I often bounce back and forth between LRFD and ASD design depending on the type of project. Is there a reason why the LRFD version is substantially lower than the ASD version in this case?
Allowable Tension = 475 per Table 8 here:
https://www.hilti.com/medias/sys_master/documents/h04/hc4/9484430016542/Technical-information-ASSET-DOC-LOC-11337131.pdf
Ultimate Tension = 200-255lbs per Table 3, here:
https://www.hilti.com/medias/sys_master/documents/h2a/hf5/9695993823262/Technical-information-ASSET-DOC-LOC-9436445.pdf
I get that some of the difference is due to concrete strength, but even 255lbs at 6000psi factored is far lower than 475lbs at 7000psi for ASD.
Hi James,
Generally, ASD and LRFD values vary due to the differences in design methodology. Also, the values in one document are for cracked/uncracked concrete base materials, while the other is specifically for hollow core concrete panels. Unfortunately, no ASD data is available for the HDI-P TZ into cracked/uncracked concrete.
For additional assistance, please reach out to hnatechnicalservices@hilti.com or give us a call at 877-749-6337.
Regards,
Matthew