Mukul Ghan's Activities

main beam and transverse beam strip in RAM

Niluka B — Fri, 05 Nov 2021 05:01:33 GMT

Hi This is the first time I'm modelling beam/beam intersection profile. I have a Transfer beams intersecting each other in RAM concept. But all the transverse beams sits on main beam creates high torsion on the beam which cant be happen. I need to know exact method of defining strips for this situation. Transverse beam in longitudinal direction(show with dash line) I move the design strips away from face of main beam. Then the main beams in latitude direction(show with arrow line) run until column which I model to design for column and middle strip. this middle strip lies in the transverse beam aswell.

Shown in dashline is the transverse beam and with arrows is the main beam which shows high torsion moment. The main beam with arrows I have defined to design for beam and middle strip. Wonder is it because middle strip moment it consider as torsion moment in main beam.

Design column strip for Column + Middle strip resultants option

Tejstruct Kumar — Sat, 27 Feb 2021 14:01:22 GMT

Hello,

I am working on a PT slab that has one PT beam along with banded tendons in latitude direction.

Ram concept manual reports to check Design column strip for Column + Middle strip resultants option if T-Beam is to be designed. This further explains as the beam is designed for column strip plus middle strip resultants and the middle strip does not have any forces. But if I check this option for PT beam, RAM displays initial stress failure plus bottom stress failure which vanishes if I uncheck the option. Per my understanding, if the beam is to be designed as a flanged T- PT beam, a total cross-section of the strip including the beam shall be considered to check the initial condition which would make the beam work in initial stresses. Additionally, there was bottom stress failure at beam which again is due to higher forces due to column + middle strip resultants and slab is not taking any forces.

The best approach per my understanding in case of PT beam designed as T-beam in RAM concept is, to check the stresses with Design column strip for Column + Middle strip resultants option unchecked and if the stresses are in check, run the model second time with Design column strip for Column + Middle strip resultants checked to get the total reinforcement for column + middle strip resultants in the beam and provide minimum reinforcement in the middle strip. This would add conservatism in the slab design as the middle strip is analytically not taking any forces but would resist forces equal to the capacity of the slab for the middle strip minimum reinforcement provided.

I want to confirm whether this approach can be implemented

RAM Concept - Strength Design v/s ECR plan

Mukul Ghan — Sun, 23 Jan 2022 02:36:19 GMT

Hi,

I had the following question about comparing the design output from RAM Concept.

For the strength design I get the following output from the Rule Set Designs>>Strength Design>> Status Plan

However, when I generate an ECR plan under the Service Design, I get the following output which shows signs of cracking at the same location

I wanted to ask about the difference between these two. Also, what parameters need to changed for the strength design to flag the cracking issue?

As far as I understand, I am getting the cracking issue due to exceeding the following entries from the "Load History Calc Log"

Does an exceedance in cracking load at the bottom face imply an excess of PT?

Thank you.

Modeling 2 way PT in the longitudinal direction and one-way mild in latitude direction

Mukul Ghan — Thu, 13 Jan 2022 16:29:18 GMT

I have a system with long-span PT girders in the longitudinal direction. Mild reinforced joists run perpendicular to these girders in the latitude direction. The slab is mild reinforced.

I am trying to model these into RAM Concept and was wondering if the best way to do this is as follows

For the strips in the longitudinal direction (along the PT girders)

For the strips in the latitude direction (perpendicular to the PT girders)

I appreciate your guidance regarding this. Thank you.

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Mon, 18 Mar 2019 00:25:53 GMT

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Joint Check - "No beams fixed to column flange"

Mukul Ghan — Mon, 18 Mar 2019 17:04:55 GMT

Hi,

I am trying to model the frame from the RAM Structural System Tutorial. Inside the RAM Frame module, I performed the Joint Check which outputted all joints to be "OK"

However, when I check the joints through "View/Update Joints" It shows a red signal showing "No beams fixed to column flange". I had modeled the beams between center-lines of adjacent columns. Am I missing a step in between?

Your help is highly appreciated. PFA a screenshot of the error. Thank you.