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Does anyone have any experience with ride-on laser screeds moving placed rebar during slab-on-grade pours? I am familiar with the cantilever reach version of these laser screed machines but I am very concerned that the ATV-wheeled versions that operate over placed rebars are being displaced and...

Does anyone have any experience with ride-on laser screeds moving placed rebar during slab-on-grade pours? I am familiar with the cantilever reach version of these laser screed machines but I am very concerned that the ATV-wheeled versions that operate over placed rebars are being displaced and...

FYI: As msquared48 alluded to, the method of obtaining the hole for the anchor is critical; hammerdrills will cause spalling on the inside face of ungrouted CMU cells that will not be evident. engphila

...sounds like you may be looking for a lateral "link" that can be designed to fail at a predetermined load. engphila

hawkaz is correct: be very conservative with your estimate of additional loading - and there's no need to be apologetic for perceived overconservatism, it's unreasonable to expect refinement with poor data and an overaggressive schedule. Years ago, an experienced engineer and former coworker...

Also, instead of doing just a mea culpa with your boss, think about presenting a solution along with your 'discovery'. Problems are much more palatable when their served with fixes. engphila

If you can find it, there's a great design guide for foundations supporting vessels called PIP STE03350. It also provides a decision tree towards evaluating whether a ringwall foundation is appropriate for your tank. engphila

...and there are more well-written spreadsheets at this site: engphilahttp://www.excelcalcs.com/option,com_fireboard/Itemid,145/func,view/id,358/catid,14/index.php?option=com_content&task=view&id=131&Itemid=207

All are fair comments, but every program has its own strengths and weaknesses; Knowing what they are and how to compensate for them is the real key. engphila

Its obvious who's at fault (the contractor) and how the QA was missed (the inspector) but the client won't be impressed with the detective work. Rather there needs to be options for successful completion of this project. Looks like cutting the column and chipping out to expose the rebars is...

Life is already short, and it's not getting any longer. If you were to die today how much would that project really mean to you? Then, finish it up, get home and hug your family . . . now! Remember, the immediate family is everyone on your side of the door you lock each night. And no one...

fattdad, . . . yes, this is the same flowchart/decision-tree that I referenced above in ACI360. engphila

FYI, I have always been told that the US has a lower overall tax rate upon its working citizens as compared to western countries, but now here's some supporting evidence: http://www.oecd.org/dataoecd/44/0/1942482.xls engphila

To address the where-do-I-locate-the-vapor-barrier question, please see ACI 360R where there is a convenient flowchart decision tree. The only more devisive topic do lather up a group of civil/structural engineers is probably guardrail design, but that's a different thread altogether. engphila

I have HSS carbon steel beams supporting stainless steel checkered plate as part of a platform. Can these two items be effectively welded? Is cathodic action a significant concern? Thanks for some guidance, engphila

These are all valid and justified points, however I must concede SlideRuleEra's point. We are usually contracted to provide a service to a client. It would appear that you have fufilled your contractual obligation. The owner has apparently decided to let the erector self-perform from the...

. . . and it might be a good idea to utilize a turnbuclke with whatever fixture your cable is terminated with, be it an "eye", hook, etc. or a combination fixture such as a turnbuckle w/eyes. engphila

I used a "crosby shackle" and wire ropes to guy a steel stack one time. The foundation attachment was basically a vertical plate w/several perpendicular stiffeners and a hole for the shackle. The vertical plate was welded to a base plate that was anchored to a pier and footing. It was fairly...

cfloor, The mechanical engineer developes a prototype, and then after extensive testing, development, and revisions, builds his creation . . . whereas people are currently occupying the civil engineer's prototypes! engphila

JAE, If the prevailing building code stipulates limit states as a design criteria, like what often occurs overseas, then you may have a valid point. However, IBC permits allowable stress for design. engphila