Muhammad Iqbal's Activities

Seismic Torsional Model and Floor Diaphragm

Muhammad Iqbal — Wed, 04 Jan 2023 11:07:52 GMT

Hello everyone,

I have issued my structure model using staad pro connect edition. I am modeling my structure with a floor diaphragm and added a torsional factor to my seismic load definition. The program informed me, that my modeling is an error or not correct. Here is the note:

***ERROR- ACCIDENTAL LOAD SHOULD NOT BE DEFINED IN SEISMIC
DEFINITION ON MODELS WITH RIGID FLOOR DIAPHRAGMS.
USE DEC AND ACC FACTORS ONLY.

*** STAAD.Pro ERROR MESSAGE ***
*** ERROR DETECTED IN LOADING 1

*** ERROR IN INPUT DATA FOR LOAD CASE 1 . ***

*** ERRORS IN SOLVER ***

When I am searching for the solution in this link

https://communities.bentley.com/products/structural/structural_analysis___design/w/structural_analysis_and_design__wiki/21193.torsion-consideration-in-is-1893-2002-seismic-analysis

I do still not understand the DEC and ACC values, and how to use the value from each of that parameters.

Here is my model, hope someone can help me solve my problem.

Kind regards,

Muhammad Iqbal

communities.bentley.com/.../7701.SEU_2D00_008_2D00_CAL_2D00_2298_2D00_S_2D00_0001_2D00_A_2D00_STAAD.STD

floor diaphragm and added a torsional factor

Muhammad Iqbal — Wed, 04 Jan 2023 11:11:48 GMT

Hello everyone,

***ERROR- ACCIDENTAL LOAD SHOULD NOT BE DEFINED IN SEISMIC
DEFINITION ON MODELS WITH RIGID FLOOR DIAPHRAGMS.
USE DEC AND ACC FACTORS ONLY.

*** STAAD.Pro ERROR MESSAGE ***
*** ERROR DETECTED IN LOADING 1

*** ERROR IN INPUT DATA FOR LOAD CASE 1 . ***

*** ERRORS IN SOLVER ***

I do still not understand the DEC and ACC values, and how to use the value from each of that parameters.

communities.bentley.com/.../SEU_2D00_008_2D00_CAL_2D00_2298_2D00_S_2D00_0001_2D00_A_2D00_STAAD.ANLHere is my model, hope someone can help me solve my problem.

Kind regards,

Muhammad Iqbal

Staad Pro Display

Muhammad Iqbal — Sat, 24 Dec 2022 14:45:58 GMT

Helo Everyone,

I have a problem with my staad pro display, I am using windows 11 Home Single Language version 22H2. When i am run my staad pro connect edition the display from some table show up like this:

Ask A Question I

Mon, 17 May 2021 01:04:40 GMT

Ask a question in a forum.

How to solve instability at join connection

Muhammad Iqbal — Mon, 17 May 2021 07:08:43 GMT

Good morning,

I have problem with my steel truss bridge design, i've used member specification release MY;MZ and truss. Then this message came after i am running the analysis.

***WARNING - INSTABILITY AT JOINT 490 DIRECTION = MZ

PROBABLE CAUSE SINGULAR-ADDING WEAK SPRING

K-MATRIX DIAG= 3.4113601E+05 L-MATRIX DIAG= 5.8207661E-11 EQN NO 366

***NOTE - VERY WEAK SPRING ADDED FOR STABILITY

Then i change my member specification release to just MZ, but i am not sure this correct to describe my design with actual connection. Although the warning sign not shown anymore.

How do i have to solve this problem with "Very Weak Spring Added for Stability", do i have to change the direction of release specification member into MZ only or any suggestion regarding my design?. I attach my design file, the first is DESIGN-001-MYMZ.std with release MYMZ and the second is DESIGN-002-MZ. Hope you guys can help me to solve my problem. Thanks in advance!

Kind regards,

Muhammad Iqbalcommunities.bentley.com/.../DESIGN_2D00_001_2D00_MYMZ.std communities.bentley.com/.../DESIGN_2D00_002_2D00_MZ.std