θy and θu for members

03-Analytical/modelling capabilities
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sanya greek
Posts: 74
Joined: 07 Nov 2018, 12:08

θy and θu for members

Post by sanya greek »

Hello!

After the Pushover analysis, where in the Code-Based Capacity checks i put Chord_Rotation_capacity with 1.Life_safety(B) 2.Immediate Occupancy(A)
3.Collapse Prevention(C), i took the results in Post-Processor-->Code-based Checks.

For example, i select in Code-Based Check Name --> Collapse Prevention. After i see
Image

In this case what does capacity mean? Its θu (ultimate)?

For example, i select in Code-Based Check Name --> Immediate Occupancy. After i see
Image

In this case what does capacity mean? Its θy (yield)?

I want to find θy and θu of each member, like here.
Image
where F is M, and δ is θ.

Thank you very much!
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seismosoft
Posts: 860
Joined: 06 Jul 2007, 04:55

Re: θy and θu for members

Post by seismosoft »

The theta,u and theta.y capacities are automatically calculated by the program. Refer to the help system or the manual to read the exact expressions. In fibre modelling, which is the standard in SeismoStruct, the Force vs. deformation curve is automatically derived by the program, based on the stress-strain diagrams of the section materials. If you want to use a multi-linear moment-rotation diagram like the one above, you may use SeismoStruct's displacement based plastic-hinge infrmDBPH element with appropriate Fy, delta_y and delta_u values.
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sanya greek
Posts: 74
Joined: 07 Nov 2018, 12:08

Re: θy and θu for members

Post by sanya greek »

Thank you!
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