It is certainly an interesting topic of implementation of Generalized Interaction Equation of Failure Criteria for axial, shear, torsion, and biaxial bending particularly for those highly irregularly shaped and non-symmetrical 3D structural framework which may have all those effects combined particularly on members with high responsibility for the overall strength, stability, and stiffness of the entire structure. One could simply question if the general purpose 3D software take into account the Design Check of members for all those combined effects. Certainly one can never predict for sure which effect becomes more dominant than the others depending on the geometrical and dimensional characteristics or each specific 3D structure. Something that could deserve some good research, particularly for material properties and combined effects. Will be interesting to see if some type of Generalized Interaction Equation of Failure Criteria could be proposed that could apply to any material with the corresponding different coefficients for each participating effect.
Then once the type of material is selected, then the coefficients, and factors could be adjusted or applied to the generalized interaction equation and plugged into the 3D software so that the design check can be done automatically by the software for the particular values of combined effects at any section of the structural members of the framework. Quite a challenging proposition of course! But I am sure that there will be research university teams that could collaborate with ACI and AISC to see if this might be feasible.
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Pedro R. Munoz Ph.D., P.E., Archineer
Principal Engineer
PRM Engineering, LLC
Methuen MA
(978) 738-8001
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Original Message:
Sent: 05-24-2019 17:24
From: Sayed Maqsood
Subject: Combined Axial, Torsion, Shear, and Biaxial Bending for RC
This could be a good research project to compare concrete elements vs. steel using a suitable software. Here's a few general notes; concrete and steel elements experiences axial, shear, and moment forces mainly. Even for some of the symmetric structures, the torsional force is approximately 2% which is neglectable and that can adhere the building code requirements easily. Meaning; if torsion force is included in an assembly that's to output a general formula, the torsion force might have affected one way or the other. In specific, the steel structures behave under the above forces individually and as a whole structure. However, concrete is more rigid, and the torsion outcome can be seen from how the whole structure intake axial, moment and shear force and respond to it.
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Sayed Maqsood
Alameda, CA
(510)830-6285
Original Message:
Sent: 05-20-2019 10:09
From: Pedro Munoz
Subject: Combined Axial, Torsion, Shear, and Biaxial Bending for RC
Recently the AISC Engineering Journal Q2-2019 published an article authored by Bo Dowswell where he highlights his proposed Generalized Interaction Equation of axial, torsion, shear, and biaxial bending for open steel sections ..... See link below to download AISC publication.
Is there any research done in the field of Reinforced Concrete Structures where ALL the effects noted above for axial, torsion, shear, and biaxial bending may be significant and may have an impact on the final sizing of reinforced concrete members to account for Second Order Effects?
Is this generalized combined effects of axial, torsion, shear, and biaxial bending being taken into account in the General Purpose 3D Nonlinear Analysis Software Packages being used for Structural Framework where all these actions become significant for members with complicated geometry and 3D configurations?
https://www.aisc.org/publications/engineering-journal/#
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Pedro R. Munoz Ph.D., P.E., Archineer
Principal Engineer
PRM Engineering, LLC
Methuen MA
(978) 738-8001
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