When you are determining the distributed reinforcement in a deep concrete beam per ACI 318-19 Section 9.9.3.1, are you supposed to have 0.0025*bw*s of reinforcement area on each face or total between both faces?
I have a concrete textbook, Reinforced Concrete: Mechanics and Design by James K...
Do you folks include a maximum allowable fly ash limit in your standard concrete specifications? I know Table 26.4.2.2(b) of ACI 318-19 has a limit of 25% for Exposure Class F3 concrete uses. I wasn't sure if anyone puts any other stricter limits than that? A few things I have come across is...
I'm working on a precast parking garage with a cast-in-place topping slab applied over the precast double tees. I found the PCI Parking Structure Manual which has some good information on durability considerations including a geographical zone map and table shown below. For reference, this...
I have a project where a client wants to adjust the grading/slopes inside one area of a precast parking garage to meet ADA accessibility slope limits. To achieve this they are proposing raising the deck surface by anywhere from 0" - 4". I still need to check if this extra weight of concrete on...
See detail below for a general question I have. In the detail I am trying to brace the top of a new HSS column to the underside of an existing slab on metal deck. I don't want the slab or structure above to apply load to this new column. I am assuming that the floor above and the floor below...
If a multi-ply wood beam is unbraced for lateral torsional buckling, how do y'all calculate the beam stability factor for this beam, like a (4) 1 3/4" x 16" LVL? Do you consider the entire built-up 'composite' beam, thus when you calculate Rb=sqrt((le*d/b^2)) per equation 3.3-5 of the NDS...
If you are designing a wood beam with bending in two directions (strong axis and weak axis), how come you only need to check the shear stresses in each axis independently? Is there no sort of resultant or combined shear stress that develops on the beam cross section face? Seems like this...
I'm working on IRC townhomes and trying to implement IRC braced wall line methods for checking lateral. I'm not a pro with the braced wall line methodology, and I'm coming across some nuances with how townhomes/rowhomes are built that relates back to lateral resistance.
Refer to example plan...
I'm wondering what the standard practice is for setting the drapes on distributed PT tendons that run parallel to a load bearing wall in a two-way elevated PT slab. See snip below for example. Let's say I have my distributed tendons running east-west on the plan shown. At the tendons...
What do people follow for minimum reinforcement in concrete foundation stem walls where the soil is the same height on each side or there is a shallow crawl space to the inside of the foundation wall? See example detail images below that I pulled from the internet. For the vertical...
I'm wondering if section 25.4.10 of ACI 318-14 is applicable for reducing the development (lap) length required in a pedestal anchorage situation where you are attempting to lap steel column base plate anchors with vertical reinforcement in a concrete pedestal. This reduction is the one where...
Hi. I have a new building that will utilize a PT SOG foundation. I haven't designed a lot of PT SOG foundations, so this issue is something I haven't come across yet. This building will have a wood framed deck attached to it (ledger along the wall of the building supporting the deck joists)...
In the past I have typically detailed load bearing CFS joists to be attached to CFS studs either through a platform framed bearing connection or by running the joists into the wall cavity and screwing them directly to the side of the wall studs. I have used a track attached to the wall studs...
I have a 6" CMU parapet wall sitting on top of the edge of a 8" elevated concrete slab. See image below for reference. The wall is cantilevered (vertically) from the slab, so I want to make sure I'm not missing anything related to designing the joint between the CMU wall and the slab. When I...
My question here is pretty specific to Risa 3D, but anyone might be able to answer based on what you do in other programs or even with hand calculations.
I'm designing a CMU core in Risa 3D. It's a box with 4 sides/walls to it. Because these walls are connected at their corners, Risa 3D will...
I'm curious about how well kick bracing details work for the lateral support of interior partition walls in regards to allowing the roof structure to deflect without imparting a vertical load into the partition walls. I found the first two details shown below through a google search. Based on...
For brick veneer in stack bond, is there any reason I should be concerned with using a loose lintel schedule at face value as it relates the end bearing of the loose lintels?
I understand that the brick above an opening can't corbel in stack bond, so I have to design the lintel for all the...
I have a question about how exactly to analyze the lower portion when using the Two-stage seismic analysis procedure per ASCE 7-16 (section 12.2.3.2).
The way I see it, there are two possible ways to determine the seismic force distribution among the lower portion's levels and I'm not 100% sure...
See image below for two similar conditions. They are both for a CFS non-load bearing wall sitting on the edge of a low roof at a roof step. One is when we have steel joists bearing on the edge beam, and one is where the edge beam is parallel to the joists. I have a few questions related to...
I have some questions on how people typically specify drag/collector loads to truss suppliers.
See diagram below as a simple example. I understand what the loads are doing in the diaphragm and in the shear wall. But I'm a little confused on what they do through the pre-engineered trusses.
1...
