I have viewed other threads over the years about discussions on this matter and have read/researched information with respect to this and my conclusion is there is very limited information available. The item I am trying to better understand is thermal expansion in roof systems and how to...
When warehouse building dimensions get rather large, it is typically to put expansion joints in a metal roof deck. As the roof deck is being utilized as a diaphragm, a vertical brace system would typically be employed at the expansion joint location to maintain a simple diaphragm design...
Have a pre-engineered metal building that is located in a seismic design category C area. Per the adopted code, IBC 2015 and ACI 318-14, I am having a hard time distributing the horizontal loads from the seismic bracing. I was utilizing Hilti's Profis software and can not get a pier on its own...
Our client is really questioning the design of our purlins and want to make sure I am applying a section of the code correctly as I can not utilize the R-value method that pre-engineered metal building suppliers utilize in their designs.
I have calculated the z-purlin capacity connected to a...
Are there any published values for Cee & Zee sections used as purlins when attached to standing seam roofs. Per AISI, there is a reduction factor determined in accordance with AISI S908 that is to be used. I would think pre-engineered metal building companies either have their systems tested...
What is the lateral brace force at the end of a beam that is simply supported. Take for example cutting in a new opening in a wall that only has dead weight (CMU or Precast). A new steel beam is placed over the top of columns on each end for a steel frame in the opening. What is the required...
Currently working on a project that incorporates purlins (light beams- 12B16.5) at 9' oc for a building that was constructed in 1962. Looking at replacing RTU's that are heavier and am wondering if there was different design procedures +/-60 years ago that would allow these purlins to have the...
Have a project we are working on for a concrete batching plant. The design utilizes steel hoppers that sit on concrete beams that also support the divider walls for the different hoppers. See the attached rough sketch. Where I hope to get some input is with respect to the eccentricity that is...
So I have a building column on an exposed 4' pier that is attached to a footing. Column connection to pier is only shear and design would be based on Appendix D of ACI. Where I am drawing confusion is with the pier to footing attachment. As I have rather large tensile forces that I am...
Have a question with regards to an existing steel girder truss that will be modified; portion removed and column added at approximate mid-span. Both the top and bottom chords are attached with double angles to steel columns; see attached. It is my assumption that the connections should be...
Have designed post framed building before using the NFBA Post-Frame manual. All prior applications have used embedded posts so following the manual was rather straight forward. A recent job has come up with the request to have the posts attached to the concrete at grade without a fixed...
Been asked to look into a project for expansion at a feedmill. Typical construction of the walls that allow storage of commodities and fertilizers is attached and has been used on numerous projects; design by others. When I look at the typical wall section, this looks like a viable option at...
Been asked to look into a project for expansion at a feedmill. Typical construction of the walls that allow storage of commodities and fertilizers is attached and has been used on numerous projects; design by others. When I look at the typical wall section, this looks like a viable option at...
Looking to see if anyone has some tips/ideas to design the unrestrained basement wall as seen in the attachment. My initial design was a retaining wall. Like a typical project in the design-build field, the contractor thinks this is nuts and way overdesigned. Per the usual, they did not have...
For a wood framed building, the typical design in our office is to run diagonal braces at the gable ends. This provides a brace and load transfer mechanism at the hinge point when a gable end truss sits on top of a stud wall. This works fine for lower sloped and minimal width buildings.
A...
I am attempting to make a seat connection for a wide flange beam member. (2) HSS will be welded to the underside of the top flange of the beam to develop a seat for bearing on an existing joist girder. My question is with regards to determining the strength of the weld at the flange. I have...
I have been trying to wrap my head around how the deflections interact in the following problem I am presented with.
A structure with masonry endwalls, roof diaphragm, and portal frames has been eluding me. As seen in the attachment, I envision the wall bending as a simply supported beam...
Due to previous construction, I am stuck with stack bond. I have been looking at past threads and trying to research the design of stack bond masonry for both in-plane and out-plane loading. When looking at stress design, the compression width in a nut shell is based on if there are horizontal...
I have a steel w-section that supports bar joist from both directions. The loads are from a concrete deck and mezzanine storage live load that the joists support. The loading is over the length of the beam and is depicted in the attachment. The lengths of the bar joists are however not equal...
I have a multiple ply wood column that is braced at top and bottom. It is connected at the base by way of a steel channel bolted to the wood column. The bolts are close to the edge of the wood column. As the column wants to bend, the wood member will want to separate at the bolt hole location...
