Dear all
please justify where we can use of these non linear properties of concrete in practically.
is there any use of these works, which can be address through decades .
Non linear analysis or plastic capacity of structure are aimed to assess the performance of a structure in the event of extremely adverse conditions. For example in the safety level earth quake, which are very rare events, the design aim is to avoid complete collapse of the building structure so the human life damages can be prevented.
In this case the ductility of members play an important role.
You would have heard about moment redistribution and plastic hinges. Now you take the example of a fixed ended beam by neglecting axial deformation, the degree of static indeterminacy is 2. Let assume you keep on increasing the load beyond allowable or yield point until the plastic hinges form at the two support that will turn your beam as the simply supported beam and will become a determinate structure and on further increase the load it will increase the span moment.
In short this is the situation that we utilize sure safety level eq or similar events.
Why we do so, because of cost benefit analysis. If you design the said beam for the most extreme load within elastic range then the cost may go as high as 5 times of the average cost that may turn into a non feasible design.
Hope it is clear
Thank you it is well explained...I general it is cent percent aggre with this,,, but coming to concrete non-linear fracture parameters like Gf and Cf , where it can be well suited, as like post failure investigation or can we use in any design methods.
Request share...urs ideas.
Dear Prashanth V P
Please look up these articles. you would come up with appropriate answer.
Article New methodology for calculating damage variables evolution i...
Article Concrete Damage Plasticity Model for Modeling FRP-to-Concret...
https://www.academia.edu/download/61349464/_15__Very_important20191126-70686-7obcx7.pdf
Bests,
Nima Kian
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