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Hi All, I see there have been several threads on this already but do not seem to answer our specific question. We have a low rise building < 15m using a system that has low ductility. As such we are permitted to use tension only bracing and no strict capacity design (CSA S16 conventional...

Hi All, We have a project where the contractor elected to pour concrete well past the time allowed for in the specifications. My understanding is the concrete was starting to get a little difficult to place (after 2 hours ) and the contractor added some water and then continued to place the...

Hi all, We are designing a steel building structure for and industrial facility. The key industrial process requires moving large amounts of water through open troughs. These troughs must be kept out of the direct light without adding rain so we need to provide rain weather shield. Not a full...

Hi All, I am working on an old building retrofit. The building was built in the 1940s of R/C, and the beams I have a question about are 12" wide and 24" deep. They are continuous beams with three bottom bars that lap at the supports and three top bars the are only over the columns. The beams do...

Hi All, This might not be the right section, however we are Structural and this problem falls on us for this project! We are working on a project where a very old Dam and spillway requires the ogee concrete surface of the spillway to be repaired and replaced. Currently the radial gate that...

Hi All, I am working on the foundation design for and elevated building module in the Arctic of North America. As a result, to protect the permafrost, the building needs to be elevated a few feet (+/- 3') above the ground. When doing this we have created a space that can have wind under the...

Hello, I am working on an assessment of an old structure and elevated water tank, it looks like it was designed in the late 1920's and built in 1930's (before 1931). The fabrication of the structure appear to have been by Horton Steel in Ontario Canada. I am looking to try and determine the...

Hello All, I am looking for some info on what the surge capacity is for a ASME B16.47 flange. We are designing a high pressure piping system for a hydro plant, typically when the pressure is this high (6000 kPa) we only use CJP welded steel pipe. I have a situation where the client is asking...

Hi, We are doing the structural design along a very large Clevis that needs to attach a large tension load to a concrete structure. For construcatibitly the clevis needs to be bolted onto the face of the concrete. Anchoring to the concrete is not an issue using quite large dywidag anchor bars...

Posted in the metals section but not too many responses! Hello, I am a structural and I need to weld a threaded weldlette to a 36" pipe to use as a float, so I can fill the pipe with expanding foam and then thread in a cap to seal up the access port. My question is: I am specifying pretty...

Hello, I am a structural and I need to weld a threaded weldlette to a 36" pipe to use as a float, so I can fill the pipe with expanding foam and then thread in a cap to seal up the access port. My question is: I am specifying pretty generic low grade pipe, there is almost no pressure load on...

Hello, I just received crane shop drawings and the crane supplier has noted a 2"x2" stock for the rail. To us this seems strange as typically we use standard crane rails and to connect to the crane beam we either bolt them, use a flat bar clap that is welded to the crane be a or a gantry clip...

Hello, We are looking at two items, concrete demolition in which we need to remove several inches and expose the existing reinforcing and secondly to prepare an existing concrete surface to receive new concrete. We have a tech spec that allows the concrete to be removed via chipping or light...

Hello, I am a structural looking for some help with a water tight detail at the base of a WWTP wall. The wall is 600 think and will have a water stop but is exposed to sewage on the inside face and I am looking at a sealant joint. I potable water we simple use a groove and then foam backer...

thread507-418612 Hello, I was looking up the shear transfer at the base of a retaining wall and came across this thread and was looking for peoples thoughts. I have a very heavily loaded tall wall that is fixed at the base. The wall is 1.2m thick and has +/- 10,000mm2/m of reinforcing for...

Hello All, I am looking for some information on determining both the flexural capacity and the shear capacity of a very thin walled round tube section (a pipe) I know there is reasonably good information in the various steel codes in North America about the capacity of Class 1 , 2 and 3...

Hello Civil Friends, I have a question regarding the application of buried HDPE Pressure pipe. We have an HDPE penstock that is conveying power flow for a micro hydro power station. The pipeline is almost 3 km long and we have done our best to optimise the DR of the pipes as we travel up the...

Hello All, I have a question regarding the lateral loading condition on a buried structure that is below the water table. The static condition is quite simple, At-Rest buoyant soil plus hydrostatic. However, when we need to consider seismic things get quite a bit more complicated. I have done...

Hi Civil Guys, I have a question regarding designing a CSP culvert for a haul road. When I am calculating the allowable buckling pressure I need to include an impact factor for the vehicle which increases the load depending on the burial depth, this would be considered pretty standard I think...

Hi All, I have a question regarding building a built-up timber beam out of 2x12 We have spec'd solid sam members and they cannot get them in time. The code has tables for 5-ply built-up sections but does anyone see any reason why a 6-ply would be a problem? Need it for capacity. As an...