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ACI has a new techincal document that discusses alternative shear reinfocement (like Decon studrail). I don't know the name of the document, but you should be able to find through ACI publications order desk.

contact PCI; Prestressed and Precast Concrete Institute, Chicago.

your problem definition is incomplete. more info is needed to solve your deisgn problem. direction of loading, materials, geometry of weld joint. etc. hire a consulting engineer if you have no one on staff that can solve this design problem for you.

Poycarbonates are available with high impact resistance.<br>Used in many sporting goods. Helmets, etc.

There are a couple of industry committees that you may wish to check out.&nbsp;&nbsp;ACI-551 (Tilt-up Concrete Construction), Gary Weiler current chariman [<A HREF="mailto:gweiler@home.com">gweiler@home.com</A>] and TCA (Tilt-up Concrete Association) Ed Sauter Executive Director [<A...

Tilt-up Concrete Association

Try PCI 312-786-0300<br>and TCA - Mr. Ed Sauter 319- 895-6911

contact university of Wisconsin. They offer many many seminars and courses.<br>

Your question can not be answered without more details of the truss design, loads, deflection requirements, etc.<br> The manufacturers of prefab roof trusses publish span and load capacity information for their trusses. I suggest that you contact the manufacturers.<br>

Does the use of carbon fiber impregnated concrete create a galvanic couple with the steel rebar that leads to deterioration of the carbon fibers or the steel rebar?

We do place a dollar value on life in engineering design. Most structures and many mechanical devices (cars, airplanes, etc.) can be made safer for the user, but only at higher cost. <br> We all accept a certain level or risk upon our birth. We compound this when we buy and use potentially...

There is a release ASCE 7-95 and one about to be released ASCE 7-99. This is the industry wide bible for building loads.

Post your question to ACI concrete forum. ACI publishes a structural journal and a material journal bimonthly. Over the past few years both magazines have included many articles relevant to your inquiry. The authors of these articles can surely lead you to the products that you need.<br>

Thanks for the help.<br> I am David Niday.<br>

merbas;<br> Sorry for the delay. If your offer still stands, send to:<br> Engineering Services<br> 721 Richard Street<br> Miamisburg, Ohio 45342<br> Thanks, I appreciate the help<br>

I am concerned for the compatibility of Carbon Fiber Reinforced Polymerics in use in Concrete Structures. Is there a problem with galvanic corrosion due to the dissimilarity of Carbon fibers in close proximity to steel rebar or strand materials? Any responses are appreciated.

I am concerned for the compatibility of Carbon Fiber Reinforced Polymerics in use in Concrete Structures. Is there a problem with galvanic corrosion due to the dissimilarity of Carbon fibers in close proximity to steel rebar or strand materials? Any responses are appreciated.

OSHA requires a safety factor of 5:1 for all lifting hardware. This safety factor is found in OSHA Part 1910.<br>

Most rebar in use today is manufactured in accordance with ASTM A 615, grade 60. That is, 60 ksi yield min and 90 ksi tensile min.<br> There are other grades, grade 40, grade 75, etc.<br> and other specifications, ASTM A 706, eg.<br> I would assume ASTM A 615 grade 60 in most applications.<br>

I am developing a product that must withstand impact loads. I need a plastic injection moldable material that can withstand these type loadings. Any suggestions will be helpful.