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Hi everyone, I've got a question about calculating the number of piles for an isolated spread footing, or for any footing, for that matter. It seems simple enough, and in the end analysis, the answer as to the number of piles to use might not differ much at all one way or the other, in part...

Hi everyone, Does anyone know to determine the topographic factor, Kzt per ASCE 7-05. Most of the time we do not even have the information, such as whether our structure is on an escarpment, or on a 2-D Ridge or 3-D Axisymmetrical Hill. Does anyone have any luck using Figure 6-4 on Page 45 of...

Hi everyone, I am checking some shop drawings on the installation of checker plates forming the platform for a food processing facility. My platform are of various sizes, but let's say a typical platform is about 20 feet by 40 feet. My beams, typicall HSS, are spaced about three feet apart...

Hi everyone, Can anyone provide a clear and concise definition of "work point" as far as its use in structural steel drawings is concerned? I see it frequently in structural steel details - drawn as a dot with the initials W.P. - showing for instance, where the centerlines of two adjacent...

Hi everyone, I am designing a 5/16 inch checkered plate surface for the deck of my structure for a food processing facility. At the ends of the plate, I have to bend the checkered plate to form an edge of approx. 4 inches. As this is a food processing facility, the preference is for the...

Hi, everyone. I have got a question here of getting STAAD-Pro 2006 to print an output showing just the maximum displacement at certain nodes. Is this possible? Can I get STAAD to print this out, instead of me getting STAAD just printing joint displacements and for me to manually locate the...

Hi, everyone, I have been an owner of a HP-48GX for about 6 years now, and am now in the process of geting a cable so that I can download programs from the Internet into my hp for use. I have got a few questions for all you experienced users out there. One. I am more interested in structural...

Hi everyone, Does anyone know whether ACI has any provisions for concrete cover for water tight concrete? Section 7.7 of ACI provides for concrete protection for reinforcement in cast-in-place concrete and precast concrete. Section 7.7.5 also provides for corrosive environment. But how about...

Hi, everyone. I am trying to put together a Strength Reduction Factors table, per ACI 318-05, similar to the one from Notes on ACI 318-95. I hope all of you will join me in this "project" and help make it a success. As you all know, the strength reduction factors have recently undergone some...

Hi everyone, I am working on isolated spread footings for an industrial plant. I need to know the best way to calculate the development lengths for my reinforced concrete piers and reinforced concrete footings. I understand that you have to use a formulae to derive them now rather that saying...

Hi everyone, I'm designing isolated spread footings for an industrial plant and my research and discussions with colleagues are giving me differing answers to the minimum amount of steel area required for footing. Group I says the area of steel must not be less than the temperature or...

Hi, I am lookinng for some good resources on the analysis and design of foundations for vibrating equipment. Do you know of any? Any advice would be appreciated. Thanks.

Dear all, I am working on a multi-story frame constructed with hollow structural steel. The client's preference for this is due to hygenice reasons and all my connections are welded moment connections. I have some horizontal tubes for my structure. I am wondering whether additional bracing...

Dear all, I am working on determining the seismic forces acting on my multi-story frame and need to determine the center of rigidity at each level? Can someone please refer me to which readily available reference, or websites, to get these formulae? I also need to distribute the moment...

Hi all, Can someone please elaborate on what a "full strength penetration weld"? I needed to specify some welding to join two pieces of a cut wide flange section. I was told to use a "full strength penetration weld". Is this description sufficient to tell the contractor what to do. I would...

Hi all, Can someone please elaborate on what a "full strength penetration weld"? I needed to specify some welding to join two pieces of a cut wide flange section. I was told to use a "full strength penetration weld". I would have thought something like a butt weld might work. What kind of a...

Hi y'all, I got a question about how to input programs into my HP-48GX. I've got the calculator for about 4 years now but have mainly used the built-in functions and a Civil Engineering Pac that I bought. Now, I would like to try to input some of the programs available on hpcalc.org, for...

Hi everyone, Section 9.5.5.5.2 of the ASCE 7-02 states that when diaphragms are not flexible, the design shall include the torsional moment ... plus the accidental torsional moments caused by assumed displacement of the mass each way from its actual location by a distance equal to 5% of the...

My colleague likes to have all pinned supports for his structures, but I prefer a mixture of pinned and fixed supports. If I put in all pinned supports, then my structure becomes unstable. I am working on a baghouse support that is about 30 feet high. It has got a few bays of about 20 feet...

I have been getting a very unusual error in the analysis of the latest revision of my structure, a tall, wide but slim structure. This is how it read: "Error: Instability Found @ Node Rigid end J for member 521 (2.55, 6.04, 1.22) @ DOF UZ. Check the Element End Releases or Any Boundary...