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I am currently looking at a small project that requires a large section of the roof truss to be cut to allow a second floor extension to be built. I don't normally work on residential sized projects and therefore I require some general assistance and direction with this. The image below shows...

Can you allow for drainage through that location? In the past I have adopted a combination of Hot Dipped Galvanized sections and connections and have specified a drain pipe wrapped in geofabric below the location of the connections. Granular fill can then be provided to your desired surface...

@[BAretired] No, the concept was to only use screws. This is to ensure the install time is kept efficient and the costing can be kept to a minimum. However this may be considered should it be found that the screw-only option is not viable based on the calculations. @[KootK] Unfortunately as...

@[KootK] There has been independant testing that has determined the shear capacity of screws in reinforced AAC panels. The recorded results included characteristic values at both the initial shear slip as well as ultimate shear failure. For the purpose of my calculations, I was only going to...

@[BAretired] Thank you very much! It's all clear as crystal now

@[KootK] Thank you for the insight, I will start looking into this and will also see what FPInnovations have done. As I am using prefabricated elements (not possible to do with in-situ AAC, since it would all need to be cast in an Autoclave), I am trying to get a screw option to work. Preferably...

The AAC topping is actually a prefabricated 75mm thick steel reinforced panel. This will add fire protection to the CLT as well as boost the acoustic properties of the floor. My client wants to adopt this option without simply placing additional loading on the CLT flooring, but rather have a...

Hi, I am trying to design a composite floor member that will be subjected to the typical floor forces. The idea is to create a composite floor element that uses Cross-Laminated-Timber (CLT) and Autoclaved Aerated Concrete (AAC). The reason for this is to increase the Fire Rating of the floor...

Hi, I am trying to determine the deflection of a thin precast concrete panel (used as a wall) at the point of first crack based on a vertical load on the panel. I have obtained the cracking moment of the panel and therefore just need to calculate the deflection the panel will experience based...

Hi everyone, It seems like such a simple idea to me - however I require some guidance to determine the Characteristic values for a series of numbers. I am currently testing a new product to be released and I am currently testing the screw pull-out tensile strength through thin sheet steel. I...

At this stage I have put through two options for the builder to consider. One is with staggered screws along the web, and the other is screws through the flanges. As the builder wants a clean finish along the wall face - he will be more inclined to used screws through the web as opposed to at...

Thanks for the responses everyone. Great idea to stagger the screws. I have since calculated the lateral buckling of the compression member considering every second screw will restrain the compression flange. These screws will be fixed at a skewed angle to ensure the screw is properly fixed into...

Hi, I am currently designing a partition wall system with cold formed steel PFCs that contain horizontally stacked AAC (Autoclaved Aerated Concrete) panels. My question is in regards to whether my fixing arrangement allows for the PFC flanges to be laterally restrained so that I can take the...

Fantastic replies by all! Thankyou everyone. I plan to sleep well at night so I will keep my options limited to duhttp://www.eng-tips.com/ctile members only.

WARose Thank you for the reference, in regards to the design - I am currently at concept stage and I need to determine if this method of design is suitable for the project. I personally wouldn't allow for over-reinforced sections - however as it is not my field, I thought to reach out on some...

WARose how would I be able to best determine the point at which the concrete crushing occurs? I havent got access to FEA software - any guidance is much appreciated.

Hi all, In regards to non-ductile (over-reinforced) concrete members, I usually steer away from it all together as I would only design concrete members that are ductile. I am currently designing a RC beams that supports dead loading as well as traffic moving loads. As there is limited room for...