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thread507-491565 Hi all, I am trying to do some research on battered piles. Based on the traditional static method from the thread quoted above - if there is no bending moment acting on the battered piles, all vertical pile loads would be equal. Therefore, is it safe to say if the 2 outer...

Hi everyone, I have noticed the IRC has requirements for a deck lateral load connection, which seem to be typically done by installing multiple deck tension ties attached to the deck joists and interior main floor joists. Is this lateral connection required for decks in Canada? I cannot find...

Hi everyone, For the typical torsion formula T = J*max shear stress/r, what is the maximum shear stress for a steel circular shaft? Is it just the yield strength? For limit states design here in Canada, is there a specific resistance factor that needs to be used beside the typical 0.9? Thanks!

Hi everyone, I have a few general question regarding pressure treated lumber, specifically pressure treated deck joists. Before the joists are treated, are they graded in the same way a non-pressure treated joist would be? For example, in Canada most lumber joists would be SPF No. 2 Grade or...

thread256-461138 Hi everyone, I have asked a similar question in the past but I’m not happy with how I worded it. I will try again here... When designing a helical pile with a geotechnical report, the geotechnical report gives ultimate bearing capacities to design the helical pile helices...

Hello again everyone, I have a contractor who is building a large shed, using typical frost walls for the foundation, slab on grade for the floor and wood studded walls (14’ tall) and trusses. They are trying to build this thing as cheap as possible... For the walls, they are pushing for not...

Hi everyone, I have a situation where a contractor wants to use a 2X8 on the flat for a header over a new opening in an existing concrete wall. I am calculating the moment resistance of this 2X8 on the flat, and I am not sure what specified strength to use (in Canada, so using CSA 086). Table...

Hello, I am looking for some information on how the interaction equations for tension/compression and bending forces (combined loading) are derived. I know how to use the equations, I am just looking to learn where they come from. Thanks!

Hello, CSA O86 (wood code) provides interaction formulas for members that are subjected to combined axial and bending loads. However, I do not see any similar equation in the concrete code (CSA A23). Why is this the case? For example, I quite often see the axial force acting on a reinforced...

Hello, I have a question regarding “open” structures and the National Building Code of Canada. By an open structure, I mean a free standing canopy of sorts, with posts, beams and some sort of roof system (trusses, rafters, etc.). There are no walls, just the posts that transfer all loads to the...

Hello everyone, I have some questions regarding Part 9 of the National Building Code of Canada, specifically regarding foundation walls. Part 9 of the Code generally deals with residential and smaller commercial buildings. It is described as a prescriptive code. In this section, it states...

Hello! Let’s say you are pouring a 24’X24’ slab on grade for a detached garage. You have the typical edge thickening under the exterior walls, vapour barrier and compacted gravel under the slab, etc. Is it still common practice to create control joints in the slab? If so, what would the layout...

Hello, Is it possible for the cracking moment of a reinforced concrete beam to be larger than the ultimate moment of resistance? If I run the numbers with an 8” thick by 48” deep 30 MPa concrete beam with 2-15M bars top and bottom (very simple example) - I get a larger cracking moment than...

Hi everyone, When calculating wind loads, the national building code of Canada gives values for the external pressure coefficients “for primary structural actions” in Figure 4.1.7.6-A. It then gives different values for individual walls, roofs, etc in separate figures. When designing an...

Hello everyone, When designing a foundation in a normally consolidated clay, is the foundation designed for both the undrained (short term) and drained (long term) conditions? I typically see geotechnical reports that just state the undrained shear strength, with no mention of a drained value...

Hi all, I have a job where we have been asked to design a screw pile foundation for a weigh scale. Factored pile loads have been provided by others. The geotechnical report gives unfactored soil properties. Typically, the CFEM says to use a 0.4 resistance factor on the capacities. Is this...

Hi everyone, Quick question - what is the allowable bending stress in steel from S16 (Canadian steel code)? For example, I’m using the bending formula (stress = moment*centroid/MOI). For a steel I beam, is the max bending stress the yield strength or is it a fraction of that? I’ve seen other...

Hello! I have a question regarding factored vs unfactored loads. Sometimes I come across foundation plans that call out a required screw pile capacity as an unfactored load. In Canada, we can calculate a ULS snow load and SLS snow load – the only difference between the 2 being an importance...

Hello all, I have a scenario where a wall is to be removed in a bungalow and replaced with a LVL BEAM (3PLY 1.75”X9.5” 2.0E LVL, spanning 13’, simply supported). Ideally, each ply would span the full 13’. But let’s say there is a splice in one of the ply’s 4’ away from a support. Is it safe to...

Hi all, When designing a reinforced concrete retaining wall, I understand how you design the vertical reinforcement (cantilever beam conditions). How should the amount of horizontal reinforcement be determined? Is it simply temp/shrinkage amounts? Or is there something else that needs to be...