DMRB VOLUME 1 SECTION 3 PART 14 - Standards …

1 DESIGN MANUAL FOR ROADS AND BRIDGESSUMMARY OF CORRECTION - BD 37/01 VOLUME 1, SECTION 3, part 14 LOADS FOR HIGHWAYS BRIDGESIn August 2001, page A/46, were issued incorrectly. (Clause paragraph 2, had a typingerror in the sentence) Please remove this page and insert new one attached, dated May 2001 DESIGN MANUAL FOR ROADS AND BRIDGESVOLUME 1 HIGHWAY STRUCTURES:APPROVAL PROCEDURESAND GENERAL DESIGNSECTION 3 GENERAL DESIGNPART 1 4BD 37/01 LOADS FOR HIGHWAY BRIDGESSUMMARYThis Standard specifies the loading to be used for thedesign of highway bridges and associated structuresthrough the attached revision of Composite Version ofBS 5400: part 2. This revision to bs 5400 : part 2 alsoincludes the clauses that relate to railway bridge FOR USEThis is a revised document to be incorporated into BD 37/88, which is superseded byBD 37/01 and archive as BD 37/01 into VOLUME 1, SECTION this sheet as : A quarterly index with a full set of VolumeContents Pages is available separately from TheStationery Office Ltd.

2 BD 37/01 Loads for Highway BridgesSummary:This Standard specifies the loading to be used for the design of highwaybridges and associated structures through the attached revision of CompositeVersion of bs 5400 : part 2. This revision to bs 5400 : part 2 also includes theclauses that relate to railway bridge live MANUAL FOR ROADS AND BRIDGESTHE HIGHWAYS AGENCYSCOTTISH EXECUTIVE DEVELOPMENTDEPARTMENTTHE NATIONAL ASSEMBLY FOR WALESCYNULLIAD CENEDLAETHOL CYMRUTHE DEPARTMENT FOR REGIONAL DEVELOPMENTNORTHERN IRELANDV olume 1 SECTION 3 part 14 BD 37/01 August 2001 REGISTRATION OF AMENDMENTSA mendPage NoSignature & Date ofAmendPage NoSignature & Date ofNoincorporation ofNoincorporation ofamendmentsamendmentsRegistration of AmendmentsVolume 1 SECTION 3 part 14 BD 37/01 August 2001 REGISTRATION OF AMENDMENTSA mendPage NoSignature & Date ofAmendPage NoSignature & Date ofNoincorporation

3 OfNoincorporation ofamendmentsamendmentsRegistration of AmendmentsVOLUME 1 HIGHWAY STRUCTURES:APPROVAL PROCEDURESAND GENERAL DESIGNSECTION 3 GENERAL DESIGNPART 14BD 37/01 LOADS FOR HIGHWAY of the Composite Version of bs 5400 : part AComposite Version of bs 5400 : part 2 DESIGN MANUAL FOR ROADS AND BRIDGESA ugust 2001 VOLUME 1 SECTION 3 part 14 BD 37/01 August 20011/1 Chapter 1 Introduction1. committee CSB 59/1 reviewed bs 5400 : part 2: 1978 (including BSI Amendment No 1 (AMD4209) dated 31 March 1983) and agreed a series ofmajor amendments including the revision of the HAloading curve. It was agreed that as an interim measure,pending a long term review of bs 5400 as a whole andbearing in mind the work on Eurocodes, the series ofamendments to part 2 would be issued by theDepartment of Transport rather than by BSI.

4 Becauseof the large VOLUME of technical and editorialamendments involved it has also been decided that a fullcomposite version of bs 5400 : part 2 including all theagreed revision would be produced, forming anAppendix to the 1988 version of this the incorporation of the aboveamendments, the new load code for wind (BS 6399: part 2) has been published in the United Kingdom andfurther advances have been made in wind has led to the need to amend the Appendix to thisStandard in respect of: the United Kingdom wind map; the effect of terrain roughness on the propertiesof the wind; the effect of fetch of particular terrains on theproperties of the wind; the effects of topography on the properties of thewind; the treatment of pressure coefficients (drag andlift); and the treatment of relieving following amendments have been made to theclauses on thermal actions: additional profiles for steel plate girders andtrusses; clarification of return periods for differentialtemperatures; and minor changes to effective bridge temperaturesfor box addition, the following amendments have been made: updating certain aspects of highway bridges:- horizontal dynamic loading due to crowds onfoot/cycle track bidges;- vehicle collision loads on support andsuperstructures.

5 And updating of certain aspects of railway bridgeloading related to:- deflection limits;- use of SW/0 loading;- live load distribution by sleepers;- effects of bridges with 3 or 4 tracks;- reference to UIC documents;- limitations on applicability of dynamic factorsfor RU loading;- reference to aerodynamic effects frompassing trains; and- reference to combined response of track andstructure to longitudinal committee B525/10 has reviewed andagreed to the amendments described in 1 SECTION 3 part 14 BD 37/01 August 20012/1 Chapter 2 Scope2. Standard supersedes the previous version ofthis standard BD 37 Standard does not cover all the loadingrequirements for the assessment of existing highwaybridges and structures; additional requirements are givenin BD 21 ( dmrb ).

6 VOLUME 1 SECTION 3 part 14 BD 37/01 August 20013/1 Chapter 3 Use of the Composite Version of bs 5400 : part 23. USE OF THE COMPOSITE VERSION OF bs 5400 : part for the design of all highway bridgesbelonging to the Overseeing Organisation shall be asspecified in the full composite version of bs 5400 : Part2 in Appendix A to this loading requirements for rigid buriedconcrete box-type structures and for corrugated steelburied structures are given in BD 31 ( dmrb ) andBD 12 ( dmrb ), 1 SECTION 3 part 14 BD 37/01 August 2001 Chapter 4 Additional Requirements4/14. ADDITIONAL road bridges shall be designed to carry HAloading. In addition, a minimum of 30 units of type HBloading shall be taken for all road bridges except foraccommodation bridges which shall be designed to HAloading only.

7 The actual number of units shall berelated to the class of road as specified below:Class of road carriedNumber of units ofby structuretype HB loadingMotorways and Trunk45 Roads (or principal roadextensions of trunk routes)Principal public highway bridges where the superstructurecarries more than seven traffic lanes (ie lanes markedon the running surface and normally used by traffic),application of type HA and type HB loading shall beagreed with the Overseeing reference is made in the compositeversion of bs 5400 : part 2 to the appropriate authority ,this shall be taken to be the Overseeing Organisation,except where a reduced load factor is used forsuperimposed dead load in accordance with ofthe document, it shall be ensured that the nominalsuperimposed dead load is not exceeded during the lifeof the bridge and that a note to this effect is given in themaintenance record for the a structure is designed for a purposewhich is not specifically described in the compositeversion of bs 5400 : part 2 or in this Standard, theloading requirements must be agreed with theOverseeing Organisation and treated as an aspect notcovered by current Standards .

8 This will includestructures such as those carrying grass roads, accessways etc which may have to carry specific loading suchas that due to emergency or maintenance shall normally be designed to the loadingspecified for foot/cycle track bridges unless they haveto carry maintenance vehicles which impose a greaterloading, in which case the loading requirements must beagreed with the Overseeing determining the wind load (see of thecomposite version of bs 5400 : part 2) and temperatureeffects (see of the composite version of bs 5400 : part 2) for foot/cycle track bridges, the return periodmay be reduced from 120 years to 50 years subject tothe agreement of the Overseeing collision loads to be adopted and the safetyfence provisions at bridge supports shall be agreed withthe Overseeing Organisation.

9 Generally the headroomclearance and collision loads shall be in accordance withTD 27 ( dmrb ) and BD 60 ( dmrb ) addition to of the composite version ofBS 5400: part 2, the following conditions shall applywhen assessing structures for the effects of loadingcaused by abnormal indivisible loads (AIL);1. Wheel and axle loads shall be taken asnominal loads;2. The longitudinal load caused by braking ortraction shall be taken as whichever of thefollowing produces the most severe effect;(a) the HB traction/braking force applied inaccordance with the composite version;(b) a braking force of 15% of the gross weight ofthe AIL vehicle train distributed proportionally tothe load carried by the individual braking axles.

10 (c) a traction force of 10% of the gross weight ofthe AIL vehicle train distributed proportionally tothe load carried by the individual driving from any of the requirements given inthis Standard (including the composite version ofBS 5400: part 2) shall be agreed with the 1 SECTION 3 part 14 BD 37/01 August 2001 Chapter 5 References5/15. following documents are referred to in thepreceding sections of this Standard.(1) bs 5400 : Steel, concrete and composite bridges: part 2: 1978: Specification for loads. AmendmentNo 1, 31 March 1983.(2)BS 6399: part 2: 1997: Code of practice for windloads.(4)BD 12 ( dmrb ): Design of Corrugated Steelburied structures with spans not exceeding 8mincluding circular arches.