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Are there any differences between the usage of prefabricated welded reinforcement mesh and manually on site rebar reinforcement in a flat slab? So if we have a 250 mm flat slab with welded prefabricated mesh, would it behave in anyway shape or form better than the same exact slab but with rebar...

What's a good book to read that deals with the design of a vierendeel concrete truss? Thanks.

Thank you so much; especially KootK. This has been very informative.

Can somebody please explain to me the difference between contact splice lap and non-contact splice laps in columns. I have always thought that the vertical steel acts as channels for the force to go through it. In order for the force to transfer to the next rebar, they should be bundled...

Thanks. I have done it and based on my initial analyses, it looks like that it will work.

I am aware of the fact that changing the rise dimension of a staircase might cause accidents. So I did not change that. However, I changed one of the floors tread by 20mm. The entire building has 300mm steps except for one of the middle floors which has 280 mm steps. I would like to point out...

I am designing a building that is architecturally beautiful but structurally not so much. The face of the building recedes back 1000mm from the front and 500mm from the left side for the upper stories. I cannot take the columns for the upper floor plans all the way to the bottom. This would ruin...

I am designing the underground parking slab. It will be a solid slab that is roughly 25m x 27m. About one third of it will be at a lower elevation with a part of it having a 6% incline to connect to the rest of it. I have consulted our senior engineer and he told to design it as if it were a...

Thanks for the help. I work in Israel at the moment. I was educated in the United States and used the Imperial system of course. I am fairly new practicing engineer and I am not sure whether they use the cm or not around here.

The slab is supported at the perimeter by a load-bearing wall. The opening is near one of the corners; it's 30 cm (~12") away from the walls in both directions. The slab thickness is 25cm (10"). The service loads are about 15 kN/m2 (~300 lb/ft2) for the dead load and 2 kN/m2 (~40 lb/ft2) for the...

I am designing a 25cm (~10") two way solid slab. The dimensions of the slab are 300cm x 300cm (120" x 120"). The slab contains a square opening; 70cm x 70cm (28" x 28"). My question is what design considerations do I need to consider when designing this slab? Do I need to provide beams around...

I am about to use SAFE for the first time in one of my projects. The slab is as show below. I have watched some instructional videos on how to create a model in SAFE. I have few questions. I am having issues importing it into my model. I am not sure what I am doing wrong. I am also not to sure...

Thank you so much for the reply. I was referring to the connection between the chords and the web members. I am not asking about the supports. Since you brought it up, the connection to the support is designed using steel plates. The columns are I shaped members with a steel plate on each end...

I am analyzing an already designed Steel truss. I am not 100% sure what the boundary conditions should be in Risa3D. The HSS sections are welded with a 6mm (0.25 in) fillet weld. The truss as shown is in the XY plane. What do you suggest the boundary conditions of the nodes should be? By...

I ended up modeling it in AutoCad and importing the DXF file into Risa. It was the easiest way. Thanks for all the advice.

I need to analyze a steel arch model and check its adequacy. I need to create a model for it. It is a two dimensional, half a circle truss. It is very similar to the one shown in the attachment below. Except mine is half of circle. I have both SAP2000 and Risa 3d, as well as a program called...

Thanks for the advice. I got my hands on the tenth edition of the CRSI Design Manual. I will be reading chapter 11 of it; waffle slab design. It's a good place to start. If I have any questions, I'll be back. Thanks again.

I would really appreciate it if somebody would post a link or a document that showcases an example of a complete waffle slab (two-way joist slab) design. I have found several links online but they almost all explain how to figure out the dimensions with little mention of the reinforcement...