Does anyone know of an exception based on the magnitude of the story drift? I have a two-story building with special concentric braced frames relatively symmetrical, seismic design category D. When I calculate the Torsional Irregularity, I am outside of the 1.2 limit, but the seismic drifts...
I have been asked to review an existing wood-framed building. My client wants to look at the wall studs as composite with the exterior OSB sheathing. I have never analyzed a wood-framed wall in this way and have a few concerns. One is the shear stress transfer to ensure composite action...
In reading thread507-104685, it got me wondering about the necessity of diaphragm chords being continuous. Suppose you have a steel deck diaphragm attached to a CMU wall (200' long) via a “continuous” angle bolted to the wall. The wall is designed as a shear wall when the shear force is...
As a continuation of an archived thread (thread726-55027), I have a one-story retail building braced with intermediate steel moment frames in a high wind region that also is in seismic design category D. Wind drift controlled the member sizes. My question, in regard to Taro's comment at the...
Does anyone know of a Code reference to the load required for a fire wall to withstand after collapse of one side of the building? IBC section 705.2 says the wall must not collapse after "collapse of construction on either side" - but my question is, under what load?. If it is now an exterior...
Does anyone know where I might find some structural cost data concerning seismic site classes? For example, how much construction cost savings could be expected for improving from a site class D to a C? For concrete buildings? Steel buildings? One-story buildings and multi-story? Has a...
I have an exterior pavilion framed in pressure treated wood. My columns are not standard timber sizes, but are "built up" of nominal 2x members (2x10s, 2x6s, etc.). I plan to use steel base plates with 2" grout underneath and anchor rods into concrete footing. Then plates or angles welded to...
I am looking for a practical reference book which presents foundation options for building adjacent to existing foundations. Interested in design considerations for underpinning, soil nailing, helical piers, micro-piles, etc. Also interested in a good reference for deep foundation design. Any...
All of the prequalified FEMA 350 connections have the column running up so, by implication, they do not apply at the roof where the column stops at the top of the beam. How do other engineers utilize these connections at the roof?
For WUF-B, WUF-W, FF, and RBS connections, where the beam top...
I have a moment frame of round columns (24" dia.) and W36 beams. I am welding a plate to the column at the top and bottom flanges of the beam and want to ensure the wall thickness of the column is adequate. Does anyone know of a reference for checking this local "punching shear"...
