Background:
45' wall warehouse. 15' tall foundation wall (full soil fill) with 30' tilt-up panel on top. No bracing for either wall. Built on weathered dolomite (qa=5,000 psf) so rotation of a cantilever wall is likely minimal.
Question:
Are there any quick rules of thumb for establishing...
Can anyone explain to me why vehicles are designed with a windshield wiper reservoir capacity of about 3/4 of a gallon when the standard unit of fluid for sale is 1 gallon? I think all the vehicles I have owned, with the exception of my 2015 F-150 (maybe), only hold 3/4-7/8 of a jug of fluid...
I am looking at a project in which the owner is considering adding a story onto his existing one story building. Therefore, loads will be nearly doubled +/- so I will be forced to look at foundation capacity.
What non-destructive methods are available to determine existing spread footing size...
Is there any practical limit on the size of a parapet before it gets classified as something else? I have a project where the client is proposing a large (10-12') "parapet" (wall) around the mechanical units and to provide mounting for signage. As of now these walls are solid so no wind...
Hello all,
Does anyone have input on building design using Dlubal's RFEM software? I was recently contacted by them to attend a webinar and through some research, I am intrigued to say the least. I have used RISA since I have been out of college and I don't have much to complain about, but...
I have a contractor that wants to drive construction equipment and supply trucks (i.e. concrete trucks, dump trucks, etc.) over an existing precast tunnel. The 20' planks were specified to be designed in accordance with HS-20 requirements. I can't find any information if the HS-20 loading is...
I have a project in which the precast designer is requesting changing from precast shear walls to precast cantilever columns for various reasons. The columns will terminate at the second level precast podium slab. Above the podium will be 4 levels of wood shear walls resisting lateral loads...
Does anyone know of a good design example/reference for an anchored (single and multiple) soldier beam wall? I have been tasked with updating a previous design (never built) to the current LRFD standards required by my state's DOT. The original engineer on this wall is no longer with the...
I am working on a preliminary CIP 2-way slab that has large spans of ~ 40' in areas. My superimposed loading is 50 psf dead and 100 psf live (public area) and preliminary slab thickness of 18" is being used (225psf). If I proportion the slab so that the limits of ACI 9.5(c) (318-11) are met...
I have a situation where the client is requesting an HSS 12x8 outrigger be welded directly to the face of an HSS 12x12 column. Assuming that all of the checks work out on the column, (plastification, etc.) is there anything inherently wrong with a connection like this? Due to the applied...
I am working on a project that has several drilled shaft foundations for a DOT Noise Barrier project. I was given the boring logs for the project, but the nearest boring natural grade elevation is about 10' above the natural grade elevation where my drilled shafts will be. The project is in...
Is anyone aware of a good reference discussing the ability of a steel structural member to provide the needed reinforcing in a drilled shaft? I am working on a noise wall project and I have details from a previous project that show the only steel in the shaft is a w-section. These are cantilever...
I have a RFP for a project that involves built-up, riveted structural roof members. The idea (good or bad) is to add rooftop equipment to this portion of the roof. I have no idea where to start with budgeting for this type of analysis. No drawings/specs exist for the existing structure so...
I am back to working on the analysis of an existing 2-way slab that we have previously discussed. I have a question regarding how much moment is distributed to the middle strip when there is an exterior bearing wall present. See attached (3) pages for details.
I am analyzing this slab (circa...
While doing some research on 2-way reinforced slab design, I came across some interesting information about PT design. I would like to expand my knowledge of the design of a PT system so what references would you all recommend looking into? Remember, I need very basic stuff because I have no...
I am working on analyzing an existing exterior two-way slab (circa 1968) with drop panels and am looking to determine the design moments and capacities of the slab based upon current code requirements. This slab has been subjected to some significant weathering effects and most likely some...
I am trying to determine what the existing capacity of an wood-framed stage built around 1980 is. I have the 1974 version of the Wood Engineering Handbook and have found the values given for eastern pine which is the assumed material based upon existing plans. The chart lists the MOR as...
I have a project that is somewhat of a training facility for university-level construction students. The facility will be constructed/deconstructed twice annually. I have been asked to design concrete beams and planks that will be "precast" by the students on site and then lifted into place...
I am reviewing some existing plans and reinforcing drawings for a 2 way slab constructed in the 1960s. This is a 9" slab with drop panels and column capitals. I haven't designed one myself in the past, so my question is this, is it normal to have the top mat oriented 1 direction (say...
Since it is Friday, I need a bit of a sanity check.
I am working on a steel portal framed 3-story + basement project. Due to the amount of glazing and small brick bands on the building, I am attempting to limit drift of my steel portal frame to H/500 with a 50 year MRI per ASCE 7-10. This...
