JORDAHL TECHNICAL INFORMATION JORDAHL JTA-RT High Capacity Anchor Channel

Transcription

1 For applications with high shear loads and reduced edge distances JORDAHL JTA-RT Anchor Channels with rebar tails offer high anchorage capacities for curtain wall applications. Often top of slab connections between the curtain wall and the concrete structure are dominated by high wind suction loads. JTA-RT Anchor Channels are especially designed to meet the requirements under these conditions, where small edge distances and high shear loads occur. They combine all the advantages of the JORDAHL JTA-W Anchor Channels, as easy installation and suitability for fatigue loads with additional horizontal rebar tails for additional shear capacity. JTA-RT Anchor Channels are available in three profile sizes, JTA-RT W4/22, W5/3 and W53/34 and can be installed as closed as 2 inches to the edge. The length of the channel and the number of anchors can be customized to meet the geometric requirements of the project. The adjacent load- displacement diagram shows a typical load bearing behaviour of a JTA-RT W5/3 with 3 inches edge distance. At the first load plateau small cracks began to form during the test, followed by a second drop of the load curve after failure of the concrete in front of the channel. Due to the tieback action of the horizontal rebar, ductile behaviour is ensured even under extreme impacts as e.g. seismic or blast loads. All JTA-RT channel types have been tested with the specified minimum edge distance. The recommended design values of this information for the JTA-RT series are in accordance with the ACI Failure Design Strength Service Strength Load [lbs] Load displacement behavior JTA RT W5/3,4,8,12,16,2,24 Displacement [in] DECON USA INC. page 1 of

2 JTA-RT W4/22-3 Design Nomograms Concrete Strength fc' = 25 PSI cracked h=5" cracked h=6" non non cracked h=5" non cracked h=6" Edge distance 2 in, no lateral edges Channel length = 12 in T-Bolt spacing 6 in Slab thickness 4 in variable, see design charts Concret cover might be reduced for h= 4 in Concrete Strength fc' = PSI Concrete Strength fc' = 5 PSI cracked h= 4" cracked h=5" cracked h= 6" cracked h=6" non cracked h= 4" non non cracked h= 6" un cracked h = 4" un un cracked h= 6" Separate T-Bolt design required, see JORDAHL JTA catalogue data. Load transmission into the structure must be considered in the general design. For customized design, please contact JORDAHL technical support. DECON USA INC. page 2 of

3 JTA-RT W5/3-3 Design Nomograms Concrete Strength fc' = 25 PSI 3 in Edge distance 3 in, no lateral edges Channel length = 12 in T-Bolt spacing 6 in Slab thickness 4 in variable, see design charts Concret cover might be reduced for h=4 in cracked h = 4" cracked h= 6" non cracked h= 4" non cracked h=5" non cracked h=6" non cracked h=8" Concrete Strength fc'= PSI Concrete Strength fc'= 5 PSI 8 cracked h= 4" cracked h= 6" 8 cracked h= 6 non non cracked h= 4" Tensile Strength [lbs] non non cracked h= 6" non Tensile Strength [lbs] non non cracked h= 6" non 8 8 Separate T-Bolt design required, see JORDAHL JTA catalogue data. Load transmission into the structure must be considered in the general design. For customized design, please contact JORDAHL technical support. DECON USA INC. page 3 of

4 JTA-RT W53/34-3 Design Nomograms Concrete Strength fc' = 25 PSI 1 1 cracked h= 7" cracked h= 1" 4 in Edge distance 4 in, no lateral edges Channel length = 12 in T-Bolt spacing 6 in Slab thickness 7 in variable, see design charts Concret cover might be reduced for h=7 in cracked h= 12" 1 non cracked h= 7" non cracked h= 8 " non cracked h= 1 " 8 non cracked h= 12 " Concrete Strength fc' = PSI Concrete Strength fc' = 5 PSI 1 cracked h=7" cracked h=8" 1 cracked h=7" 1 cracked h=1" cracked h=12" 1 cracked h=8" cracked h=1" non cracked h= 7" non non cracked h= 1" cracked h=12" non cracked h= 7" Separate T-Bolt design required, see JORDAHL JTA catalogue data. Load transmission into the structure must be considered in the general design. For customized design, please contact JORDAHL technical support. DECON USA INC. page 4 of

5 Calculation example JTA-RT W 5/3-3-2A 1. Given: Channel JTA W 5/3 RT-3-2A with 2 bolts JB M16; grade 4.6 Concrete 5 PSI, non-cracked condition; edge distance c 1=3 in; thickness = 5 in Design load acting on the bracket: Wind suction=5 lbs; dead load = 675 lbs; channel protrusion= 2 in 2. Loads acting on the channel: Shear: SH= V Ed= 5 lbs Tension: Moment caused by eccentricities M Ed= 5 lbs x 1. in lbs x (5 in 3in) = 6654 lb-in Tension = 6654/,85* 3in = N Ed= 261 lbs 3. Check channel capacity: Tensile Strength [lbs] 8 Concrete Strength fc'= 5 PSI DECON USA INC. Vu=5 lbs page 5 of NEd=261 lbs cracked h=6 cracked h=8" non non cracked h=5" non cracked 6" non cracked 8" 8 Point of combined action is within limiting curve of combined resistance => Design OK combined action combined resistance

6 4. Check T-bolt capacity: Loads acting on the bolts N u = 261 /2 = 135 lbs V u = 5 / 2 = 25 lbs N u = 918 lbs V u = 58 lbs Check Tension: Check Shear: Check Interaction: N u /φn n = 138/918 =.14 V u /φv n = 25/58 = =.26 1 JORDAHL Expert Design Team: With our products, we guarantee the highest quality and safety standards and offer customer-specific solutions to the highest level. The JORDAHL Expert Technical Consulting Team is at your disposal to support you on all occurring questions during the design process of JORDAHL Anchor Channels: Selection of the suitable type of channel Choice of material Optimized design and special solutions for curtain wall fastening Design-Trainings Software-Support Contact Information: For technical requests by phone and Fax: Tel (8) , Fax (95) sales@deconusa.com DECON USA INC. page 6 of