RAM Frame- Steel Moment Frame Joint Stiffness

Saad Ahmed — Thu, 18 Oct 2018 13:41:25 GMT

How does RAM frame handle joint stiffness reduction when analyzing a steel moment frame? I have a structure with steel moment frames and would like to explore the option of using flexible moment connections. What is the process of reducing joint stiffness in the RAM Frame model and how much does it needs to be reduced?

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RAM Structural System- CMU Shear Walls

Saad Ahmed — Fri, 21 Sep 2018 01:20:19 GMT

I have a few questions regarding CMU walls in RAM SS. How are CMU shear walls handled in RAM structural system to obtain lateral load distribution? I have a steel structure with exterior CMU walls which I want to use as shear walls. The CMU shear walls were modeled as other material using the following properties for a f'm=2000 Psi.

Thickness= 4.9 Inches (Equivalent solid thickness for an 8" CMU with 32" O.C grouted vertical cores)

E= 1800 ksi

Unit Weight= 105 Pcf

Poissons ratio= 0.2

Are these properties appropriate for an 8" CMU wall? Should the crack factor be directly applied to the thickness/young's modulus? The CMU walls were modeled at 6" away from the perimeter beams and connected to the beams using a "Other beam" at the ends to satisfy RAM SS requirement's to connect wall ends. The CMU walls fall under the slab edge.

Using the above mentioned approach, looking at the model with CMU shear walls, the lateral force distribution is not making sense. I have uploaded the model for reference.

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Fri, 21 Sep 2018 01:20:20 GMT

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RAM Frame- Steel Moment Frame Joint Stiffness

RAM Structural System- CMU Shear Walls

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