Search found 5 matches

by EasonLu
Thu Jun 02, 2022 8:41 am
Forum: OpenSees.exe Users
Topic: Question about the weird variaiton of axial force at pier base during a nonlinear time history analysis
Replies: 7
Views: 6208

Re: Question about the weird variaiton of axial force at pier base during a nonlinear time history analysis

Thethinker wrote:
Wed Jun 01, 2022 9:40 pm
You have to adjust vertical DOF at the top of the pier, that will help you.FMWhatsapp APK
Okay, will try and thank you! As I am learning OpenSees, could you please advise me on the command that can restrain the vertical DOF? Thanks again!

Bests,
Eason
by EasonLu
Sun May 29, 2022 6:44 pm
Forum: OpenSees.exe Users
Topic: Question about the weird variaiton of axial force at pier base during a nonlinear time history analysis
Replies: 7
Views: 6208

Re: Question about the weird variaiton of axial force at pier base during a nonlinear time history analysis

Did you restrain the vertical DOF at the top of the pier? It could be the neutral axis of the section moving away from the geometric center, leading to apparent axial forces. Dear Dr. Scott, Thank you so much for your reply. By the way, I am a fan of you and following your blog at "https://portwood...
by EasonLu
Sun May 29, 2022 5:54 am
Forum: OpenSees.exe Users
Topic: Question about the weird variaiton of axial force at pier base during a nonlinear time history analysis
Replies: 7
Views: 6208

Re: Question about the weird variaiton of axial force at pier base during a nonlinear time history analysis

In order to increase the accuracy of evaluating seismic response of structures, it is critical to conduct dynamic analyses based upon precise nonlinear models being as consistent as possible with the real conditions of corresponding structures. The concentrated plasticity model including one elasti...
by EasonLu
Wed May 25, 2022 8:27 pm
Forum: OpenSees.exe Users
Topic: Question about the weird variaiton of axial force at pier base during a nonlinear time history analysis
Replies: 7
Views: 6208

Question about the weird variaiton of axial force at pier base during a nonlinear time history analysis

Hi, guys. Hope everyone is doing well. When I conduct a nonlinear time history analysis on a single pier model (20m), I notice the axial force at the bottom section is not constant during the whole process. Even worse, at some increments/times, the axial force increases/decreases dramatically. Since...