Hi,
I’m hoping someone is able to point me in the direction of the partial material resistance factor to use for FRP reinforcing bars in concrete elements in Canadian jurisdictions. I’m seeking the value and where it comes from (I.e. A23.3 or otherwise).
Thanks in advance.
I've received a specification from a client asking for CVN testing of the heat affected zone. The parent material is 350WT category 1. By my thinking, if the parent material passes CVN (by definition of the material specification) and the weld has as-welded properties that are tough, then the...
We're in a project to assess the condition of a groundwater piping system following observation of leaking in a line in a building. We've identified it's likely occurring by the microbiologically influenced corrosion (MIC) mechanism, which corroded an 8" sch 40 line (0.322" wall) through in a...
I'm working on a project for a mining operator. They have a reinforced concrete tunnel under a product storage structure, and the tunnel is highly chloride impregnated. Replacement in-kind of the tunnel is an option, but the price tag is rather high and indirect costs from lost production make...
I've been contacted to provide some repair recommendations for a building which has experienced shallow footing subsidence caused by an adjacent sub-grade parking structure excavation. The adjacent lot was excavated and the excavation walls were temporarily supported using anchors and...
I received a call from site, and the cast-in-place anchors I've designed and detailed were embedded too far into a pile cap. The result is we're cutting and abandoning the four cast-in-place anchors (unweldable) in favour of post-installed bars installed using epoxy. The cast-in-place anchors...
I'm working on an API 650 tank being fabricated from A240-316L plate with 18' diameter. Design thickness of the bottom course is 0.0835" and API clause 5.6.1.1 recommends a minimum shell thickness of 1/4" for the first course and 3/16" for the upper courses. Appendix S does not note minimum...
We've been retained to provide repair recommendations for an elevated water tank. The tank froze as a result of a water recirculation system failure in the dead of a cold Canadian winter. Large crack. I'm a structural engineer and I've done a number of water tower repairs, assessments and...
I'm not sure if this is the right forum to be posting, but I think this is as close as I'm going to come.
I'm working on a material estimate for several bins which require explosion venting as they store food products. The bins hold aggregate materials with reasonably large particle sizes...
I'm designing an API 650 tank and the governing venting requirements are from API 2000. There are a number of venting requirements from API 2000 (liquid from pumps, thermal, and emergency), but the one I have a question about it emergency venting. If the contents of the tank are not...
Good day.
I'm designing a connection for which I believe shear lag may be relevant. In this case, the supported beam is subject to both shear and axial force. So I've got a web stiffener welded onto the supporting beam so as to transfer the axial load to the flanges of the supporting beam...
I’ve been approached by a contrator to provide structural engineering services for an auger boring project. The project has been awarded and the prime contractor has asked the contractor to confirm the pipe size and grade is suitable for installation. Long term performance and operation is out...
Hello all,
I previously made this post http://www.eng-tips.com/viewthread.cfm?qid=426751
It was related to what the deflection limits on a single span bridge girder were in accordance with CSA S6. I've since done some calculations and have a follow-up question regarding CSA S6 deflection...
I've designed a number of piles, grade beams and slabs-on grade in the past. Typically they're for projects that are smaller and our rate/fee schedule is time based. We're quoting on a large construction project, and I'm wondering if there is any advice on a fee schedule based on some...
Here's a doozie.
If I place an anchor bolt in a slab-on-grade concrete floor (let's call it somewhere between 4" and 6") with unknown reinforcing steel layout (often the reinforcing steel is laying flat on the ground in SOG's), would you assume the defining capacity is the concrete cone that...
I’ve got a good question for everyone. How long does concrete last?
The context of the question is long-term mine opening closures. We’re contracted to close mine openings for a governmental regulator. We’re currently designing them to last a LONG time with stainless steel. They’re not...
I just received a phone call from a client who had a lifting/tailing beam nut loosen in transport. The part being transported is a cylindrical shell of ~24' diameter and length. The shell has lifting lugs on top and a tailing beam on the bottom. The tailing beam is left on for transport and...
Howdy folks,
I'm working on a project that has a 16" diameter stainless steel wheel which I'm proposing to fabricate from 17-4 stainless rolling on a 316 stainless steel flat bar. Wheel loads are in the 45kN range. Client has raised the question of galling. Can anyone provide insight on this...
Hello bridge engineers,
I've been asked to design a bridge for a client who makes temporary bridges. The client had another engineer making drawings for him, and I've been provided with a sample drawing. These bridges are very basic and are composed of longitudinal beams with a lumber deck...
I've taken on a design review for an old (pre 1970's) lattice bridge in an industrial complex with angle chords (2 top and 2 bottom) and lattice members. The top two chords are in compression and act as a built-up member. The scope includes reviewing the bridge in the context of the current...
