1、NA to BS EN 1997-1:2004UK National Annex to Eurocode 7: Geotechnical design Part 1: General rulesICS 91.010.30NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWNATIONAL ANNEXIncorporatingCorrigendum No. 1Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 03/01/2008 08:07, Unc
2、ontrolled Copy, (c) BSIPublishing and copyright informationThe BSI copyright notice displayed in this document indicates when the document was last issued. BSI 2007ISBN 978 0 580 60946 6The following BSI references relate to the work on this standard:Committee reference B/526Draft for comment 06/301
3、16678 DCPublication historyFirst edition, November 2007Amendments issued since publicationAmd. no. Date CommentsCorrigendum No. 131 December 2007 Reference in Table NA.1 8.6(4) changed to A.8.6, last word of A.3.3.2 changed to “resistance” and Note A in Table A.NA.7 made same as Tables A.NA.6 and A.
4、NA.8.NA to BS EN 1997-1:2004Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 03/01/2008 08:07, Uncontrolled Copy, (c) BSI BSI 2007 1NA to BS EN 1997-1:2004National Annex (informative) to BS EN 1997-1:2004, Eurocode 7: Geotechnical design Part 1: General rulesIntroductionThis National Annex has
5、 been prepared by BSI Technical Committee, B/526, Geotechnics. In the UK it is to be used in conjunction with BS EN 1997-1:2004 and BS EN 1990:2002.NA.1 ScopeThis National Annex gives:a) the UK decisions for the Nationally Determined Parameters (see NA.2) described in the following subclauses in the
6、 body of BS EN 1997-1:2004:and the following subclauses in Annex A of BS EN 1997-1:2004: A.2 A.3.1, A.3.2, A.3.3.1, A.3.3.2, A.3.3.3, A.3.3.4, A.3.3.5, A.3.3.6 A.4 A.5;b) the procedure to be used where alternative procedures are given in BS EN 1997-1:2004 (see NA.2 first paragraph);c) the UK decisio
7、ns on the status of BS EN 1997-1:2004 informative annexes (see NA.3); andd) references to non-contradictory complementary information (see NA.4).2.1(8)P 2.4.7.4(3)P 7.6.2.4(4)P2.4.6.1(4)P 2.4.7.5(2)P 7.6.3.2(2)P2.4.6.2(2)P 2.4.8(2) 7.6.3.2(5)P2.4.7.1(2)P 2.4.9(1)P 7.6.3.3(3)P2.4.7.1(3) 2.5(1) 7.6.3.
8、3(4)P2.4.7.2(2)P 7.6.2.2(8)P 7.6.3.3(6)2.4.7.3.2(3)P 7.6.2.2(14)P 8.5.2(2)P2.4.7.3.3(2)P 7.6.2.3(4)P 8.5.2(3)2.4.7.3.4.1(1)P 7.6.2.3(5)P 8.6(4)11.5.1(1)PLicensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 03/01/2008 08:07, Uncontrolled Copy, (c) BSINA to BS EN 1997-1:20042 BSI 2007NA.2 Nationally
9、 Determined ParametersNational choice is permitted in the use of a Design Approach for the STR and GEO limit states (see BS EN 1997-1:2004, 2.4.7.3.4.1(1)P). As indicated in Table NA.1, only Design Approach 1 is to be used in the UK.Annex A of BS EN 1997-1:2004 lists the partial and correlation fact
10、ors for ultimate limit states; the values of these factors are nationally determined parameters. Table NA.1 of this National Annex lists the clauses in BS EN 1997-1:2004 where national choice may be exercised in respect of factor values for design in the United Kingdom. Where choice applies, Table N
11、A.1 indicates where values are given, or states a value to be used, or describes the procedure for specifying the factor. The values given in the Tables in Annex A of this National Annex replace the recommended values in Annex A of BS EN 1997-1:2004.Where reference is made in BS EN 1997-1:2004 to th
12、e use of Annex A as a guide to the required levels of safety, this reference should be taken to mean Annex A of this National Annex.BS EN 1997-1:2004 contains several references to “model factors” without making recommendations for the values to be used. Table NA.1 of this National Annex also lists
13、these references. In some cases, values of the model factors are given in A.6 of Annex A of this National Annex. Where no values are given, the values should be agreed, where appropriate, with the client and the relevant authorities. Subclauses 2.4.1(8) and 2.4.1(9) in BS EN 1997-1:2004 give guidanc
14、e on how the values of such model factors should be selected. Model factors for pile design are given in A.3.3.2 of Annex A of this National Annex.Table NA.1 Provisions of this National Annex related to Clauses in BS EN 1997-1:2004 where “national choice” is to be exercisedSubclause FeatureProvision
15、s of this National Annex2.1(8)P Minimum requirements for light and simple structures and small earthworks.Minimum requirements are not given in this National Annex and should be agreed where appropriate with the client and other relevant authorities.2.4.6.1(4)P The value of partial factor Ffor persi
16、stent and transient situations.Use the values given in A.2.1 (EQU); A.3.1 (STR/GEO); A.4.1 (UPL) and A.5 (HYD) in Annex A of this National Annex.2.4.6.1(5) Directly assessed design values for actions. Where design values of actions are assessed directly the values of the partial factors for actions
17、given in Annex A of this National Annex should be used as a guide to the required level of safety.2.4.6.2(2)P The value of partial factor Mfor persistent and transient situations.Use the values given in A.2.2 (EQU); A.3.2 (STR/GEO) and A.4.2 (UPL) in Annex A of this National Annex.2.4.6.2(3) Directl
18、y assessed design values for geotechnical parameters.Where design values of soil parameters are assessed directly, the values of the partial factors for soil parameters given in Annex A of this National Annex should be used as a guide to the required level of safety.2.4.7.1(2)P The values of partial
19、 factors to be used in persistent and transient situations.Use the values given in the appropriate tables in Annex A of this National Annex.2.4.7.1(3) The value of partial factors to be used in accidental situations.Take as equal to 1.0.Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 03/01/20
20、08 08:07, Uncontrolled Copy, (c) BSI BSI 2007 3NA to BS EN 1997-1:2004Table NA.1 Provisions of this National Annex related to Clauses in BS EN 1997-1:2004 where “national choice” is to be exercised (continued)Subclause Feature Provisions of this National Annex2.4.7.1(3) The values of partial factors
21、 for resistance. Use the values given in the appropriate tables in Annex A of this National Annex.2.4.7.1(4) The values of partial factors to be used in cases of abnormal risk or unusual or exceptionally difficult ground or loading conditions.Values are not provided in this National Annex and should
22、 be agreed with the client and relevant authorities, where appropriate, for the specific situation. 2.4.7.1(5) Reduced values of partial factors to be used for special situations for temporary structures or transient design situations, where the likely consequences justify it.Values are not provided
23、 in this National Annex and might need to be agreed with the client and relevant authorities, for the specific situation.2.4.7.1(6) Values for model factors for resistance and the effects of actions.See A.6.1 to A.6.6 of Annex A of this National Annex.2.4.7.2(2)P The values of partial factors to be
24、used in persistent and transient situations for the EQU limit state.Use the values given in A.2 in Annex A of this National Annex.2.4.7.3.2(3)P The values of partial factors to be used in equations (2.6a) and (2.6b) of BS EN 1997-1:2004 for determining the design effects for STR and GEO limit states
25、.Use the values given in A.3 in Annex A of this National Annex.2.4.7.3.3(2)P The values of partial factors to be used in equations (2.7a), (2.7b) and (2.7c) of BS EN 1997-1:2004 for determining the design resistances in the STR and GEO limit states.Use the values given in A.3.3.1, A.3.3.2, A.3.3.4,
26、A.3.3.5 and A.3.3.6 in Annex A of this National Annex.2.4.7.3.4.1(1)P The particular Design Approach to be used for the STR and GEO limit states.Use Design Approach 1 only.2.4.7.4(3)P The values of partial factors for persistent and transient situations for the UPL limit state.Use the values given i
27、n A.4 in Annex A of this National Annex.2.4.7.5(2)P The values of partial factors for persistent and transient situations for the HYD limit state.Use the values given in A.5 in Annex A of this National Annex.2.4.8(2) The values of partial factors for serviceability limit states.Take as equal to 1.0.
28、2.4.9(1)P The amounts of permitted foundation movement. Values are not provided in this National Annex. Advice is given on foundation movements for buildings in Annex H of BS EN 1997-1:2004.2.5(1) Conventional and generally conservative rules. The use of prescriptive measures for design should be ag
29、reed, where appropriate, with the client and the relevant authorities. (see 2.1(8) above).7.6.2.2(8)P The values of correlation factors 1and 2. Use the values given in A.3.3.3 of Annex A of this National Annex.7.6.2.2(14)P The values of factors b, sand t. Use the values given in A.3.3.2 of Annex A o
30、f this National Annex, depending on the type of pile.7.6.2.3(4)P The values of factors band s. Use the values given in A.3.3.2 of Annex A of this National Annex, depending on the type of pile.7.6.2.3(5)P The values of correlation factors 3and 4. Use the values given in A.3.3.3 of Annex A of this Nat
31、ional Annex.7.6.2.3(8) The value of a corrective model factor for band s.Use the values given in A.3.3.2 in Annex A of this National Annex.Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 03/01/2008 08:07, Uncontrolled Copy, (c) BSINA to BS EN 1997-1:20044 BSI 2007NA.3 Decisions on the status
32、of informative annexesNA.3.1 Annex BBS EN 1997-1:2004, Annex B may be used.BS EN 1997-1:2004, B.1(3), B.1(4) and B.1(5) and B.2(6) and B.2(7) relate to Design Approach 2 and 3 and are not therefore applicable to designs in the United Kingdom.NOTE Design resistances are expressed in three forms in BS
33、 EN 1997-1:2004, 2.4.7.3.3, namely Equations (2.7a), (2.7b) and (2.7c). Equations (2.7a) and (2.7b) are simplifications of Equation (2.7c) for the specific cases where M=1 and R= 1 respectively. The reference to Equation (2.7) in B.3(1) is strictly relevant to Equation (2.7c).Table NA.2 Provisions o
34、f this National Annex related to Clauses in BS EN 1997-1:2004 where “national choice” is to be exercised (continued)Subclause Feature Provisions of this National Annex7.6.2.4(4)P The values of factors t, 5and 6.For t, use the values given in A.3.3.2 of Annex A of this National Annex, depending on ty
35、pe of pile.For 5and 6, use the values given in A.3.3.3 of Annex A of this National Annex.7.6.3.2(2)P The value of factor s;t.Fos;t, use the values given in A.3.3.2 of Annex A of this National Annex, depending on type of pile.7.6.3.2(5)P The values of correlation factors 1and 2. Use the values given
36、in A.3.3.3 of Annex A of this National Annex.7.6.3.3(3)P The value of factor s;t.For s;t, use the values given in A.3.3.2 of Annex A of this National Annex, depending on the type of pile.7.6.3.3(4)P The values of correlation factors 3and 4. Use the values given in A.3.3.3 of Annex A of this National
37、 Annex.7.6.3.3(6) The value of a corrective model factor for s;t. Use the values given in A.3.3.2 in Annex A of this National Annex.8.5.2(2)P The value of factor a. Use the values given in A.3.3.4 of Annex A of this National Annex8.5.2(3) The value of correlation factor afor anchorages that are not
38、individually checked by acceptance tests.A value should be agreed, where appropriate, with the client and the relevant authorities.8.6(4) The value of the model factor to be applied to an anchorage force at SLS.See A.8.6 of Annex A of this National Annex.11.5.1(1)P The values of partial factors for
39、stability analysis of slopes for persistent and transient design situations.Use the values given in A.3.1, A.3.2 and A.3.3.6 in Annex A of this National Annex.Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 03/01/2008 08:07, Uncontrolled Copy, (c) BSI BSI 2007 5NA to BS EN 1997-1:2004NA.3.2 A
40、nnex CBS EN 1997-1:2004, Annex C may be used.Equations (C.1) and (C.2) do not include the effects of ground water such effects should be considered when ground water is present. The full equations are:a(z) = Kadz + q u + u cKacp(z) = Kpdz + q u + u + cKacWhere the integration is taken from ground su
41、rface to depth z andu = pore water pressure at depth zKac= 2Ka(1+a/c), limited to 2.56KaKpc= 2Kp(1+a/c), limited to 2.56KpFor drained soil, Kaand Kpare functions of angle of shearing resistance , and c = c, the effective cohesion. For undrained soil, Ka = Kp = 1 and c = cu, the undrained shear stren
42、gth.The values of Kaand Kpgiven in Figures C.1.1 to C.1.4 and Figures C.2.1 to C.2.4 relate to vertical retained faces. Where the retained face is inclined, Equations (C.6) and (C.9) should be used. The note under Equation (C.9) says the expression is on the safe side; this can be taken to mean that
43、 it over-estimates the active pressure and under-estimates the passive pressure. When active pressure is favourable and passive pressure is unfavourable the results are therefore not on the safe side.The values of Kaand Kpgiven in Figures C.1.1 to C.1.4 and Figures C.2.1 to C.2.4 are based on differ
44、ent theories from those on which Equations C.6 and C.9 are based. The two methods will therefore yield different results when $ is not equal to zero. The equations are more soundly based in theory but there is long experience of use of the graphs. They differ mainly for high values of : and $/: for
45、which it might be difficult to establish the reliability of the experience.Figure C.3 is only illustrative and values of Bpfor V/vpshould not be read from this diagram. The value of V/h for any given value of K can be interpolated from Table C.2.NA.3.3 Annex DAnnex D may be used. However, the sample
46、 method given in BS EN 1997-1:2004, Annex D omits depth and ground inclination factors which are commonly found in bearing resistance formulations. The omission of the depth factor errs on the side of safety, but the omission of the ground inclination factor does not. An alternative method to BS EN
47、1997-1:2004, Annex D, including the depth and ground inclinations as appropriate, may be used.Licensed Copy: Wang Bin, ISO/EXCHANGE CHINA STANDARDS, 03/01/2008 08:07, Uncontrolled Copy, (c) BSINA to BS EN 1997-1:20046 BSI 2007NA.3.4 Annex HBS EN 1997-1:2004, Annex H may be used.NOTE The limiting val
48、ues of structural deformation and foundation movement relate primarily to buildings. Limiting values of structural deformation and foundation movement for other civil engineering works should be determined for the project and agreed, where appropriate, with the client and other relevant authorities.
49、NA.3.5 Other AnnexesBS EN 1997-1:2004, Annex E, Annex F, Annex G and Annex J may be used.NA.4 References to non-contradictory complementary informationThe following is a list of references that contain non-contradictory complementary information for use with BS EN 1997-1:2004. BS 1377; BS 5930; BS 6031; BS 8002; BS 8004; BS 8008; BS 8081; PD 6694-11); CIRIA C580 1; UK Design Manual for Roads and Bridges 2.Design aspects of some of these, or parts of them, might be in conflict with the desi
