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RE: Cost Effective Mechanical Lap Splice?

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Splice or lap length is a function of concrete strength. Increasing the concrete strength to 7000 psi must have given him enough lap length for the dowels, as installed.

Dave Gaines, P.E.

Structural Project Engineer
HDR ONE COMPANY | Many Solutions
251 S. Lake Ave, Suite 1000
Pasadena, CA 91101
T: 626.584.4960
F: 626.584.1750
email: david.gaines(--nospam--at)


From: Conrad Harrison [mailto:sch.tectonic(--nospam--at)]
Sent: Thursday, December 04, 2008 6:43 PM
To: seaint(--nospam--at)
Subject: RE: Cost Effective Mechanical Lap Splice?



Concrete is not my thing. But curious, why or how does increasing the compressive strength of concrete increase the strength of bond between steel and concrete? Assuming that is what lap length is about.




Conrad Harrison

B.Tech (mfg & mech), MIIE, gradTIEAust



South Australia

From: Bill Allen [mailto:t.w.allen(--nospam--at)]
Sent: Friday, 5 December 2008 12:54
To: seaint(--nospam--at)
Subject: RE: Cost Effective Mechanical Lap Splice?


If the contractor uses 7,000 psi concrete to get the required lap length short enough, can he go back to 5,000 psi concrete beyond the lap splice?

I can't see any reason why not, but I could be missing something.





T. William (Bill) Allen, S.E.


Consulting Structural Engineers
V (949) 248-8588 F(949) 209-2509