RAM Concrete Column - Eurocode UK NA Slender Column Design

Question

Hello, 
 I have recently picked up RAM SS and have run into some issues. I am trying to design some slender columns in Ram Concrete Column, but get the following output: 
 
 Column is SLENDER 
 Major Axis Capacity MRdy = 0.00 kNm Major Axis Capacity Ratio MEdy / MRdy = inf Major Axis Capacity < Major Axis Moment NOT OK for moment resistance Minor Axis Capacity MRdz = 0.00 kNm Minor Axis Capacity Ratio MEdz / MRdz = inf Minor Axis Capacity < Minor Axis Moment NOT OK for moment resistance 
 Does this mean that the program cannot design slender columns to the Eurocode?

Seth Guthrie · Accepted Answer

I spot checked one column in your file, using version 17.00.00.93. It's slender and fails because the Effective Length factor (K factor) is 4.0. In 2-way slabs systems, it's important to assign the Effective Length factor (in the analysis mode). because the program can't properly calculate it absent beams. I assigned 1.0 as a test (not a confirmed value) and the column I originally spot checked then works fine. You might also want to review the Sidesway criteria for this file.

Seth Guthrie · Answer

I checked the total dead load reaction from the Concrete analysis (Vertical reactions report) compared to the diaphragm force totals and it's within 0.3%, so I think it's OK.

Seth Guthrie · Answer

Can you send your file? I am getting results in a test file for a slender column, EN codes, version 16.01.00.20. There may be a point at which the column becomes too slender to give capacity results. Secure File Upload

RAM Concrete Column - Eurocode UK NA Slender Column Design

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