I am using ASCE 7-05 for seismic design where i have to check the vertical irregularities of the structure using chapter 12 of ASCE 7-05.
For checking the soft story irregularity, i need story stiffness of the each story of the structure.
Please advise how to get story stiffness and story shear from STAAD pro.
To print the shears at each level, use the command PRINT LOAD DATA with the analysis command as shown next PERFORM ANALYSIS PRINT LOAD DATA The analysis output file will list the shears at each node and also by floor. To get the story stiffness, first ensure that you that you have floor diaphragms defined and then use the following command PRINT STORY STIFFNESS This command could be anywhere after the analysis command. Also it may be worth noting that STAAD.Pro can directly check for soft story as per ASCE 7-05 code. For that you need to use the CHECK SOFT STORY command, after the diaphragm definition, as shown next ... FLOOR DIAPHRAGM DIA 1 TYPE RIG HEI 120 DIA 2 TYPE RIG HEI 240 DIA 3 TYPE RIG HEI 360 CHECK SOFT STORY ASCE7 ...
In recent SS5 version of STAAD.Pro the floor diaphragm can be defined using the GUI. You need to go to General > Spec and click on the Node button to get the Node Specification dialog box. You will find a new tab called Floor Diaphragm using which the diaphragm data can be entered.
This could be defined anywhere after the Reference load type MASS has been specified. Also it should be specified before the Loads. A sample model is attached for your reference.
Story stiffness output is only printed when there are rigid diaphragms.
Will you please tell me how to compare base shear with code and how to scale that?