DESIGN OF ANCHOR CHANNELS
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VEREIN ZUR FÖRDERUNG UND ENTWICKLUNG DER BEFESTIGUNGS-, BEWEHRUNGS- UND FASSADENTECHNIK E.V. DESIGN OF ANCHOR CHANNELS VEREIN ZUR FÖRDERUNG UND ENTWICKLUNG DER BEFESTIGUNGS-, BEWEHRUNGS- UND FASSADENTECHNIK E.V. Kaiserswerther Str. 137 40474 Düsseldorf Telefon: +49 211/ 4564 106 Fax: +49 211/ 4564 218 Email: info@vbbf.de www.vbbf.de Status: October 2010

SAFETY CONCEPT UNCRACKED AND CRACKED CONCRETE TENSILE LOADS ON THE ANCHOR CHANNEL SHEAR LOADS ON THE ANCHOR CHANNEL BENDING LOAD ON THE ANCHOR CHANNEL SUPPLEMENTARY REINFORCEMENT CHARACTERISTIC ANCHOR CHANNEL RESISTANCES TENSILE LOAD SHEAR LOAD COMBINED TENSILE AND SHEAR LOAD DESIGN EXAMPLES CHARAKTERISTIC VALUES FROM APPROVAL Until now, the design of anchor channels has been carried out on the basis of building approvals from DIBt (Deutsches Institut für Bautechnik – the German institute for structural engineering) [1], [2]. In these approvals, the permissible loads are given in a table...

SAFETY CONCEPT UNCRACKED AND CRACKED CONCRETE TENSILE LOADS ON THE ANCHOR CHANNEL SHEAR LOADS ON THE ANCHOR CHANNEL BENDING LOAD ON THE ANCHOR CHANNEL SUPPLEMENTARY REINFORCEMENT CHARACTERISTIC ANCHOR CHANNEL RESISTANCES TENSILE LOAD SHEAR LOAD COMBINED TENSILE AND SHEAR LOAD DESIGN EXAMPLES CHARAKTERISTIC VALUES FROM APPROVAL Until now, the design of anchor channels has been carried out on the basis of building approvals from DIBt (Deutsches Institut für Bautechnik – the German institute for structural engineering) [1], [2]. In these approvals, the permissible loads are given in a table...

SAFETY CONCEPT SAFETY CONCEPT For verification of the load-bearing capacity, the value of design action must not exceed the design value of the resistance (equation (2.1)). value of design action value of design resistance partial safety factor for permanent actions (γG =1.35) partial safety factor for variable action (γG =1.50) characteristic value of the permanent actions characteristic value of the largest variable action characteristic value for further variable actions combination factor for infrequent effects characteristic resistance material safety factor The partial safety factors...

SAFETY CONCEPT SAFETY CONCEPT For verification of the load-bearing capacity, the value of design action must not exceed the design value of the resistance (equation (2.1)). value of design action value of design resistance partial safety factor for permanent actions (γG =1.35) partial safety factor for variable action (γG =1.50) characteristic value of the permanent actions characteristic value of the largest variable action characteristic value for further variable actions combination factor for infrequent effects characteristic resistance material safety factor The partial safety factors...

SAFETY CONCEPT Type of failure Anchors Steel failure Connection between anchor and channel Local flexure of the channel lip Hook head or hammerhead screw Bending of the channel Pull-out Concrete cone failure Splitting Blow-out failure Steel failure of supplementary reinforcement Anchorage failure of the supplementary reinforcement SAFETY CONCEPT Partial safety factor f γ Ms = 1.2 ⋅ uk ≥ 1.4 fyk Partial safety factors for anchor channels under tensile loads in accordance with [5] γMs,h = 1.8 for fuk ≤ 800 N/mm² and fyk/fuk ≤ 0.8: Hook head or hammerhead screw and anchor Local flexure of the...

SAFETY CONCEPT Type of failure Anchors Steel failure Connection between anchor and channel Local flexure of the channel lip Hook head or hammerhead screw Bending of the channel Pull-out Concrete cone failure Splitting Blow-out failure Steel failure of supplementary reinforcement Anchorage failure of the supplementary reinforcement SAFETY CONCEPT Partial safety factor f γ Ms = 1.2 ⋅ uk ≥ 1.4 fyk Partial safety factors for anchor channels under tensile loads in accordance with [5] γMs,h = 1.8 for fuk ≤ 800 N/mm² and fyk/fuk ≤ 0.8: Hook head or hammerhead screw and anchor Local flexure of the...

SAFETY CONCEPT The anchor channel may not be moved after installation and compacting of the concrete. 4. The correct installation of the anchor channels must be carried out by qualified personnel, particularly if the anchor channels are vibrated in. The installation must also be monitored. The partial safety factors shown in Table 2.1 and Table 2.2 are provided in the approval. Uncracked and cracked concrete Anchor channels can be used both in cracked and uncracked concrete. As a rule, cracked concrete can be assumed. When evaluating whether cracked or uncracked concrete is present, all...

SAFETY CONCEPT The anchor channel may not be moved after installation and compacting of the concrete. 4. The correct installation of the anchor channels must be carried out by qualified personnel, particularly if the anchor channels are vibrated in. The installation must also be monitored. The partial safety factors shown in Table 2.1 and Table 2.2 are provided in the approval. Uncracked and cracked concrete Anchor channels can be used both in cracked and uncracked concrete. As a rule, cracked concrete can be assumed. When evaluating whether cracked or uncracked concrete is present, all...

If the exact position of the loads applied is not known, for each failure type the most adverse position is to be assumed (e.g. load applied above an anchor for steel failure in the anchor or pulling out, and application of the load between the anchors for bending failure of the channel). Shear loads on the anchor channel Section 3.1 applies. However, in equation (3.1), NEd is replaced by VEd. It can be assumed that a shear load without a lever arm is applied to the anchor channel if the attachment is attached directly to the anchor channel or the concrete, or the thickness of any mortar...

If the exact position of the loads applied is not known, for each failure type the most adverse position is to be assumed (e.g. load applied above an anchor for steel failure in the anchor or pulling out, and application of the load between the anchors for bending failure of the channel). Shear loads on the anchor channel Section 3.1 applies. However, in equation (3.1), NEd is replaced by VEd. It can be assumed that a shear load without a lever arm is applied to the anchor channel if the attachment is attached directly to the anchor channel or the concrete, or the thickness of any mortar...