The major limitations of Master-slave command from modeling point of view is the following:
1. Master joint needs to be physically present in the model in the form of analytical node, either connected to model or exists in the form of an orphan node.
2. Location of the master joint needs to be calculated manually.
The above two limitations are overcome by floor diaphragm feature. It performs the following functions.
a. It calculates the center of mass for each rigid diaphragm where master joint is to be located, considering mass model of the structure (as defined by REF LOAD MASS option)
b. It creates internally analytical node at the center of mass location to be included during analysis.
c. It searches all nodes available in the diaphragm and make them slave nodes with master node located at the center of mass for the diaphragm.
In addition to these, the program is able to compute properly the followings in the presence of rigid Floor Diaphragm in the model-
1. CR
2. Storey Stiffness (displacement based approach)
3. Soft Storey Check
4. Torsional effect in the seismic analysis both in Static and Response Spectrum method.
In the view of the above, Rigid Floor Diaphragm commands provide you much advantages.
1. Master joint needs to be physically present in the model in the form of analytical node, either connected to model or exists in the form of an orphan node.
2. Location of the master joint needs to be calculated manually.
The above two limitations are overcome by floor diaphragm feature. It performs the following functions.
a. It calculates the center of mass for each rigid diaphragm where master joint is to be located, considering mass model of the structure (as defined by REF LOAD MASS option)
b. It creates internally analytical node at the center of mass location to be included during analysis.
c. It searches all nodes available in the diaphragm and make them slave nodes with master node located at the center of mass for the diaphragm.
In addition to these, the program is able to compute properly the followings in the presence of rigid Floor Diaphragm in the model-
1. CR
2. Storey Stiffness (displacement based approach)
3. Soft Storey Check
4. Torsional effect in the seismic analysis both in Static and Response Spectrum method.
In the view of the above, Rigid Floor Diaphragm commands provide you much advantages.