RE: Deflection Checking - Canadian Code - Serviceability Envelope

Jason Hoel — Tue, 31 Jul 2018 18:00:57 GMT

Thank you very much.

To anyone who may find this post, I have experimented and found how to make a total load / live load deflection check separate.

This checks the total load L/360 limit first, sizes the member, then checks the sized member against live load L/480 limit

STAAD SPACE
START JOB INFORMATION
ENGINEER DATE 30-Jul-18
END JOB INFORMATION
INPUT WIDTH 79
UNIT FEET POUND
JOINT COORDINATES
1 0 0 0; 2 20 0 0; 3 51 0 0; 4 71 0 0;
MEMBER INCIDENCES
1 1 2; 2 2 3; 3 3 4;
DEFINE MATERIAL START
ISOTROPIC STEEL
E 4.28151e+009
POISSON 0.3
DENSITY 489.024
ALPHA 1.2e-005
DAMP 0.03
TYPE STEEL
STRENGTH FY 5.28819e+006 FU 8.51708e+006 RY 1.5 RT 1.2
END DEFINE MATERIAL
MEMBER PROPERTY CANADIAN
1 TO 3 TABLE ST W360X39
CONSTANTS
MATERIAL STEEL ALL
SUPPORTS
1 TO 3 PINNED
MEMBER RELEASE
1 TO 3 START MX MY MZ
1 TO 3 END MX MY MZ
LOAD 1 LOADTYPE Dead  TITLE DEAD
MEMBER LOAD
1 TO 3 UNI GY -350
SELFWEIGHT Y -1 
LOAD 2 LOADTYPE Live REDUCIBLE TITLE LIVE
MEMBER LOAD
1 TO 3 UNI GY -770
LOAD COMB 3 GENERATED NBC 2005 ULS 1
1 1.4 
LOAD COMB 4 GENERATED NBC 2005 ULS 2
1 1.25 2 1.5 
PERFORM ANALYSIS
DEFINE ENVELOPE
1 2 ENVELOPE 1 TYPE SERVICEABILITY
3 4 ENVELOPE 2 TYPE STRENGTH
2 ENVELOPE 3 TYPE SERVICEABILITY
END DEFINE ENVELOPE
LOAD LIST ENV 1 2
PARAMETER 1
CODE CANADIAN
DFF 360 ALL
*CODE CANADIAN
LAT 1 ALL
*PARAMETER 2
*CODE CANADIAN
TRACK 2 ALL
SELECT ALL
*GROUP MEMB 1 TO 3
PERFORM ANALYSIS
LOAD LIST ENV 1 3
PARAMETER 2
CODE CANADIAN
DFF 480 ALL
CHECK CODE ALL
FINISH

RE: Deflection Checking - Canadian Code - Serviceability Envelope

Sye — Tue, 31 Jul 2018 00:53:29 GMT

You need to use the LOAD LIST ENV 1 2 to before the design to ensure that the design process uses the envelopes. Also I have commented out a few redundant PARAMETER and CODE CANADIAN commands to clean up the file.

In addition, when you do a SELECT you should group members and do a reanalysis followed by a CHECK CODE. A modified file is attached for your reference.

communities.bentley.com/.../4705.Structure1.STD