1 . Anchor Channel Systems |
All anchor channels systems in a test series shall complete the simulated seismic-tension load history . Subject the anchor channel to the sinusoidal tension loads with a cycling frequency between 0.1 and 2 Hz . All anchor channels systems in a test series shall complete the simulated seismic-tension load history specified . Failure of an anchor channel system to develop the required tension resistance in any cycle before completing the loading history shall be recorded as a failure of an anchor channel system to develop the required tension resistance in any cycle before completing the loading history . Test No . 12 is performed to extract seismic strength values for various failure listed above . |
Nominal tensile strength of a channel bolt for seismic design
ϕ N ss , seis ≥ N b ua
N ss , seis and ϕ are tabulated in Table ESR-3520 Table 8-10
Nominal tensile steel strength for local failure of channel lips for seismic design
|
ϕ N sa , seis ≥ N aua
N sa , seis
, and ϕ are tabulated in Table ESR-3520 Table 8-3
|
Figure 7.6.4.1 — Required load history for simulated seismic tension test |
Nominal tensile steel strength of connection between anchor and channel for seismic design |
Number of cycles 10 30 100 |
Anchors in structures assigned to Seismic Design Category ( SDC ) C , D , E , or F shall satisfy the additional requirements |
According to section ACI 318-14 section17.2.3.4.4 0.75ϕN pn for a single anchor , or for the most highly stressed individual anchor in a group of anchors . ϕ seis is 0.75 . |
Test no . Test Ref Test description f c ∆w |
Minimum No . of tests |
Channel Anchor Material |
Channel bolt
d s
strength
|
[ - ] |
Secion in Annex A |
[ - ] |
psi [ N / mm 2 ] |
inch ( mm ) |
[ - ] [ - ] [ - ] [ - ] |
inch ( mm ) |
[ - ] |
12 |
7.12 |
Seismic tension |
Low |
0.020 |
( 0.5 ) |
13 |
7.13 |
Seismic shear perpendicular |
to the channel profile |
14 |
7.14 |
Seismic shear in longtitudinal |
channel axis |