2804]

This lecture was very useful for me, Thanks a lot mam❤️

[@DrSuchitaHirde_CivilEnggVideos]

Thanks for comment

[@shahadathossenshakil7635]

Thanks a lot mam. This lecture clears all of my confusions. ❤️

[@DrSuchitaHirde_CivilEnggVideos]

Good to know that.. best wishes

[@troglodyte_]

I found googling that 2nd theorem of castigliano method belongs to force method and 1st theorem of castigliano belongs to displacement method. Can you clearify on that ma'am ?

[@DrSuchitaHirde_CivilEnggVideos]

In 1st theorem we take partial derivative of total strain energy with respect to displacement which gives force
In second theorem we take partial derivative of total strain energy with respect to force which gives displacement.
As per my experience, In many books and also in many online videos this is not mentioned correctly and hence students get confused.
I hope this will help you to understand.

[@troglodyte_]

@@DrSuchitaHirde_CivilEnggVideos thankyou ma'am . As you said, yes i have also been taught wrong about this in my bachelor's . After some research i got to know the actual definition and description. My confusion is, if we have to differentiate these two theorems, does both of these fall into 'force method' ? Or they belong to different category ?
Thanks again for the response respected Ma'am . 🙏