Jiannan Wang's Communities Activities

Beam CS Torsion Design

Jiannan Wang — Mon, 25 Mar 2019 15:49:48 GMT

Hi there,

If a beam has its behavior set to be "No-torsion" in the "Mesh Input" layer, should its CS torsion design system set to be "Beam" or "None" or other?

Thanks!

Slab Deflection Output

Jiannan Wang — Thu, 16 Dec 2021 17:33:52 GMT

Hi,

In RAM Concept, is there a way to export/output the slab deflection in tabulated format along the line drawn using Selected Plot Distribution or in general?

Thanks!

Ask A Question II

Thu, 16 Dec 2021 17:35:36 GMT

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RC Two-way Slab Long-term Deflection

Jiannan Wang — Thu, 04 Jun 2020 16:52:50 GMT

Hi all,

I'm studying a two-way RC flat slab for a parking garage. 10" thick, 6000psi concrete, 10psf SDL and 40psf LL. The 5000-day deflection is 3" under 1.0SW+1.0SDL+0.25LL for a 30'X27' interior bay.

With the same geometry and concrete strength, SAFE gives 1.5" under the same load combo with nonlinear cracked long-term properties - a creep factor of 2 and shrinkage strain of 0.0005.

Why does RAMConcept give a much higher long-term deflection?

Note:

Concept creep factor is 3.35
Concept shrinkage strain is 0.0004
shrinkage restraint is 10%

Is it true that one needs to calibrate those factors to give a more reasonable long-term deflection for RC slab?

Thanks,

Jonathan

RAM Concept Load History Deflections - Eci

Jiannan Wang — Tue, 11 Feb 2020 21:03:02 GMT

Hi there,

When RAM Concept runs load history slab deflection calculation, does it use the initial elastic modulus Eci for initial stages or does it always use E?

For example if I have a load history as the following. Does Concept use Eci for the first 4 steps whose duration is 0?

Thanks in advance for your insight.

Column and Wall Rigid Zone

Jiannan Wang — Tue, 20 Aug 2019 14:57:41 GMT

Hi,

I am reading a post about modeling in RAM Concept. One of the questions mentioned rigid zones at columns and walls. See the snapshot below:

My question is what stiffness factors one should use for these rigid zones:

Thank you.

Unusual Load Factors

Jiannan Wang — Wed, 19 Jun 2019 14:54:52 GMT

I'm running a RAM Concept model with customized load combos to consider staged pre-stressing in the PT beams.

The following errors occurred while it's running. My question is if there are some rules i can follow to make sure such errors don't occur? Also does Concept still check the load combo even if it identifies it as an error?

Thanks very much!

Does Class C Apply to PT Two-way Slab

Jiannan Wang — Mon, 29 Apr 2019 13:19:38 GMT

Hi there,

I'm working on a PT two-way slab. Out of curiosity I switched the design environment from Class U to Class C and wanted to see if the design results were the same. Turns out, the design status is the same. Error 18.3.3 still shows up even when the design strip is designed as Class C.

Does that mean RAM Concept assigns Class U to a flat slab automatically? If so, when would Class C apply to a PT two-way slab?

Thanks,

Jonathan

PT Beam Shear Capacity

Jiannan Wang — Fri, 22 Mar 2019 18:37:11 GMT

Hi there,

I'm designing a one-way slab supported by PT beams.

When I audited the cross section that fails in shear, I noticed something strange about the shear demand and capacity.

Why is one section failing in shear but not the other? Shouldn't they both be failing? And should we be concerned about RAMConcept's ability for shear calculation.

Thanks,

Jonathan

Ask A Question I

Tue, 12 Jun 2018 00:56:40 GMT

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Concept Minimum Bending Capacity

Jiannan Wang — Tue, 12 Jun 2018 15:54:16 GMT

In RAM Concept, what's the difference between minimum bending capacity and maximum bending capacity for a PT slab design strip with no top nor bottom bars? Why are they different for the same section?

PT Design Strip

Jiannan Wang — Tue, 12 Jun 2018 16:02:05 GMT

Both design strips are supported at both ends

Here is the min demand/ min capacity result:

By simply changing the end condition of the cantilevered span design strip (the end on the slab edge) to non-support, the min demand/ min capacity result becomes:

Why would Concept add code based minimum top bars in the back span and therefore changing its min bending capacity?