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STAAD Commands and Input Instructions
Section 5
5-226
T
c
= Time period calculated per sentence 7(c) of section
4.1.9.1
CALC / USED PERIOD
The CALC PERIOD is the period calculated using the
Rayleigh method. For NRC in the x-direction, the USED
PERIOD is PX. For the NRC in the z-direction (or Y
direction if SET Z UP is used), the USED PERIOD is PZ.
If PX and PZ are not provided, then the used period is the
same as the calculated period for that direction. The used
period is the one utilized to find out the value of S.
3) In the analysis for NRC loads, all the supports of the structure
have to be at the same level and have to be at the lowest
elevation level of the structure.
Example
DEFINE NRC LOAD
V 0.2 ZA 4 ZV 4 RX 4 RZ 4 I 1.3 F 1.3 CT 0.35 PX 2 PZ 2
SELFWEIGHT
JOINT WEIGHT
17 TO 48 WEIGHT 7
49 TO 64 WEIGHT 3.5
LOAD 1
NRC LOAD X 0.75
SELFWEIGHT Y -1.0
JOINT LOADS
17 TO 48 FY -2.5