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There's not enough information here to give advice on the mass concrete footing. But if the ground on one side of the wall is now lower than the other side then there's a new moment that the wall presumably hasn't been design for. This would need to be checked. In addition to that, you should...

Agreed. Thanks Retrograde

The slab will also be poured earlier in my case.

I'm of the opinion that even though it's a tank, it's still going to crack. I think the aim is more to limit the stress in the bars to well below it's yeild stress so that you get a higher number of small cracks (<0.1mm) that reduce how much water can flow through. I suspect if you wanted to...

I've decided to take the concrete as cracked and disregard the concrete in the strain / stress check. I'm now only checking the stress in the reinforcement. As the code stipulates that the service stress in the bars must be limited to approx 150MPa (depending on the situation), then I'd simple...

Hi All, I'm currently designing a self-standing concrete water tank to AS3735 (Concrete structures for retaining liquids). As per the code, you need to account for the forces (F_shrinkage and F_Swelling)from shrink/swell moisture variations. The code provides a table of mean shrinkage and...

Looking for some good ideas! No need to upload anything.

The balustrade does help quite a bit, the Rf increasing to 150 when I remove it. It is a deep stiff element but it's only supported by the stringer on the outside edge. I've used a relatively fine mesh (0.05m). I agree that it's not realistic that people will be walking on the external edges of...

It's basically a spiral staircase supported by a central circular hollow section, UC (I-section) cantilevered beams and PFC (C section) stringers. The treads and external balustrades are comprised of steel plates so I modelled them in to try to replicate the actual stiffness as opposed to the...

Thanks Agent666, the fundamental frequency is 18 Hz so it's well in the high frequency range. Any suggestions apart from increasing the stiffness to reduce the transient response factor? Even though it helps I can't really add mass to the system without changing the design intent.

Hi all, I'm looking for some guidance on the difference between the resonant/steady state and transient vibration. I'm designing a steel staircase in a public building and I'm currently checking it for footfall vibrations. I'm doing the analysis in Autodesk Robot Structural Analysis package...

Thanks Tomfh, that makes a lot of sense to break it up like that. As the creep factor is set on a logarithmic scale a 5 month duration gives about 1.8 so it's pretty close to Tedds j2 x (δG + ψsδQ)(figure 2.1)

Thanks Steveh49 and Agent666 for providing some clarity. It's good to hear how others are interpreting the code

Hi, I'm an Australian structural engineer and am currently trying to define the total deflection criteria for a timber floor. In the Australian standard AS1720.1 you determine a modification factor for creep (j2). The dead load deflection is noted by δG and the live load deflection is noted by...

Make sure you check wind reversal. If the solar panels are elevated then they can attract a decent amount of uplift.

As someone who has moved abroad for better design work I can definitely recommend it. Working on more exciting projects whilst picking up new skills and better ways of doing things were all worth it. You do have to risk some social and financial aspects so it really depends on what you're...