Daniel Bhaumik's Activities

Checking max deflection?

Daniel Bhaumik — Mon, 16 Mar 2015 17:19:35 GMT

Hello all,

I'm a student learning STAAD.Pro this semester.

I've done a beam model with two point loads applied. I've analyzed the model, but I haven't seen an output for what the actual value of max deflection in the beam is.

How does STAAD display this?

Thank you.

Resolve warning "Zero Stiffness in Direction... at Joint... Eqn. No..."

Daniel Bhaumik — Thu, 08 Jan 2015 15:48:46 GMT

I created a model and analyzed. There are 0 errors, but 26 warnings. 24 warnings are "Zero Stiffness in Direction... at Joint... Eqn. No..." and the other two are "There were more than 12 DOF with zero stiffness".

How can these warnings be resolved? There are no instability errors or warnings. The model does has member releases, and tension only and truss members.

How would a stadium structure be modeled in RAM?

Daniel Bhaumik — Wed, 18 Nov 2015 04:58:20 GMT

I've only modeled rectangular floor plans in RAM structure before. This particular assignment is a bit different (advanced steel structures class). How would I go about modeling this? If steps could be outlined for me to begin modeling, that would be most helpful.

Does STAAD show maximum shear & moments in the DECK or in the GIRDERS?

Daniel Bhaumik — Tue, 17 Nov 2015 02:20:52 GMT

We have modeled a two-span continuous bridge (50' spans), 6 girders in the cross section (60' bridge width). We are loading with truck & tandem loadings per AASHTO bridge design specifications. When analyzing for maximum positive & negative shears and moments, is STAAD telling us the max shears & moments on the GIRDERS or on the DECK?

How can we check the output analysis for maximum pos/neg shears & moments in the DECK? We are asking because we are doing hand-calculations for a concrete deck design.

Create Wind Definition & Assign Wind Load for Bridge (AASHTO 2012)

Daniel Bhaumik — Thu, 05 Nov 2015 23:18:34 GMT

Following is for student project in Bridge Engineering class:

We have modeled a two-span continuous bridge in STAAD. We intend to assign Wind loads, based on AASHTO 2012 values. How can a wind definition be created to assign a wind load?

Our wind loads are 0.05 ksf (transverse direction), 0.012 ksf (longitudinal direction) & wind component on live load are 0.1 ksf (transverse) and 0.04 ksf (longitudinal).

torsion

Daniel Bhaumik — Sat, 18 Apr 2015 16:54:45 GMT

how do i find torsion values in post processing mode of STAAD.pro

Undergraduate modeling 5 story structure in RAM Structural System

Daniel Bhaumik — Fri, 17 Apr 2015 01:34:13 GMT

Hello all,

I'm an undergraduate modeling a 5 story building in RAM Structural System for a structure class. I have several basic issues:

1. Load inputs: Snow = 30 psf, LL = 100 psf, DL = 3000 kips

QUESTION: Do I differ the loading between Floors and the Roof? What is the order of computer commands I use to access the appropriate screens to input these?

2. Building is being modeled as if it exists in Sacremento, CA. ASCE-07 is the code being used. What screens do I use to input loads for Wind and Seismic loads?

3. I want to create X-bracing at four different locations in the structure, on all floors. What commands do this?

4. After the bracing is created, I'd like to change the supporting columns to pin connections. What commands do this?

5. I'm using USGS for Spectral Response Acceleration Parameter values. Can these be entered into the RAM model?

For all questions, an answer would be a sequence of commands I enter to access the appropriate screens. Thank you for your help.

Unknown Material Type error?

Daniel Bhaumik — Sat, 11 Apr 2015 21:37:22 GMT

I'm modeling a 3 stringer short span timber bridge in staad. The model consists of the three beams and deck planks (which are modeled as Plates). All geometry, material properties, supporting, and loading have been assigned. There is only one error in the Output File, regarding the Materials. Seeing as how the materials are taken from the staad database, I don't see how this is occuring? Please review output file and provide advice. Thank you!

Timber causing Material error in STAAD Output?

Daniel Bhaumik — Sat, 11 Apr 2015 22:11:12 GMT

communities.bentley.com/.../3-Stringer-Basic.std

Problem caused by beam offset?

Daniel Bhaumik — Fri, 10 Apr 2015 23:49:02 GMT

I modeled a 3 stringer bridge with plates. I created offsets for the beams, but immediately after doing that dashed lines extending out appeared. Could anyone explain what's going on here?

Changing plate properties

Daniel Bhaumik — Fri, 10 Apr 2015 18:01:54 GMT

I'm modeling a short span timber bridge in STAAD, and using plates to model the deck planks. How do I assign either timber or user defined material properties?

Also, should I insert nodes at all places I want a deck plane and define a plate there?

Thanks!

Undergraduate student question on STAAD

Daniel Bhaumik — Thu, 02 Apr 2015 16:31:38 GMT

I'm an undergraduate taking a structural analysis class. Our lab section teaches STAAD, and I know I want to build a bridge deck like the one below. The bridge deck being modeled is a width-wise plank system for a short span timber bridge. I understand the load case. Could someone give a general guide to how I could model the deck itself? Is it a surface? What do the dashed lines represent?

Modeling deck planks?

Daniel Bhaumik — Wed, 18 Mar 2015 20:44:01 GMT

Hey all,

I'm an undergrad doing a bridge design using STAAD (fairly new to the program).

I'm modeling a bridge with wooden deck planks. The bridge is a short span composed of 3 longitudinal beams. Resting on the beams are deck plans spanning the width of the bridge. The planks are regularly spaced.

I know all the geometry, I know the plank length, width, thickness. But how do I actually model them? Do I use a surface? Also, could deflection in these planks be specifically analyzed in the post processing?

Assigning members values of Fy and Fu for A992 steel? How can I assign a steel with these properties?

Daniel Bhaumik — Wed, 07 Jan 2015 17:03:57 GMT

I am modeling a structure with W sections, and am using A992 steel for it. Staad automatically assigns steel to have the values for A36 steel. How can I assign properties to members so that they have the Fy and Fu of A992 steel?