NA-TO-BS-EN-1996-1-1-2005.pdf
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1、NA to BS EN 1996-1-1:2005 UK National Annex to Eurocode 6: Design of masonry structures Part 1-1: General rules for reinforced and unreinforced masonry structures ICS 91.010.30; 91.080.30 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW NATIONAL ANNEX Licensed Copy: London Sout
2、h Bank University, London South Bank University, Sun Jun 17 07:20:27 GMT+00:00 2007, Uncontrolled Copy, (c) BSI Publishing and copyright information The BSI copyright notice displayed in this document indicates when the document was last issued. BSI 2007 ISBN 978 0 580 50753 3 The following BSI refe
3、rences relate to the work on this standard: Committee reference B/525/6 Draft for comment 06/30128374 DC Publication history First published May 2007 Amendments issued since publication Amd. no.DateText affected NA to BS EN 1996-1-1:2005 Licensed Copy: London South Bank University, London South Bank
4、 University, Sun Jun 17 07:20:27 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BSI 20071 NA to BS EN 1996-1-1:2005 National Annex (informative) to BS EN 1996-1-1:2005, Eurocode 6: Design of masonry structures Part 1-1: General rules for reinforced and unreinforced masonry structures Introduction This N
5、ational Annex has been prepared by BSI Subcommittee B/525/6, Use of masonry. It is to be used in conjunction with BS EN 1996-1-1:2005. NA.1 Scope This National Annex gives: a)decisions for the Nationally Determined Parameters described in the following subclauses of BS EN 1996-1-1:2005: 2.4.3(1)Pult
6、imate limit states; 2.4.4(1) serviceability limit states; 3.2.2(1) specification of masonry mortar; 3.6.1.2(1) characteristic compressive strength of masonry other than shell bedded; 3.6.2(3), (4) and (6)characteristic shear strength of masonry; 3.6.3(3) characteristic flexural strength of masonry;
7、3.7.2(2) modulus of elasticity; 3.7.4(2) creep, moisture expansion or shrinkage and thermal expansion; 4.3.3(3) and (4)reinforcing steel; 5.5.1.3(3) effective thickness of masonry walls; 6.1.2.2(2) slenderness ratio c below which creep may be ignored; 8.1.2(2) minimum thickness of wall; 8.5.2.2(2) c
8、avity walls; 8.5.2.3(2) double-leaf walls; 8.6.2(1) vertical chases and recesses; 8.6.3(1) horizontal and inclined chases. b)decisions on the status of BS EN 1996-1-1:2005 informative Annexes A to J (see NA.3); c)references to non-contradictory complementary information to assist the user to apply B
9、S EN 1996-1-1:2005 (see NA.4). Licensed Copy: London South Bank University, London South Bank University, Sun Jun 17 07:20:27 GMT+00:00 2007, Uncontrolled Copy, (c) BSI NA to BS EN 1996-1-1:2005 2 BSI 2007 NA.2 Nationally determined parameters NA.2.1Ultimate limit states see BS EN 1996-1-1, 2.4.3(1)
10、P The values for M are given in Table NA.1. Table NA.1Values of M for ultimate limit state M Class of execution control: 1 A) 2 A) Material Masonry When in a state of direct or flexural compression Unreinforced masonry made with: units of category I2,3 B)2,7 B) units of category II2,6 B)3,0 B) Reinf
11、orced masonry made with: units of category I2,0 B) C) units of category II2,3 B) C) When in a state of flexural tension units of category I and II2,3 B)2,7 B) When in a state of shear Unreinforced masonry made with: units of category I and II2,5 B)2,5 B) Reinforced masonry made with: units of catego
12、ry I and II2,0 B) C) Steel and other components Anchorage of reinforcing steel1,5 D) C) Reinforcing steel and prestressing steel1,15 D) C) Ancillary components wall ties3,5 B)3,5 B) Ancillary components straps1,5 E)1,5 E) Lintels in accordance with BS EN 845-2See NA to BS EN 845-2See NA to BS EN 845
13、-2 A) Class 1 of execution control should be assumed whenever the work is carried out following the recommendations for workmanship in BS EN 1996-2, including appropriate supervision and inspection, and in addition: a)the specification, supervision and control ensure that the construction is compati
14、ble with the use of the appropriate partial safety factors given in BS EN 1996-1-1; b)the mortar conforms to BS EN 998-2, if it is factory made mortar, or if it is site mixed mortar, preliminary compression strength tests carried out on the mortar to be used, in accordance with BS EN 1015-2 and BS E
15、N 1015-11, indicate conformity to the strength requirements given in BS EN 1996-1-1 and regular testing of the mortar used on site, in accordance with BS EN 1015-2 and BS EN 1015-11, shows that the strength requirements of BS EN 1996-1-1 are being maintained. Class 2 of execution control should be a
16、ssumed whenever the work is carried out following the recommendations for workmanship in BS EN 1996-2, including appropriate supervision. B) When considering the effects of misuse or accident these values may be halved. C) Class 2 of execution control is not considered appropriate for reinforced mas
17、onry and should not be used. However, masonry wall panels reinforced with bed joint reinforcement used: a)to enhance the lateral strength of the masonry panel; b)to limit or control shrinkage or expansion of the masonry, can be considered to be unreinforced masonry for the purpose of class of execut
18、ion control and the unreinforced masonry direct or flexural compression M values are appropriate for use. D) When considering the effects of misuse or accident these values should be taken as 1,0. E) For horizontal restraint straps, unless otherwise specified, the declared ultimate load capacity dep
19、ends on there being a design compressive stress in the masonry of at least 0,4 N/mm2. When a lower stress due to design loads may be acting, for example when autoclaved aerated concrete or lightweight aggregate concrete masonry is used, the manufacturers advice should be sought and a partial safety
20、factor of 3 should be used. Licensed Copy: London South Bank University, London South Bank University, Sun Jun 17 07:20:27 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BSI 20073 NA to BS EN 1996-1-1:2005 NA.2.2Serviceability limit states see BS EN 1996-1-1, 2.4.4(1) The recommended value for M for all
21、 of the materials listed in Table NA.1 is 1,0. NA.2.3Specification of masonry mortar see BS EN 1996-1-1, 3.2.2(1) NA.2.3.1Mortars The proportions of the prescribed constituents required to provide the stated “M” values for prescribed masonry mortars are given in Table NA.2. Table NA.2Acceptable assu
22、med equivalent mixes for prescribed masonry mortars Compressive strength class A) Prescribed mortars (proportion of materials by volume) (see Note)Mortar designation Cement B) : lime : sand with or without air entrainment Cement B) : sand with or without air entrainment Masonry cement C) : sand Maso
23、nry cement D) : sand M121 : 0 to : 31 : 3Not suitableNot suitable(i) M61 : : 4 to 41 : 3 to 41 : 2 to 31 : 3(ii) M41 : 1 : 5 to 61 : 5 to 61 : 4 to 51 : 3 to 4(iii) M21 : 2 : 8 to 91 : 7 to 81 : 5 to 61 : 4(iv) A) The number following the M is the compressive strength for the class at 28 days in N/m
24、m2 B) Cement or combinations of cement in accordance with NA.2.3.2, except masonry cements C) Masonry cement in accordance with NA.2.3.2 (inorganic filler other than lime) D) Masonry cement in accordance with NA.2.3.2 (lime) NOTE When the sand portion is given as, for example, 5 to 6, the lower figu
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