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  1. Batzo

    Damping matrix multi degrees of freedom

    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
  2. Batzo

    Cantilever (fixed-free beam)with point load - shear deformation

    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?
  3. Batzo

    Finding damping coefficient 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
  4. Batzo

    Resistance mdof with damping

    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...
  5. Batzo

    Single Element Analysis Abaqus

    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
  6. Batzo

    Validation for numerical modeling

    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...
  7. Batzo

    Concrete strain dependent - tension damage isn't correct

    Hi all :) I'm trying to model reinforced concrete subjected to blast, but when i try to run the model, i get an error: DURING THE CONVERSION FROM CRACKING TO PLASTIC STRAIN Abaqus FOUND NEGATIVE AND/OR DECREASING VALUES OF PLASTIC STRAIN FOR MATERIAL CONCR. VERIFY THAT THE DEGRADATION DATA UNDER...
  8. Batzo

    Cantilever - Full and Reduced Integration

    Hi everyone! I am writing a code in Matlab for cantilever beam with two load cases in the end - point load and moment (and linear shape functions). In Matlab I cant see visually shear locking. Is it right that will be a difference between Full/Reduced integration? What will be the difference...
  9. Batzo

    Cantilever with matlab (timoshenko, euler bernoulli, reduced integration)

    Hi! I am writing a code in Matlab for cantilever beam with point load at the end and linear shape functions. I can change beam's height and number of elements. The thing I dont understand is: Why reduced integration merged with timoshenko for deflection but merged with euler bernoulli for...
  10. Batzo

    Abaqus beam connection

    Hi I want to analyze this beam. I use 3d deformable beam wire. How do I connect h1 beam to h2 beam? https://files.engineering.com/getfile.aspx?folder=6fa75d40-8feb-4574-a224-2ad99ffe4a95&file=16215367626205263685530110463782.jpg...
  11. Batzo

    Theoretical Study Case in Abaqus

    Hi, Before my study , I want to verify 2 different experiments of concrete slabs subjected to blast. Concrete behavior is dependent on strain rate. I am using CDP, and i know I have to get the force-displacement curve for verification. In each experiment I need to find it's strain rate - how...
  12. Batzo

    Abaqus concrete subjected to blast, strain rate

    Hi, Before my study, I want to verify 2 different experiments of concrete slabs subjected to blast. The stress-strain curve is dependent on strain rate, and i find different rates in different articles. [ponder] How can I tell the right value for strain rate in order to verify the results of...
  13. Batzo

    Abaqus shell rebar

    Hi =) I model concrete wall as a shell with rebar option. In the history output request, there is an option of "include rebar" How can I see results for the rebar?
  14. Batzo

    Spread pressure on slab

    Hi (= There is a way to assign spread pressure load on a model? In the middle of the slab is the largest and on the end is less? (that will be also dependent on time)
  15. Batzo

    Step and field output request

    Hi [bigsmile] I model concrete wall subjected to blast, using CDP and explicit analysis. *In Step option I set Max. Time increment *In field output request I use evenly intervals *In history output I use every n time increment Is it right? I'm confused because I try to think how abaqus will...
  16. Batzo

    abaqus stability limit - reinforced concrete

    Hi, in order to calculate stability limit (of reinforced concrete): Δt≈min⁡(Le/C_d ) C_d=√(E/ρ) I have also steel rebars, so what do you recommend in selecting E and ρ? to use only the concrete metirial properties? I want to understand becuase i have two different materials thank you!!! :)
  17. Batzo

    fracture energy - reinforced concrete subjected to blast

    Hi, modeling reinforced concrete subjected to blast with CDP I use strain rate for the Dynamic Increase Factor (DIF) there is a way or a reason to add fracture energy as well? Thanks!
  18. Batzo

    Concrete subjected to blast

    Hi I want to ask about concrete wall subjected to blast. In using CDP, how to know which data to use? 1. Strain 2 Displacement 3.GFI
  19. Batzo

    Abaqus blast strain rate

    Hi Abaqus documentation is suddenly not available, I know there are three ways for hardening concrete subjected to blast (fix me if im wrong): 1. Power law 2. Johnson cook 3. Yield ratio Which one to choose? What are their equations...
  20. Batzo

    Abaqus warning

    Hi :) i did a wall section with rebars, but i get this warning: "For two-dimensional models, if a non-unity thickness is specified for two-dimensional solid elements and these elements are involved in an interaction such as contact, the same thickness should be specified for the out-of-plane...

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