Bsi bs en 01737 1998 (1999)

01438357 PDF BRITISH STANDARD BS EN 1737 1998 Determination of shear strength of welded joints of reinforcement mats or cages for prefabricated components made of autoclaved aerated concrete or lightw[.]

BRITISH STANDARD BS EN

1737:1998

Determination of shear

strength of welded

joints of reinforcement

mats or cages for

prefabricated

components made of

autoclaved aerated

concrete or lightweight

aggregate concrete

with open structure

The European Standard EN 1737:1998 has the status of a

British Standard

ICS 91.100.30

BS EN 1737:1998

This British Standard, having

been prepared under the

direction of the Sector Board for

Building and Civil Engineering,

was published under the

authority of the Standards

Board and comes

into effect on

15 November 1998

© BSI 05-1999

ISBN 0 580 30100 1

National foreword

This British Standard is the English language version of EN 1737:1998 The UK participation in its preparation was entrusted to Technical Committee B/523, Prefabricated components of reinforced autoclaved aerated concrete and lightweight aggregated concrete with open structure, which has the

responsibility to:

— aid enquirers to understand the text;

— present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed;

— monitor related international and European developments and promulgate them in the UK

A list of organizations represented on this committee can be obtained on request to its secretary

Cross-references

The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic

Catalogue

A British Standard does not purport to include all the necessary provisions of

a contract Users of British Standards are responsible for their correct application

Compliance with a British Standard does not of itself confer immunity from legal obligations.

Summary of pages

This document comprises a front cover, an inside front cover, pages i and ii, the EN title page, pages 2 to 6 and a back cover

This standard has been updated (see copyright date) and may have had amendments incorporated This will be indicated in the amendment table on the inside front cover

Amendments issued since publication

Amd No Date Comments

BS EN 1737:1998

Contents

Page

ii blank

EUROPEAN STANDARD

NORME EUROPÉENNE

EUROPÄISCHE NORM

EN 1737 April 1998

ICS

Descriptors: Concrete, cellular concrete, aggregates, reinforcing materials, prefabricated elements, welded wire lattice, mechanical

tests, shear tests, determination, shear strength, test specimen

English version

Determination of shear strength of welded joints of reinforcement mats or cages for prefabricated

components made of autoclaved aerated concrete

or lightweight aggregate concrete with open structure

Détermination de la résistance au cisaillement

des jonctions soudées des treillis ou corbeilles

d’armatures pour les éléments préfabriqués

réalisés en béton cellulaire autoclavé ou en

béton de granulats légers à structure ouverte

Bestimmung der Bruchscherkraft von Schweißknoten von Betonstahlmatten oder Bewehrungskörben für vorgefertigte Bauteile aus dampfgehärtetem Porenbeton oder haufwerksporigem Leichtbeton

This European Standard was approved by CEN on 25 March 1998

CEN members are bound to comply with the CEN/CENELEC Internal

Regulations which stipulate the conditions for giving this European Standard

the status of a national standard without any alteration Up-to-date lists and

bibliographical references concerning such national standards may be obtained

on application to the Central Secretariat or to any CEN member

This European Standard exists in three official versions (English, French,

German) A version in any other language made by translation under the

responsibility of a CEN member into its own language and notified to the

Central Secretariat has the same status as the official versions

CEN members are the national standards bodies of Austria, Belgium,

Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland,

Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden,

Switzerland and United Kingdom

CEN

European Committee for Standardization Comité Européen de Normalisation Europäisches Komitee für Normung

Central Secretariat: rue de Stassart 36, B-1050 Brussels

© 1998 CEN All rights of exploitation in any form and by any means reserved worldwide for

EN 1737:1998

© BSI 05-1999

2

Foreword

This European Standard has been prepared by

Technical Committee CEN/TC 177, Prefabricated

reinforced components of autoclaved aerated

concrete or lightweight aggregate concrete with

open structure, the secretariat of which is held

by DIN

In order to meet the performance requirements as

laid down in the product standards for prefabricated

components of autoclaved aerated concrete and of

lightweight aggregate concrete with open structure,

a number of standardized test methods are

necessary

This European Standard shall be given the status of

a national standard, either by publication of an

identical text or by endorsement, at the latest by

October 1998, and conflicting national standards

shall be withdrawn at the latest by October 1998

According to the CEN/CENELEC Internal

Regulations, the national standards organizations

of the following countries are bound to implement

this European Standard: Austria, Belgium,

Czech Republic, Denmark, Finland, France,

Germany, Greece, Iceland, Ireland, Italy,

Luxembourg, Netherlands, Norway, Portugal,

Spain, Sweden, Switzerland and the United

Kingdom

Contents

Page

Figure 1 — Typical device for testing shear strength of welded joints 4 Figure 2 — Typical auxiliary device for

testing of joints with a diagonal bar 5 Figure 3 — Shape and dimensions of

test specimens with welded

Figure 4 — Shape and dimensions of test specimens with welded diagonal bars 6

EN 1737:1998

1 Scope

This European Standard specifies a method of

determining the shear strength of welded joints in

reinforcements intended for use in prefabricated

components made of autoclaved aerated concrete

(AAC) according to prEN 12602 or lightweight

aggregate concrete with open structure (LAC)

according to prEN 1520

2 Normative references

This European Standard incorporates by dated or

undated reference, provisions from other

publications These normative references are cited

at the appropriate places in the text, and the

publications are listed hereafter

For dated references, subsequent amendments to or

revisions of any of these publications apply to this

European Standard only when incorporated in it by

amendment or revision For undated references the

latest edition of the publication referred to applies

prEN 1520, Prefabricated components of lightweight

aggregate concrete with open structure

prEN 12602, Prefabricated reinforced components of

autoclaved aerated concrete

3 Principle

The shear strength of welded joints is determined on

test specimens consisting of a longitudinal bar and

a welded transverse bar or diagonal bar

In the case of welded joints, where the transverse

bar forms an angle of 90° with the longitudinal bar,

the test load is applied as a tensile force on the free

end of the longitudinal bar, while the welded

transverse bar is supported by a device designed to

minimize influence from bending and twisting

forces (see note 1)

When joints with a diagonal bar are tested, the test

load is applied to the free end of the diagonal bar

while the longitudinal bar is supported (see note 2)

The test load is increased at a uniform rate until

failure of the weld, and the ultimate force is

recorded

NOTE 1 In AAC- and LAC-components transverse bars are

predominantly used for anchorage of longitudinal bars, therefore

the tensile force which can be transmitted from the longitudinal

bar to the transverse bar, is of main interest.

NOTE 2 Diagonal bars are mainly used as shear reinforcement

In this case, the welded joint should be able to transmit the

tensile force of the diagonal bar to the longitudinal bar.

4 Apparatus

a) a device for cutting reinforcement without

influence on the welded joints;

b) calipers, capable of measuring the diameter of

the reinforcing bars and the dimension of the welded joint to an accuracy of 0,1 mm;

c) a tensile testing machine having a load capacity

of at least 20 kN, capable of measuring the load to

an accuracy of 1 %; for routine control purposes machines with lower accuracy may be used, provided the actual accuracy is taken into consideration when evaluating the test results

d) a device capable of holding the test specimen in

such a way that the non-tensioned bar is firmly supported and prevented from bending and twisting as far as possible The free end of the tensioned bar shall be supported against bending

in such a way, that the measured force is not increased by friction (see note)

NOTE A typical device is shown in Figure 1 An auxiliary for testing welded joints with angles other than 90° between the bars

is shown in Figure 2.

5 Test specimens

5.1 Sample

The sample for the preparation of the test specimens (usually reinforcement mats or cages) shall be taken

in such a manner that it is representative of the entire output of the welding equipment used for the manufacture of the prefabricated components The sampling shall be adjusted to the type of welding machine used if any knowledge exists The sample shall include welded joints from every longitudinal bar and from different transverse (or diagonal) bars in sufficient number to satisfy the

requirements in 5.3.

5.2 Shape and size of test specimens

The test specimen consists of a longitudinal bar and

a welded transverse bar or diagonal bar with dimensions according to Figure 3 or Figure 4, respectively, if possible If test specimens with other shapes or sizes are used, this shall be indicated in the test report

5.3 Number of test specimens

A test set shall include at least one test specimen from each longitudinal bar, but not less than three test specimens

5.4 Preparation of test specimens

Test specimens shall be cut in such a manner as to avoid damage to the welds Burrs and other irregularities should be removed from the bar ends

5.5 Measurement of test specimens

The diameter of both bars shall be measured to an accuracy of 0,1 mm, using calipers

EN 1737:1998

5.6 Conditioning of test specimens

The test specimens shall be in equilibrium with a

room temperature between (10 – 30) °C when being

tested

6 Testing procedure

The test specimen shall be centred in the testing

device so that the axis of the bar to be tensioned

coincides with the axis of the device The supported

welded bar shall be held in a way that bending as

well as twisting is prevented The tension force shall

be applied on the bar to be anchored by the welded

bar in the prefabricated component Normally the

longitudinal bar shall be loaded However, when

testing the welded joint between a longitudinal bar

and a bar used for shear reinforcement, the tensile

force shall be applied on the latter The free end of

the tensioned bar shall be supported in a way

(e.g by means of rollers) that friction does not

influence the test result

The load shall be applied at a uniform rate so that the stress increase in the tensioned bar does not exceed 5 N/mm2·s The load shall be increased until failure of the welded joint or of the bar In both cases this load shall be indicated as failure load

7 Test results

The shear strength is defined as the ultimate shear force which is equivalent to the ultimate tensile force in the tensioned bar The individual values and the mean value shall be rounded to the nearest 0,1 kN

Figure 1 — Typical device for testing shear strength of welded joints

EN 1737:1998

Figure 2 — Typical auxiliary device for testing of joints with a diagonal bar

EN 1737:1998

8 Test report

The test report shall include the following:

a) identification of the product;

b) date of manufacture or other code;

c) place and date of testing, testing institute and person responsible for testing;

d) number and date of issue of this European Standard;

e) identification of welding procedure;

f) type of weld;

g) angle between the bars;

h) nominal diameter of both bars;

i) indication on which of the two bars the test load has been applied;

j) type of steel (plain smooth or ribbed, steel quality if available);

k) measured diameters of both bars of all test specimens and (optional) overall thickness of the welded joint;

l) shear strength of individual test specimens and mean value;

m) failure mode (only for failure outside the welded joint);

n) observed inclusions, impurities or other irregularities;

o) (if appropriate) deviations from the standard method of testing;

p) a declaration that the testing has been carried out in accordance with this European Standard

except as detailed in 8 o).

If available, the following information (e.g collected at inspection of welding equipment) shall be added:

q) type of welding machine;

r) number of welding guns when more than one; s) settings:

— welding time;

— current intensity;

— cooling time;

— electrode pressure;

t) position of weld in the reinforcement mat or cage (drawing)

Figure 3 — Shape and dimensions of test

specimens with welded transverse bars

Figure 4 — Shape and dimensions of test

specimens with welded diagonal bars

blank

BS EN

1737:1998

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