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Dear all Does anybody know that how can i find modal properties in Ruaumoko software. Regards

Dear All I am dealing with a dynamic contact problem. I have a little problem when i apply Rayleigh damping (especially Beta) the model runs very slowly. While if i dont give Beta value then it runs ok. One more thing that am i applying this damping correctly? i am applying alpha in the mass...

Dear All I am designing a 10 story shear wall building structure. I have 2 lifts in the plan but i dont want to use rocking/core wall for that. I have seen some elevators with only columns and beams but could not find it. Can somebody refer me to some literature regarding these type of elevators...

Dear Samin I am also beginner in Abaqus :( . As for as i know, for the explicit analysis u need to select the Step (after initial step) named as Dynamic, Explicit. However the choice of explicit or implicit depends on ur problem type. If its not a complex (Contact) or highly dynamic problem...

Hello I have a problem with meshing. I want to use different meshing size in a same part. I have partitioned my PART to three parts and tried to seed the part by edges and give different mesh density to different partitions however does not allow me to have different mesh sizes and automatically...

Actually that 250 mm was when i run the analysis for first time but later on i changed the damping so it reduced to present value. This result is for a node at the top of the wall. Actually i got this time history from the results of acceleromete in the shake table test of this wall. May be i...

i think i am getting ur point but if u can elaborate more it will be helpful. Following are the links for the histories. http://www.flickr.com/photos/93814781@N03/8719316101/in/photostream http://www.flickr.com/photos/93814781@N03/8720439184/in/photostream First one is the acc, velocity and...

yes i get the Displacement time history using a software SeismoSignal. Is it wise to give displacemnet history as an input excitation because this displacement history is not looking very good. Its just like a sine wave. Can u guide me abt this inherent drift thing. Thx alot :)

I released the horizontal DOF of foundation but i applied the input motion (acceleration) at the base of the foundation (Not the wall). Any idea how to avoid this slip?

Dear Bkal Contact is established between the wall and the foundation with both normal and tangential behavior. Behavior of the structure is non-linear. There is a chance of slip movement between wall and foundation but it was observed to be zero rather foundation was slipping. For more...

Hello everybody I am doing dynamic analysis of a rocking wall. In the first step i applied the self weight and post-tensioning and base of the foundation was fixed in all DOF. In the 2nd step i have to apply dynamic loading. So i free the horizontal DOF of foundation base (EQ will be applied in...

Thx alot for replying. Yes i am using abaqus explicit (Sorry i did not mention it before) Actually my structure is a rocking wall structure and there will be gap opening and closing phenomenon at the intersection of rocking wall and foundation which means that the response will be non-linear...

Dear Drej My problem is a contact problem in which i want to get the results for horizontal and vertical response of the structure. (Especially acceleration values). I cant see anything in step properties to show the min dt. However we can specify the max dt. The max frequency i am interested is...

I was about to write the same thing that fixing time period can cause problems in analysis and one has to be cautious. How about automatic time increment: My time history has a time step of 0.0041 for each new acc. value. I used automatic time increment and the software is using 2*10^(-5) sec as...

Well its working fine for me now.........kindly illustrate your problem may be i can help u in this regard (although am a new user)

Dear Sdebock I am getting these error messages in my explicit analysis. "The option *boundary,type=displacement has been used; check status file between steps for warnings on any jumps prescribed across the steps in displacement values of translational dof. For rotational dof make sure that...

Dear Sdebock Now i am able to model the rocking wall correctly for quasi-static loading. Now my next step is to apply earthquake excitation to this structure. Since my model involves contact and high frequency phenomenon so i figured that abaqus implicit cant handle this problem. So now i...

Thx alot man. Its working. :)

Dear Sdebock Actually I have the excitation to be applied on the structure in terms of acceleration time history. From the manuals i came to know that i have to apply acceleration on the base nodes as a Boundary condition. The value of acceleration will be 'g' and i will change the amplitude of...

Hello Sdebock I have installed Abaqus 6.12 and now i am able to apply initial stress and everything is working fine thx to your support. Now i have another thing to do and again i need your help in this. I want to apply earthquake excitation to my structure but i dont know how to do it. So could...