Stud Connector
20Pages

HALFEN HSC STUD CONNECTOR ! NEW with RAL-Quality Mark • RAL-GZ 658/2 • approval acc. to Eurocode 2 • extended range, now with 12 mm bar diameter • beam and slab supports approved by Z-21.8-1973

Highly effective reinforcement anchor The HALFEN HSC Stud Connector is an officially approved reinforcement anchor, optimised for anchorage in concrete. Full reinforcement anchorage can be achieved with minimum transmission lengths. The HALFEN HSC Stud connector is especially suitable for use in highly reinforced areas such as corbels and beam to column connections. The problems that occur in the layout of reinforcement and distribution of forces with conventional rebar solutions do not apply. The amount of reinforcement steel is considerably reduced and the reinforcement layout is simpler....

Simple reinforcement layout Comparison of anchor lengths Extremely short anchorage lengths Straight reinforcement Bent reinforcement Corbel with HALFEN HSC Stud connector: secure anchorage, simple reinforcement layout HALFEN HSC Stud connector Conventional corbel reinforcement with large bending diameters, high steel usage and complicated reinforcement Advantages in planning and design Wide application range • Approval for predominantly static and non-predominantly static loading cases • approved for predominantly static and non-predominantly static loads • standard-anchors available from...

Frame corners → page 6 Half joints Slab supports → page 11 Frame corners exposed to positive bending moments Beam supports → page 11 Examples of corbel application HSC-SD Nailing plate HSC-A Corbel with multilayer reinforcement in monolithic element → page 16 Option 1 : keyed joint acc. to EN 1992-1-1 Option 2: simplified keyed joint Corbel with single layer reinforcement used in concrete sections → page 16 © 2012 HALFEN · HSC 13-E · www.halfen.com

H A L F E N H S C S T U D CO N N E C TO R Design and Dimensioning, Basics Application according to approval Z-21.8-1973 Fatigue resistance values of HSC Stud connectors: • normal-weight concrete, strength classes C20/25 up to C70/85 • HSC: B500B • stress ranges for N = 2·106 : ΔσRSK = 80 N/mm² for dHSC = 12 mm, dHSC = 16 mm and dHSC = 20 mm ΔσRSK = 70 N/mm² for dHSC = 25 mm Stresses and resistances • predominantly static and non-predominantly static loads • yield strength: • Wöhlerline stress exponents: k1 = 3.5 for N ≤ 2·106 k1 = 3 for 2·106 ≤ N ≤ 107 k2 = 5 Design concepts and regulations...

H A L F E N H S C S T U D CO N N E C TO R Design and Dimensioning of Frame Corners, Construction Specifications Frame corner according to approval Z-21.8-1973 Figure 1 : Strut and tie model Stirrup reinforcement Beam and column have to be reinforced with stirrups with length hcol / hbeam, measured from the joint cross sections, with a maximum spacing of s = 10 cm. See figure 2 below: “minimal stirrup reinforcement”. Shear resistance VEd,col,o Applied shear force Vjh: Vjh = As,HSC ⋅ fyd − VEd,col,o hbeam Limitation of the shear force Vjh to Vjh ≤ Vj,Rd Vj,Rd,max Node resistance Vj,cd without...

H A L F E N H S C S T U D CO N N E C TO R Design and Dimensioning of Frame Corners and Corbels, Construction Specifications Minimum dimensions Anchor diameter dHSC [mm] 12 Quasi-permanent normal column force NEd,col = 1.0 ⋅ NG + 0.3 ⋅ ∑ NQ (Compression force negative) Shear joint The shear joint has to be verified if the column and beam are concreted in two segments → page 10. Concrete strength class Corbels according to approval Z-21.8-1973 HALFEN HSC Stud connectors in this application are calculated using the same basic method as for conventional reinforcement. The calculation method is...

H A L F E N H S C S T U D CO N N E C TO R Design and Dimensioning of Corbels, Construction Specifications Corbels according to approval Z-21.8-1973 Deviating from the standard layout, HSC can be placed multilayered or staggered, corbel dimensions can also be below minimum given values. In these cases further calculations are required; see approval. Further verifications and regulations The transfer of forces to the column in single corbels can be verified using the same design rules as used for frame corners → see page 6. Proof of the compressive stress of concrete on the bearing plate is...

H A L F E N H S C S T U D CO N N E C TO R Design and Dimensioning of Corbels, Construction Specifications Corbels according to approval Z-21.8-1973 Stirrups for transverse tensile forces At least one closed vertical stirrup for transverse tensile forces has to be installed inside the load area for each rebar layer. Correct placement is between the middle of the bearing plate and the HSC anchor heads (see figure). Stirrup diameter is according to the table on page 8. Short corbels (ac ≤ 0.5 hc) Option 1: continuous tensile splitting reinforcement Stirrup area Option 1: Closed horizontal or...

H A L F E N H S C S T U D CO N N E C TO R Shear Joint Design and Dimensioning Shear joints according to approval Z-21.8-1973 The shear joint can be configured either as a key joint or as simplified key joint, see illustrations. The distance between the joints must not be smaller than the largest possible size of aggregate in the concrete mix. Proof of the shear joint VEd ≤ VRdj = cj ⋅ fctd ⋅ bc ⋅ xj + 1.2 ⋅ μ ⋅ Asj ⋅ fyd ≤ VRdj,max with: hc – u ≤ 500 mm for simple key joint without longitudinal tensile force (HEd ≤ 0) xc – u ≤ 500 mm for simple key joint with longitudinal tensile force (HEd...

H A L F E N H S C S T U D CO N N E C TO R End Anchorage in Beams and Slabs Beam supports and slab supports according to approval Z-21.8-1973 with: σ* = allowable compression at calculated bearing, compare to figure. ü = head overlap hHSC → Table page 8 Bearing area of beams: At least one closed vertical stirrup for each layer of reinforcement HSC at the anchor head, minimum diameter dsw according to table → page 8 Concrete cover; head extension, vertical section The transverse reinforcement has to be calculated according to DIN EN 1992-1-1, valid for VRd,max : VRd,max = 0.5 ⋅ ν ⋅ b ⋅ z ⋅...