MULTI-MONTI®-plusExpert Opinion Nr. 19-048for the bearing capacity of the concrete screw HECO MULTI-MONTI MMS-plus for redundant non-structural systems in hollow core slabs

ISB Block und Becker Beratende Ingenieure PartGmbB

ISB Block und Becker Beratende Ingenieure PartGmbB Telefon +49 (0) 231 – 137276 50 Edelstahlweg 5c, 44287 Dortmund Mail rainer.becker@isb-ing.de

Applicant

HECO-Schrauben GmbH & Co. KG Dr.-Kurt-Steim-Str. 28

78713 Schramberg

THIS REPORT CONTAINS 4 PAGES OF TEXT INCLUDING ANNEXES.

THE REPORTED TEST RESULTS RELATE ONLY TO THE TESTED ITEMS. LIABILITY FOR ANY CONCLUSIONS OR GENERALISATIONS BASED

ON THESE TEST RESULTS ARE EXCLUDED.

FOR ANY COPYING, PUBLICATION, THE USE FOR ADVERTISING PURPOSES OR REFERENCE TO THE REPORT – EVEN IN EXTRACTS – A

WRITTEN AUTHORIZATION OF THE ISB BLOCK UND BECKER BERATENDE INGENIEURE PARTGMBB IS REQUIRED.

27. April 2020

Expert Opinion No. 19-048 for the bearing capacity of the concrete screw HECO Multi-Monti MMS-plus for redundant non-structural systems in hollow core slabs

ISB Block und Becker Beratende Ingenieure PartGmbB

ISB Block und Becker Beratende Ingenieure PartGmbB Telefon +49 (0) 231 – 137276 50 Edelstahlweg 5c, 44287 Dortmund Mail rainer.becker@isb-ing.de

Applicant

HECO-Schrauben GmbH & Co. KG Dr.-Kurt-Steim-Str. 28

78713 Schramberg

THIS REPORT CONTAINS 4 PAGES OF TEXT INCLUDING ANNEXES.

THE REPORTED TEST RESULTS RELATE ONLY TO THE TESTED ITEMS. LIABILITY FOR ANY CONCLUSIONS OR GENERALISATIONS BASED

ON THESE TEST RESULTS ARE EXCLUDED.

FOR ANY COPYING, PUBLICATION, THE USE FOR ADVERTISING PURPOSES OR REFERENCE TO THE REPORT – EVEN IN EXTRACTS – A

WRITTEN AUTHORIZATION OF THE ISB BLOCK UND BECKER BERATENDE INGENIEURE PARTGMBB IS REQUIRED.

27. April 2020

Expert Opinion No. 19-048 for the bearing capacity of the concrete screw HECO Multi-Monti MMS-plus for redundant non-structural systems in hollow core slabs

ISB Block und Becker Beratende Ingenieure PartGmbB Expert Opinion Seite 2 von 4 19-048 – HECO MMS-plus in hollow core slabs 27. April 2020

Table of contents

1 General ................................................................................................................................ 3

2 Screws and Basic Conditions ............................................................................................... 3

3 Bearing Capacities and Notes .............................................................................................. 4

Quellen

[1] EOTA EAD 330747-00-0601: European Assessment Document – Fasteners for use in concrete for redundant non-structural systems, May 2018

[2] EOTA ETAG 001: Guideline for European technical approval of metal anchors for use in concrete, Part 6: Anchors for multiple use for non-structural applications, amended version January 2011

[3] DIBt ETA-15/0784: MULTI-MONTI-plus – Screw anchor of sizes 6, 7.5, 10, 12, 16 and 20 mm for installation in cracked and uncracked concrete, 23. April 2018

[4] DIN DIN EN 1992-4: Eurocode 2 – Design of concrete structures – Part 4: Design of fastenings for use in concrete; German version EN 1992-4:2018

[5] Becker, R., Hagemann, T.: Untersuchungsbericht Nr. P14-033B-U2 zum Tragverhalten der Betonschraube HECO MULTI-MONTI® MMS-plus in dünnen Bauteilen – „COBIAX Deckensystemen“ in Anlehnung an ETAG 001, Dortmund August 2017

[6] Becker, R., Kramer, N., Hagemann, T.: Evaluation Report No. P14-033B-E – Concrete screw for multiple use for non-structural applications in prestressed hollow core slabs and hollow core slabs, Dortmund August 2017

[7] DIBt Z-15.1-282: Hohlkörperdecke System “COBIAX”, 19.01.2016

[8] DIBt Z-15.1-307: Hohlkörperdecke System “COBIAX SLIM LINE”, 23.11.2018

ISB Block und Becker Beratende Ingenieure PartGmbB Expert Opinion Seite 3 von 4 19-048 – HECO MMS-plus in hollow core slabs 27. April 2020

1 General The company HECO-Schrauben GmbH & Co. KG ordered an expert opinion at the ISB Block und Becker for determination of the bearing capacity of the concrete screw HECO Multi-Monti MMS-plus in the hollow core slab systems "COBIAX" Z-15.1-282 [7] and "COBIAX SLIM-LINE" Z-15.1-307 [8].

This expert opinion is based on test results which were gathered in hollow core slabs (i.e. ‘Cobiax’) are already documented in [5] and evaluated in [6].

The tests on galvanized screws MMS-plus of sizes 6, 7,5 and 10 were conducted at the laboratory of the fobatec GmbH acc. to ETAG 001, part 6 [2] using a crack width of w = 0,35 mm. The concrete specimens were casted especially for these tests with a thickness of 50 mm.

2 Screws and Basic Conditions Within this expert opinion only sizes 6, 7.5 and 10 of the already approved screws MMS-plus are assessed.

The manufacturers installation instruction and the specifications of the concerning ETA -15/0784 [3] have to be regarded.

Table 2.1 Installation Parameter MULTI-MONTI-plus Screw MMS-plus 6 MMS-plus 7,5 MMS-plus 10

gvz gvz gvz Nominal diameter of drill bit d0 [mm] 5,0 6,0 8,0 Cutting diameter of drill bit dcut ≤ [mm] 5,40 6,40 8,45 Depth of the drill hole h1 ≥ [mm] 55 65 75 Nominal embedment depth hnom [mm] 45 55 65 Diameter of the fixture hole df [mm] 7,0 9,0 12,0

ISB Block und Becker Beratende Ingenieure PartGmbB Expert Opinion Seite 3 von 4 19-048 – HECO MMS-plus in hollow core slabs 27. April 2020

1 General The company HECO-Schrauben GmbH & Co. KG ordered an expert opinion at the ISB Block und Becker for determination of the bearing capacity of the concrete screw HECO Multi-Monti MMS-plus in the hollow core slab systems "COBIAX" Z-15.1-282 [7] and "COBIAX SLIM-LINE" Z-15.1-307 [8].

This expert opinion is based on test results which were gathered in hollow core slabs (i.e. ‘Cobiax’) are already documented in [5] and evaluated in [6].

The tests on galvanized screws MMS-plus of sizes 6, 7,5 and 10 were conducted at the laboratory of the fobatec GmbH acc. to ETAG 001, part 6 [2] using a crack width of w = 0,35 mm. The concrete specimens were casted especially for these tests with a thickness of 50 mm.

2 Screws and Basic Conditions Within this expert opinion only sizes 6, 7.5 and 10 of the already approved screws MMS-plus are assessed.

The manufacturers installation instruction and the specifications of the concerning ETA -15/0784 [3] have to be regarded.

Table 2.1 Installation Parameter MULTI-MONTI-plus Screw MMS-plus 6 MMS-plus 7,5 MMS-plus 10

gvz gvz gvz Nominal diameter of drill bit d0 [mm] 5,0 6,0 8,0 Cutting diameter of drill bit dcut ≤ [mm] 5,40 6,40 8,45 Depth of the drill hole h1 ≥ [mm] 55 65 75 Nominal embedment depth hnom [mm] 45 55 65 Diameter of the fixture hole df [mm] 7,0 9,0 12,0

ISB Block und Becker Beratende Ingenieure PartGmbB Expert Opinion Seite 4 von 4 19-048 – HECO MMS-plus in hollow core slabs 27. April 2020

3 Bearing Capacities and Notes The following bearing capacities can be determined from the tests described in [5]. These bearing capacities are valid for thin, cracked hollow core concrete members at a minimum compressive strength class C20/25.

Table 3.1 Characteristic bearing capacity in cracked hollow core concrete members

HECO MMS-plus Thickness

of skin [mm]

MMS-6 gvz

MMS-7,5 gvz

MMS-10 gvz

≥ C

20/2

5 hnom [mm] 45 55 65

hef,11) [mm] 35 43 50

NRk,p,cr [kN] ≥ 50 3.40 3.53 3.78 1) acc. to [1, chapter 1.3.4, Figure 1.14] with ℎ𝑒𝑒𝑒𝑒 = 0.85(ℎ𝑛𝑛𝑛𝑛𝑛𝑛 − 0,5ℎ𝑡𝑡 − ℎ𝑠𝑠) ≤ 8𝑑𝑑0

The characteristic bearing capacities mentioned in Table 3.1 do not regard any safety factor neither for the material nor for the actions. Safety factors have to be regarded acc. to ETA-15/0784 [3] or EN 1992-4 [4].

The bearing capacities are only valid for skin thicknesses ≥ 50 mm and concrete strength classes ≥ C20/25. Increasing factors concerning a higher concrete compressive strength must not be used.

Installation in hollow core slabs has to be conducted by hand or by rotary drilling only. The influence of the usage of impact screw drivers was not investigated. A turn-through of the concrete screw has to be avoided, otherwise the screw does not bear the load.

Forwarding of the action on the screw into the hollow core slab is not the topic of this expert opinion. Only the direct load introduction into the concrete slab is covered by this expert opinion.

Dortmund, 27. April 2020

Rainer Becker

HECO-Schrauben GmbH & Co.KG Dr.-Kurt-Steim-Straße 28 · D-78713 Schramberg

Tel.: +49 (0) 74 22 / 9 89-0 · Fax: +49 (0) 74 22 / 9 89-200 Mail: info@heco-schrauben.de · www.heco-schrauben.de XX

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