Questions tagged [eurocodes]

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2answers
57 views

Does Eurocode allow use of Robertson chart to determine soil type based on CPT results?

It seems that use of the Robertson charts (Robertson, P.K. [1990] " Soil Classification using the cone penetration test" Canadian Geotechnical Journal 27(1), 141-8) to classify soil type based on CPT ...
1
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1answer
42 views

What criteria must apply for torsional effects on this beam to be ignored in calcs?

I'm interested in how to work out whether torsional effects can be ignored or not, in calculating the adequacy of a given steel beam in the following idealised eccentric scenario. Or, equivalently, ...
1
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1answer
55 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 ...
1
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0answers
364 views

Difference between ACI Code and Eurocode in Stiffness modifiers?

According to the ACI Code stiffness modifiers (modifiers used to reduce the moment of inertia) are used for each structural elements for example 0.7 for columns and 0.35 for beams... For those who ...
0
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1answer
35 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 (...
2
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1answer
179 views

How to perform SLS check with strut-and-tie method?

I am using strut-and-tie method to design a corbel. I noticed that Eurocode mentions strut-and-tie only in section 6, which is ultimate limit state design. How do I perform serviceability limit state ...
2
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0answers
72 views

Clarification of cover definition in Eqn 7.11 of EC2 for calculating crack width

In EC2 clause 7.3.4(3), cover c is defined as the cover to longitudinal reinforcement. Say for a beam with cnom of 40mm and outer links of 16mm, the cover to longitudinal reinforcement will be 56mm. ...
2
votes
1answer
63 views

What is the definition of Ecm in equation 7.10 of EC2?

In the old British standard we use a time dependent modulus of elasticity of concrete to calculate crack width, which is usually about half of the 28-day Ec for long term modulus. In Eurocode EN 1992-...
3
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1answer
6k views

What is the effective depth of a beam with two layers of tension reinforcement?

In EC2 for calculating crack width and deflection, does the effective depth d refers to the depth from compression face to centroid of the tension reinforcement or is that calculated to the centroid ...
3
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1answer
196 views

What do the parameters k1 and k4 adopted in crack control tables in EC2 refer to?

Referring to page 123 of the code in EC2, BS EN 1992-1-1:2004, note 1 above Table 7.3N indicates that maximum bar spacing for crack control is derived based on $k_1$ parameter being 0.8 and $k_4$ ...
2
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0answers
518 views

General formula for calculating torsional and warping constants of built-up section

In order to calculate the elastic critical moment of a laced double I-section, I need the torsional and warping constants. Is there a general formula to obtain this? BS 5950 only has formulas for ...
2
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1answer
230 views

How can the shear capacity of a concrete slab be determined for effective depths under 200mm? [Eurocodes]

All, I'm designing a minor slab to Eurocode 2. It's purpose is more for show than any real structural purpose however I need to justify it's ability to resist it's own self weight and possibly the ...
2
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2answers
2k views

How to do section classification for a plate or flat bar?

When doing section classification to calculate buckling of a plate subjected to some bending and compression on its edges, do we consider the plate width as outstand of flanges "c"? What are the ...
2
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2answers
229 views

Assessment of a concrete beam being strengthened by an additional steel member

Hi there (from Europe), I am completing what should be a relatively quick assessment for the client, but I have started to second guess my self and would like some reassurance. Essentially the job ...
5
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0answers
116 views

What is the theory behind Eurocode 1 - Part 2: Traffic loads on bridges?

I'm interested in some theory Eurocode 1: Actions on structures - Part 2: Traffic loads on bridges. How were the limits chosen (e.g. maximum deck acceleration = 3.50 m/s2)? Why is the lower limit of $...
14
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4answers
3k views

Derivation for bridge natural frequency estimate in Eurocodes

The Eurocodes gives the following equation for estimating a "simply supported bridge subject to bending only"*: $$n_0 = \frac{17.75}{\sqrt{\delta_0}}$$ Where $n_0$ is the natural frequency in hertz ...
6
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4answers
8k views

How do you calculate Mcr (critical buckling moment)

When designing a steel beam, the resistance to buckling is related to Mcr; the elastic critical moment for lateral-torsional buckling. However the Eurocodes give no advice about how to calculate this ...