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I have tried using rayleigh... but the matrix in position c(3,3) is not equal to -c(2,3): From chopra

I have building and forces properties: But those are not relevant... I have no displacement / acceleration. Can I use c=2*zeta*m*wn ? I want to use central difference method as in biggs book (1964)

I want to calculate "c". I have m and k. Assuming damping ratio 5%, What method to use? What are the equations? Can u show me the calculation?

Ok, i assume 5% damping ratio. What next?

Hi, In mdof I have those matrices: I have m and k, how do I find c? [ponder]https://files.engineering.com/getfile.aspx?folder=61fcd909-4fee-4484-bce9-984f705fc847&file=IMG_20210812_195135.jpg

Yes, I have tried. That is why I wrote this post, because I couldn't see it

Axial loads? Did u mean transverse loads? I think I asked a simple question [surprise] If this is the explanation for cantilever beam with point load at the end, so im fine and understood.

Mathematically speaking, I understand. But physically speaking, I cant see why it is right

Why for a cantilever (fixed-free beam) with a point load at the end, the cross section rotations are equivalent between a Timoshenko and Euler Bernoulli Beam?

Im designing. Damping ratio for reinforced concrete is 5% (Chopra). But i ask if there is any way to determine c coefficient other than Modal Analysis. And I can assume a value, but there is a calculation for it for MDOF system?

It is a reinforced concrete building, but it isnt matter,what is the formula? For SDOF, Is: But how do I find c for each floor in MDOF?

Hi, For damped MDOF system, how do I find damping coefficient "c" without using Modal Analysis? I have m and k matrices. https://files.engineering.com/getfile.aspx?folder=ac4f33fc-a894-4671-ae50-d63b961611c0&file=IMG_20210723_091249.jpg

Hi, I want to solve MDOF with damping using Biggs book: Biggs, J. (1964). Introduction to structural dynamics [by] John M. Biggs. McGraw-Hill, New York. The book's example is undamped and the resistance is equal to the minimum of 4*m/h or k*y. But i try to figure out how to solve it and what...

I know. I want to verify with single element model. I searched in the verification guide but i didnt find. Isnt matter to me which element type, only to see concrete's behavior

May you help me? Tell me what section I need? I need a reinforced concrete slab with CDP

Hi How can I model single element model to check my material properties? *What boundary conditions and load I need to assign? *There is a video but is in chinese... https://youtu.be/PO_pI3Jo-rA

But there is a difference with blast range (if the explosion is in 5m or 20m) So how do I know how to calibrate my model?

Hi, Before my study , I verified experiment of concrete slab subjected to blast with an article. I am using CDP and Concrete behavior is dependent on strain rate. In my study case I have different blast load and different concrete strength. How do I know that my numerical model is correct? I...

When only compression is left, it passes with all strain rates? I will check each tension with each strain rate. But if it wont work?

But when I use one of the curves (single graph) it is working