I am using Hilti products for a retrofit project per ASCE 41. The anchor type I am using is HIT-RE 500 V3 HAS
I am using PROFIS to calculate the anchorage nominal capacities (without Phi factors). However, the factor αV,Seis drastically changes my design for all the anchors I am using depending on the grade I select. The PROFIS report references the ICC ESR-3814 report but αV,Seis is not clearly defined, so I have the following questions:
1) Where I can find the definition of αV,Seis. I did not find it in ACI 318 nor the ICC report.
2) Should I use this αV,Seis factor for a ASCE 41 evaluation?
Please, don't reference https://ask.hilti.com/questions/what-are-reduction-for-seismic-tensionshear/knvkrh as it does not address my questions directly.
Hi Jorge,
Per ACI 355.4, Qualifications of Post-Installed Adhesive Anchors in Concrete, αV,seis is defined as the reduction factor for seismic shear loading. Section 10.20, Assessment of performance under seismic shear, provides further information for how αV,seis is derived. αV,seis is also explained starting here on page 302 of the PROFIS Engineering Design Guide. Moreover, ACI 318-19, Section 17.2.3.3, references ACI 355.4 for steel strength, Vsa, and simulated seismic tests.
While referencing ICC ESR-3814 for HIT-RE 500 V3, αV,seis values are reported in Table 6A – Steel Design Information For Fractional Threaded Rod.
ASCE 7 is referenced in ACI 318 and the Hilti’s ICC ESR. Further interpretation of ASCE 41 and post-installed anchors is at the discretion of the Engineer of Record.
If there are further questions on this topic, please email HNATechnicalServices@Hilti.com.
Regards,
Emily