Install Opensees 2.5.0 + Active Tcl 8.5 + Tcl Editor:


First uninstall all versions of ActiveTcl and Opensees which is existed in your Computer. Also erase Tcl and tcleditor folders in local Disk (C).
Then unzip attached file and accomplish steps1 to 3:
1. Copy tcleditor folder into Disk (C).
2. Install "ActiveTcl8.5.18.0.298892-win32-ix86-threaded.exe".
3. Copy and replace OpenSees 2.5.0 (rev 6344) into "Disk C/tcleditor/bin".
4. Now, use it and enjoy!!

@OpenSeesCommunity

The unique way to Consider P-Delta Effects (Large P-Delta) in 2-dimensional frames is Using Leaning Column Algorithm (Mrs-Laura Eads, Stanford University, 2010).
There is a command in OpenSees that is called "Geometric Transformation Command" which performs Linear/PDelta/Corotational geometric transformation of elements (Small P-Delta). Some researchers experience big wrong to use later instead of former.
@OpenSeesCommunity

In other words, adding Leaning Column Method is unique way to Consider Large P-Delta Effects in all Moment Resisting Frames/Braced Frames in which the PDelta column is for including the effect of the gravity frame PDelta effects on the lateral system, whether the lateral system is pinned or fixed at the base has no bearing on their use. As may seem in the picture, a leaning column carrying gravity loads is linked to the frame to simulate P-Delta effects.
Since adding leaning column increase the total base shear, the actual base shear of the MRF can be calculated summing all base shears comes from the columns including leaning column and then deduct the P*deflection/H to get the actual base shear.
Visit these links for more information:
http://opensees.berkeley.edu/wiki/index.php/Pushover_Analysis_of_2-Story_Moment_Frame
http://opensees.berkeley.edu/community/viewtopic.php?f=2&t=62522

@OpenSeesCommunity

Zerolength Element is used to construct a Zerolength Element object, which is defined by two nodes at the same location. The nodes are connected by multiple uniaxial material objects (less than number of nodal degrees of freedom) to represent the force-deformation relationship for the element.

@OpenSeesCommunity

Note that number of nodal degrees-of-freedom can necessarily be only equal to material directions which used in Zerolength Element Command, in addition to nodal degrees-of-freedom that are constrained at each of two nodes which linked by Zerolength Element.

@OpenSeesCommunity

Mrs Alicia asked a quite surprising question about the equation mentioned above for Zerolength Element command. Here, you can read her question and my answer!!

@OpenSeesCommunity

Mrs Alicia: As i understood, consideration of mentioned equation is essential for both of nodes which linked by Zerolength Element. Right?

Answer: No, Consideration of mentioned equation for only one of nodes which linked by Zerolength Element, would be enough.
Also, it should be carefully considered that nodal degrees-of-freedom corresponding to the defined material directions, for one (both) of nodes which linked by Zerolength Element, should be released.

@OpenSeesCommunity

According to users requests about the equation mentioned above for ZeroLength Element command, take the following model for instance:

Units: Kips, Inches, second

model BasicBuilder -ndm 3 -ndf 6

node 1 0.000 277.850 0.000 ;
node 100 0.000 277.850 0.000 ;
fix 1 0 1 1 1 1 1 ;
fix 100 0 1 0 0 0 0 ;
equalDOF 100 1 1 ;
uniaxialMaterial ElasticPPGap 2 381.800 -334.100 -0.5 ;

element zeroLength 1 1 100 -mat 2 - dir 3 ;


Equation cotrol in node 1 :

5 + 1 = 6 Right

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