RR 22.01.00-3.3 ASCE 7 Seismic Irregularities Checks
STAAD.Pro can now check for vertical and plan irregularities per the ASCE 7 05, 10, and 2016 codes for structures with defined rigid floor diaphragms.
For ASCE 7-05/10/16, the program can check horizontal irregularities (torsional and reentrant corners) and vertical irregularies (mass). Irregular modes of oscillation are not considered for this code.
ASCE 7 Example Output
An example output section of an ASCE 7-2016 seismic irregularities check:
STAAD.PRO IRREGULARITIES CHECK - ( ASCE7-2016 ) v1.0
*****************************************************
--TORSION IRREGULARITY CHECKS
Torsion Irregularity Check
Ref: Fig. C12.3-1 T1- Ratio Limit(s): 1.20, 1.40
------------------------------------------------
Dia. Extreme Points of Dia in X Extreme Points of Dia in Z
Node Disp. Node Disp. Node Disp. Node Disp.
(mm) (mm) (mm) (mm)
------------------------------------------------------------------------
1 3 0.09130 1 0.09993 4 0.09484 1 0.10559
2 15 0.29636 13 0.30993 16 0.29819 13 0.34410
Diaphragm ΔX-max/avg ΔZ-max/avg Status
--------------------------------------
1 1.0451 1.0537 OK
2 1.0224 1.0715 OK
--GEOMETRY IRREGULARITY CHECKS
Re-Entrant Corner Check.
(Ref: Fig. C12.3-1 T2- Ratio Limit: 0.15 )
------------------------------------------
Node Re-Entrant X-Proj X-Proj/Lx Z-Proj Z-Proj/Lz Status
Connectivity Node ( m) ( m)
----------------------------------------------------------------------
6-> 5 0.0000 0.0000 7.0000 0.7778 Re-Entrant
4 1.0000 0.2000 0.0000 0.0000
18-> 17 0.0000 0.0000 7.0000 0.7778 Re-Entrant
16 1.0000 0.2000 0.0000 0.0000
Diaphragm: Lx: Lz:
( m) ( m)
----------------------------
1 5.0000 9.0000
2 5.0000 9.0000
--MASS IRREGULARITY CHECKS
Mass Irregularity Check
Ref: Fig. C12.3-2 T2- Ratio Limit: 1.50
---------------------------------------
Dia. Level Mass Above Below Ratio Ratio Status
( m) ( kN) ( kN) ( kN) Above Below
---------------------------------------------------------------------
1 0.000 341.643 253.287 Base 1.349 N/A OK
2 5.000 253.287 Top 341.643 N/A 0.741 OK