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New member on rigid ground or existing member

thread507-447180

New member on rigid ground or existing member

New member on rigid ground or existing member

(OP)
Hi Good Day



Firstly I have never done non-suspended slab/beam design before. As shown in sketch above if I have a member with load carrying capacity a that is resting on rigid ground or existing member with load carry capacity b without composite action at the interface (i.e. no friction no interface shear strength at the interface), can I say that my total load capacity is a+b? shall I distribute the load according to their member flexural stiffness (i.e if they have same stiffness, each member both existing and new carries the same amount of load?

Thanks

RE: New member on rigid ground or existing member

Two part answer. Your load will be distributed in the ratio of the stiffness of the two members.
However, when it comes to capacity, the full load carrying capacity of one member may not be utilised unless the weaker member yields.

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