July 24, 2018 at 3:33 pmRana NasserSubscriberHi everyone!
I need to know how to apply the earthquake in acceleration time history form on a strusture at the base level, thanks all
July 24, 2018 at 3:43 pm
July 24, 2018 at 3:48 pmRana NasserSubscriberPeter, thank you so much!!
July 25, 2018 at 5:12 pmRana NasserSubscriber
I've tried to apply the suggested procedures in the plog post and the other article that peter graciously attached in his last comment, but I still have a big problem!
My problem is that one of the structural elements material is a mohr-coloumb material and i can't do a modal analysis for the structure because of the non linearity of this material, so I can't use the EMM or the other 3 methods to apply the base excitation at the foundation level of my structure. Is there any updates on the EMM or any othre way that could help me to solve this problem?
July 27, 2018 at 4:11 pmRana NasserSubscriber
Is there any advice on how to apply the earthquake base excitation on a structure without using mode superposition?!
I'm trying to do this using APDL commands in transient analysis , but I cant find the right code to do it. is there any insights please!!
July 27, 2018 at 4:35 pmsk_cheahSubscriber
You could try to do a full transient dynamic analysis with large mass method. This method uses a large point mass coupled rigidly to the mount points. Force load is applied to the mass point such that the force divided by the mass is equal to the desired acceleration.
July 27, 2018 at 7:27 pmRana NasserSubscriber
Thanks so much for your response, Could you please attach an Apdl command file for any LMM dynamic analysis?
July 27, 2018 at 10:48 pmsk_cheahSubscriber
There are quite a few transient dynamic analysis in the VM page. Instead of applying force at one of the response DOF, you'll apply the force F on a large mass that's say 1000x of your total mass that represents the foundation. You can use MASS21 keyopt(3)=0 as the foundation with fixed rotational dof to avoid the model spinning in space.
- You must be logged in to reply to this topic.
Earth Rescue – An Ansys Online Series
The climate crisis is here. But so is the human ingenuity to fight it. Earth Rescue reveals what visionary companies are doing today to engineer radical new ideas in the fight against climate change. Click here to watch the first episode.
Subscribe to the Ansys Blog to get great new content about the power of simulation delivered right to your email on a weekly basis. With content from Ansys experts, partners and customers you will learn about product development advances, thought leadership and trends and tips to better use Ansys tools. Sign up here.
- Saving & sharing of Working project files in .wbpz format
- Understanding Force Convergence Solution Output
- An Unknown error occurred during solution. Check the Solver Output…..
- Solver Pivot Warning in Beam Element Model
- Colors and Mesh Display
- whether have the difference between using contact and target bodies
- How to calculate the residual stress on a coating by Vickers indentation?
- What is the difference between bonded contact region and fixed joint
- The solver engine was unable to converge on a solution for the nonlinear problem as constrained.
- User manual
© 2023 Copyright ANSYS, Inc. All rights reserved.