Hi Folks,
I need help calculating moments from wind load on the top and bottom flanges of steel bridge beams. Attached is a problem statement to calculate the maximum bending moment in the top and bottom flanges of the beam.
My approach was:
1. Find wind load tributary to top and bottom...
I'm studying the design of composite members (concrete deck over wide flange steel beam).
Per AISC we typically we design the PNA to be in the steel section (either flange or web) by choosing a stud connection capacity less than 100% of either the AsFy or 0.85fcb.
Lets say we chose studs to...
Hi everyone,
I have a low beam/HDR that supports a partial height wall above, and I want to detail the transfer of lateral load from this beam into an adjacent shear wall.
Please see the attached detail.
Wall top plates are continuous, bottom plates discontinuous. So I need to transfer shear...
Hi folks,
Page 69/133 of the NCEES PE SE Handbook is a deign aid table to the flexural design of concrete beams.
How do you read this table?
What is the top row? Side row?
For example if: Mu/(phi * b*d^2*fc) = 0.195, how do you use the table to obtain w? I can calculate it using the equations...
Section 7.4.1.3.1 asks you to calculate the seismic base shear using factors C1C2.
C1C2 can be found in table 7-3, but this table requires the value of m_max.
M_max by definition of the code is the largest m-factor for all primary elements of the building in the direction under consideration...
Hey Everyone,
I've been modeling slabs in SAFE, and each time I am getting area load loss errors. Some times the value of the loss is positive or negative.
I've made sure that I am not placing load over openings by investigating the shells causing the loss.
I haven't found any explanation on...
Hi everyone,
I am having a hard time understanding when to specify "development" or "splice length" in reinforced concrete design.
I understand that:
Development lengths are specified to prevent slippage failure, and transfer stress from reinforcement into concrete.
Splice lengths are...
Hi Everyone,
I am four years into my career as a structural engineer, and to be frank I am un happy with my salary.
I currently make $70 000 CAD working for one of the "big" consulting companies. I am an EIT, and expect my P.Eng by the end of summer.
My peers working in the public sector easily...
Something has been bothering me about principles of steel structure analysis and design...
In the design of beams for example, if I am intending to use a section's plastic capacity (Mrp), can I compare that to the Mfy obtained from elastic analysis? Or do I need to perform plastic analysis of...
Hi everyone,
To calculate a floor's center of rigidity, and distribute shear forces in a building's lateral system with a rigid diaphragm, you need to determine the relative lateral stiffness of your lateral force resisting elements.
For concrete shear walls, the relative rigidity is: 1 / [...
Suppose that a ribbed slab runs over a wall (the rib is perpendicular to the wall), and you want to transfer shear force from the web of the slab to the wall below.
One way to do that is to connect the rib to the wall using a steel angle, bolted to the concrete web on one angle flange, and then...
Hi Everyone,
I am trying to evaluate the bending capacity of an unequal length angle (L 127x89x9.5.
The CSA design equation requires you to calculate the symmetry parameter of the section and that involves the evaluation of an area integral. Please see the attached screenshot.
Does anyone know...
I am trying to evaluate the moment capacity of an equal leg steel angle using the Canadian S16-19 code.
The code requires you to consider factored bending moments about the principal axis.
I have calculated the factored moment about the geometric axis. But, I need the moment about the...
Had the pleasure of investigating a foundation wall failure of a garage structure: https://imgur.com/a/9W0z6PM
Home built in 1970, in Ontario, Canada. Foundation susceptible to frost heave if not embedded adequately.
First 5 pictures are of the side foundation wall, it is non-load bearing...
Suppose you have a laterally unsupported, simply supported wide flange beam subject to a uniform load. At mid span you also have a torsional moment due to a point load eccentricity.
Design equations in the Canadian code (CSA S16) tell you how to calculate Mr as related to uniform loading only...
Hi every one,
A client would like a garage built flush with one of the home's exterior walls.
I am detailing the connection between the new concrete garage foundation and the existing CMU foundation of the home.
I specified 15M dowls between the footings with min embedement of 12", but I am...
Is it ethical to showcase drawings and reports I have written with my current employer to a potential new employer?
I will be removing client information, professional stamps, etc.
Is this ok?
Thank you for your opinion.
I have been reading about the design of shallow moment resistant footings using "Foundation and Anchor Design Guide For Metal Building Systems" by: Alexander Newman
The author discusses the design of the foundation to lateral loads.
Horizontal thrust onto the foundation from a column above is...
If you have a light-weight steel stud curtain wall spanning between a portal frame. The studs sit in a track that is fastened into the concrete foundation below. How do you go about designing the stud anchorage into the concrete foundation below?
The wall itself must resist the applied gravity...
I am really interested in learning more about how structural design firms land projects to work on?
I am working in the insurance industry where insurance providers contact our firm and give us work. I guess, my firm also has established releationships with major insurance providers.
Let's say...
