The next seminar in the web-based Discovering OpenSees: Surfing the waves of OpenSees learning series will occur on January 30 & 31. The session will be broadcast twice to allow users in all time zones around the world to participate. This 1-hour session is titled “Modeling SCB Frames Using Beam-column Elements” and will occur on January 30 at 10:00 am Pacific Time & on January 31 at 4:00 pm Pacific Time.
Special Concentrically Braced Frames (SCBF) are commonly used as the seismic resisting system in buildings. During large seismic events they may experience buckling of the braces. These inelastic deformation of the braces place inelastic deformation demands on beams, columns and connections. Although the most accurate way to analytically capture the response of such systems is by using continuum models (based on shell or brick elements) it is time consuming and computationally expensive. Simplified but relatively accurate nonlinear model of a SCBF can be developed in OpenSees using beam-column (line-frame) elements. Such model can provide accurate simulation of global behavior, while retaining simplicity and providing reasonable predictions for many local behaviors. Force-based beam–column elements can be used to model the braces, beams and columns. Simulation of brace-buckling behavior can be achieved by using several nonlinear elements along the length of the brace that include nonlinear geometric effects and have perturbed geometry to simulate imperfection of the brace. Generation of such a model with three models of gusset plate connection will be demonstrated in this webinar. These include modeling of gusset plate using: (i) nonlinear elements, (ii) rotational springs, (iii) pins. While the first two models of the gusset plate connections can provide accurate responses of the system, the pinned gusset plate connection results in significant loss in accuracy.
This seminar covers:
- – Description of different modeling approaches of SCBFs
- – Generation of modeling SCBF using beam-column elements considering 3 different models of gusset plate connections
- – Comparison of seismic responses of a SCBF considering different gusset plate modeling approaches
- – Consideration of further simplifications of the model
- – Conclusions and summary
Once registered, you will receive a confirmation email with instructions for joining the meeting. More information will be posted at the Discovering OpenSees Wiki page.
After the seminar, please complete the short evaluation form to give OpenSees feedback and to suggest future seminar topics.
Past Discovering OpenSees Seminars – how to find past seminar recordings
For more information about the Discovering OpenSees Series including previous presentation slides, video recordings, and topics, visit the Discovering OpenSees Wiki page.
For more information about OpenSees, visit: http://opensees.berkeley.edu/