FAÇADE
Dimensioning of MVA / FA acc. to General building approval Z-21.8-1979
N
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General
HALFEN SP Sandwich panel anchors HALFEN offers three different types of anchors to connect facing and load-bearing layers of sandwich elements.• SP-SPA Sandwich panel anchors • SP-FA Flat anchors
• SP-MVA Sleeve anchors HALFEN SP benefits
• quick and easy asmbly
• easy planning with the
free HALFEN Software
• safety through building authority approvals
• EnEV-compatible with minimal thermal bridges
• sustainability through high corrosion resistant stainless steel
• combination of different systems
for high versatility, for example in thin building components and above openings
Dedicated software to ea calculation and lection of correct anchor types
Main benefits
• interactive, easy to u graphical ur interface (GUI)
• time efficient, quick and easy input of virtually any slab geometry
• design calculation of each restraint tie and all supporting, horizontal
anchors
• only statically required anchors and pins are displayed • cost effective economical design
• verifiable printout with detailed
results
并肩前行
• all anchor and pin positions remain
freely adjustable
• variable wind-load input
• software takes the actual wind
宋江人物介绍loads (project-/country-specific)
into account instead of using a
standard basic method
• lower wind loads increas anchor
residual load bearing capacities
resulting in cost-effective designs
• heat transmission-value calculation
evaluates thermal bridging effects
of anchors入党的意义
• unfavourable standard DIN 4108
最后的晚餐故事calculation methods are avoided
by accurate calculation of thermal
bridges
八一文学
Contents
General 2
Anchor systems 4
Basics of design calculation 5
Overview of available anchors 6
Anchor types 8
Supporting anchors 8
Torsion anchors/Horizontal anchors 10
Restraint ties 11
Anchor calculation 12
Supporting systems 20 Fulcrum of the sandwich panels 21
Mixed systems and special solutions 22
Diagrams of supporting systems 24
Support system MVA 24
Support system MVA-FA 24
Support system FA-FA 25
Support system SPA-SPA 26 Asmbly and installation 28
Placing anchors in the face-down production process 28
Placing pins and ties 29
Placing the heat insulation layer 30
Placing anchors in the face-up production process 31
Basics 32 Production process 33
Deformation in the sandwich-panels 34
Geometric boundary conditions 36
Designing the facing layer 36
Designing the load-bearing layer 36
Designing the corner elements 36
Panel lengths 37
Further products for Sandwich panels 38 Transport anchor TPA/KKT 38天门中断楚江开
Precast panel connector HVL 39
Betojuster HBJ 39
Supporting Systems
Supporting anchors
爬虾
e page 8
Supporting anchors are primarily re-sponsible for carrying the resulting ver-tical loads from the dead load of the
facing layer. Eccentric loads (planned or unplanned) should also be taken into account, as well as ho
rizontal loads from wind, warping etc.
The torsion anchor in the MVA system has to carry any eccentric forces (planned or unplanned).
In the systems SP-FA and SP-SPA the function of the horizontal anchors is to carry horizontally acting forces (for example: from panels hanging askew on the crane, impact forces during lifting or wind forces on soffits).
R
estraint ties carry the forces acting vertically to the panel surface resulting from temperature-deformation, wind or adhesion to formwork.
Torsion anchors / Horizontal anchors e page 10
Restraint ties
e page 11
The horizontal anchors must be sufficiently dimensioned to allow for loads when panels are rotated for transport.
Sandwich panels with the MVA sup-porting system have one sleeve anchor as a supporting anchor at the centre of gravity of the facing layer and one torsion anchor. For panels with a
MVA-FA supporting system there are 2 supporting anchors (MVA and FA), the sleeve anchor rving simultaneously as a horizontal anchor. Panels with SPA-SPA and FA-FA supporting systems basically have 2 supporting anchors, i.e. anchor groups, and 1 horizontal anchor (in the ca of panels rotated for trans-porting, 2 horizontal anchors or anchor groups are usually placed).
Function of the anchors
Torsion anchor R estraint tie H orizontal anchor R estraint tie
Connector pin Clip-on stirrup
Clip-on pin
Anchor Calculation
The calculation values for the load capacities V R,d , N R,d , M R,d are resistance values taking the partial safety factors for the materials into account.
The resistance for V R,d , N R,d , M R,d need to be compared with the partial safety coefficient incread effect V E,d (vertical loads, for example dead load of the facing layer and if
required any additional loads prent), N E,d (horizontal loads, Basics
Design loads for HALFEN Software
for example from wind loads and deformation) and M E,d (only for the MVA/FA and FA/FA systems) and the specifica-tions in the appropriate approval.
The horizontal loads are mainly affected by the geometry of the slab, the raster spacing as well as the position of the anchors.ri歌词
2. Warp loads
The following influencing factors are to be taken into account to determine warping :
4. Distance from anchors to the fulcrum e
The following influencing factors are taken into account when calculating the admissible distances e :• Heat insulation thickness b
• Temperature stress according to DIBt guidelines 5/1995:Load-bearing layer temperature (internal, total year) ϑi = + 20°C Facing layer temperature in summer ϑa = + 65°C Facing layer temperature in winter ϑa = - 20°C Temperature difference
Compared to condition at installation △T = ± 45°K
• anchor arrangement in a grid with a side-ratio of 0.75 ≤ l X /l Y ≤ 1.33
• facing layer thickness f = 70 – 120 mm (further verification is necessary for thicker facing layers)
• temperature stress according to DIBt Guidelines 5/1995: temperature gradient for three-layer panel without venti-lation gap (dark surface) ΔT = ± 5°K
1. Vertical Loads
The dead-weight of the facing layer plus any existing additional loads are to be taken into account as influencing vertical loads.
3. W ind loads according to DIN EN 1991-1-4/ NA Germany for SP-FA, SP-MVA and SP-SPA
A sandwich panel with an anchor grid of max. l x × l y = 1.20 m × 1.20 m is assumed.
The wind design loads in the table [kN/m²] take the fol-lowing assumptions into account :
• simplified velocity pressure for buildings heights up to 25 m
• applicable for inland regions and wind zones 1 and 2• wind action area ≤ 1 m² (unfavourable assumption)• h/d ≥ 5 (unfavourable assumption)• …Standard region“ i ncludes zone D (for pressure) and
B (for suction)
• …Periphery region“ i ncludes zone D (for pressure) and
A (for suction)
The default wind loads in the HALFEN Calculation software
are for a building with a height ≤ 18 m in a standard region for wind zone 2 (w D,k = 0,80 and w S,k = - 0,88).
Other wind loads variables can be entered by the ur.
