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I just went through some of the documentation, and one thing that immediately stood out was the highly technical details relative to what a construction worker would be expected to understand. Refer to the 2 details below as an example. I was taught to notate the drawings clearly enough that a...

Here's a section detail of the perimeter basement retaining wall. The ground floor plan calls up #5@12.

It seems these 2 events are somehow connected even though they happened on opposite ends of the building: - The pool deck collapsed a few minutes before the main building collapse, as per many eyewitness accounts. - Apparent rubble and burst water pipe a few minutes before main building...

@tab101: The eyewitness testimony refers to the pool deck collapsing, which is a couple minutes before the start of the security footage.

What is the in-plane shear capacity of an internal 110mm masonry wall 3000mm high? AS1684.2 CL8.3.5.8 covers unreinforced masonry bracing, but that's just for sub-floors.

Adding another floor to a single storey house, approximately 40 years old. External walls are double brick cavity. Internal walls are single skin 110mm brick, 3000mm high. I'll need these single skin brick walls to be loadbearing to support the joists/beams. According to AS3700, the wall can...

MarkHirschi - have you used this kind of arrangement before?

I am designing a one-way suspended concrete slab supported by exterior blockwork walls. The two interior blockwork walls are parallel to the slab span (perpendicular to the exterior walls) and I want to use them as shear walls but not vertical load bearing walls. I need some ideas on how to...

hokie, your approximation method also gets a mention here in chapter 4 http://www.steel-insdag.org/TeachingMaterial/Chapter17.pdf

Perfect, thanks

Thanks BA & hokie66 for your replies. I understand that closed sections are infinitely better for torsion, but this project uses a PFC which can't be replaced so I need to check it for torsion. If torsional shear action in a channel is Mt*tmax/J, what is the formula for torsional shear capacity?

In other words, what is the maximum rotation allowed based on maximum shear stress of a 250 PFC?

I have a 250 PFC fully fixed on both ends which supports outriggers which causes a large torsion on the beam. What is the forumla to calculate the torsional capacity of a PFC?

An I-beam requires a bolted full moment connection to an I-column. I told my friend it requires an end plate with bolts to the top and bottom flange, as well as angle cleats/bolts to the web. Whereas my friend is insistent that it's fine to just cleat the beam off the column and fix with a...

rapt: at some point along the beam there is a vertical stepdown, but only half the horizontal steps down. In other words the cross-section goes from a rectangle to an "L" shape. Is there any way to model this in RAPT? If not, how would you recommend analysing it? Cheers

BAretired: the east-west span is straight forward in terms of strength and deflection. As for the north-south span - would carrying the cantilever steel back an equal distance to the inside be sufficient? And what would control the deflection of those north-south cantilevers?

A slab is supported by blockwork in the shape of a decagon with a "radius" of 5.5 metres. The slab cantilevers out another 1.5 metres on all sides. There is a stud wall running through the middle which can accommodate internal columns. (please see attached) Instead of designing the slab with...

Cheers

Thanks hokie. What about for a continuous slab with multiple spans of different lengths supported by beams (where there's no general rule of 5/8 etc)... For the beam design: would you first model the continuous slab itself with transverse beams at the supports, obtain the reactions at each...

I have a 2-span continuous slab supported by walls on each side and a beam in the middle. The distance between the walls is 12m. For the beam design: do I use a slab panel width of 6m, or should I increase the panel width by 25% to 7.5m? Because I realised that the middle reaction for a 2-span...