Questions tagged [columns]

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Is it valid to solve for the young's modulus required for a given critical load with Euler Columns?

I am working on a problem for research that is about material choices. I was wondering if the following rearrangement of Euler columns would be a valid way to check to see if a material exists for a ...
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1 answer
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Calculation of critical column buckling load using Johnson's formula, but with eccentricity?

I've got partial answers but nothing comprehensive found online - most online resources focus on Euler's buckling formula which isn't appropriate for shorter columns. Data I have collected: Column is ...
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Clarification on Aluminum Design Manual

I am using the aluminum design manual equations to design an aluminum column that fixed at the base and free at the top, so fixed-free end conditions. Section C.3 of the Aluminum Design Manual says to ...
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2 answers
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How to construct rcc column footing on rock?

I am constructing my house on a rocky plot. Some of the columns will be placed over rocks and we were not able to dig deep in the rock. So, these column footings will be on the surface. Is it safe?
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1 vote
2 answers
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Shear Wall Boundary Element

When can I design a boundary element of a shear wall as a column? Is there a link to a solved example? Help please.
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1 answer
102 views

How to model leaning columns in opensees?

I want to modelling three buildings next to each other in opensees software . Duo to modelling leaning columns , buildings overlap with each other . Now my question is that for 3 adjacent buildings ...
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-1 votes
1 answer
93 views

Flexure Deflection - Both ends fixed (one translation free)

I have a flexure problem. One of its ends is fixed to a frame (say F1) which is stationary (no rotation & no translation) and the other end is also fixed to another frame (say F2) which can move ...
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3 votes
0 answers
273 views

Column Buckling Boundary Conditions -- Welded Tubing Practical Application?

I'm trying to do some calculations for a personal project. I'm trying to understand column strength / buckling. My questions relate to Effective Length Constant, which is based on Boundary ...
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1 answer
118 views

Simple steel column buckling calc - where am I going wrong? (Eurocode)

I'm trying to follow an example of this, but I get a wildly different answer than expected and I can't see where I'm going wrong. The example I've got, is for a 2.8 m steel column (RHS 150 x 100 x ...
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-1 votes
1 answer
707 views

How do i find the effective length factor (k) for a column from this chart?

I need to find the effective length of a column (kl) from this chart which can be found in the "design of concrete structure" By Dr. Arthur Nilson. the question states "if Psi top is 1.5 and the ...
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1 answer
60 views

RHS column profile able to replace 3m UC 152x23 column?

I'm having some work done in the UK (Eurocode) which involves a steel column to support a beam at 1st floor (US: 2nd floor?) level. The column bears a very-close-to-vertical total load of 47.3kN (...
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1 answer
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Can the two columns and little triangle thing be removed?

Can the two columns and triangle thing be taken off so I can add a porch.Is it a major job?
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1 vote
1 answer
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Elution from an Ion Exchange Column

I am using concentrated NaCl(10%) to elute Cobalt (II) ions from a cationic exchange column. How would I determine the volumetric flowrate of regenerant needed to completely elute the cobalt ions from ...
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2 votes
3 answers
80 views

Support columns inside metal tubing

Does structural metal tubing (e.g., either as HSS, or in space frames, or even motorcycle/bicycle frames) ever come with any small metal rods or columns inside of the tubing itself? While it might ...
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Shift Concrete Column by few inches

While building the foundation of a house, the concrete columns were built 15cm (6 inches) from the planned position, which is reducing the space for a door. The position that should have been there ...
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1 answer
4k views

How to find tributary area for a column when I have a transfer slab?

If I have a transfer slab in the basement level how to find the tributary area for the columns because the columns in the upper floors have different location and tributary area than that of the ...
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  • 503
1 vote
2 answers
536 views

Buckling of a cantilever with midway support

I'm trying to understand the implications for buckling and column sizing in the drawings below. A 3000mm 120x60 RHS steel column supports a 350mm horizontal steel beam. The column base and right side ...
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5 votes
1 answer
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Can the thickness of a guard post be derived purely from energy principles?

Consider an ordinary staircase with a banister rail supported by a wall at one end and a steel post of constant profile at the other end. The base of the post is embedded rigidly in the fabric of ...
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4 votes
3 answers
718 views

Why would a column expand before accepting load through a narrow thunk?

Here's a column top which holds a driveway overbridge. The column is a reinforced concrete cylinder with an inverse truncated cone on top - so it expands sideways at its top. The column top holds ...
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2 votes
1 answer
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For a column, what does "rotation fixed and translation fixed" mean

So there's a permutation of rotation and translation each being either fixed or free for a column. What do each mean? If the column is toe nailed to a plywood / beam underneath which is it? If it's ...
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  • 123
4 votes
1 answer
2k views

Reinforced Concrete Columns - Interaction Diagram Question

I'm confused about some concepts concerning interaction diagrams for reinforced concrete columns. Hopefully somebody will be able to answer these: Point with zero tensile strain, but before uniform ...
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11 votes
2 answers
4k views

Buckling: Do buckling mode shapes of n > 1 occur in reality?

In the buckling of columns we know that: $$P = \dfrac{n^2\pi^2EI}{L^2}$$ The smallest value of P occurs when $n=1$ which gives a simple buckling shape (one wave): $$P_{cr} = \dfrac{\pi^2EI}{L^2}$$ ...
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5 votes
1 answer
443 views

Axial deformation of variable cross-section member

I've been given a problem which I've attempted to solve, and hope some fellow engineers could possibly see if my approach is correct. We are asked to calculate a column's axial deformation due to an ...
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6 votes
2 answers
3k views

Tube Steel - ASTM A1085 vs. A500

Recently, tube steel manufacturers in the US have begun using the new ASTM A1085 specification for forming tube steel (a.k.a. hollow structural section or HSS) shapes, as opposed to the existing A500 ...
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9 votes
3 answers
12k views

Would a PE-pipe filled with concrete make a good pillar?

An idea that keeps popping up in my head, that I don't know enough structural/civil engineering to know if it's good from a technical point of view. Take a piece of polyethelene (PE) piping, fill it ...
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