El Dabasin Overpass Design Statement

KHA TOU MINIST Y OF

STATE LAN ING

AN URB N DE ELO MENT

EL-DAB SIN

VE PAS

DESIGN ST TEME T By

SPAN FOR CON ULTANCY ENGINEERIN

Khartoum, Sudan

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Document Issue Record

Project: EL-DABASIN OVERPASS Report Title: DESIGN STATEMENT Revision: A

A

15.09.10

Rev Rev

Date Date

For Approval

Description Description and Purpose of Issue

MH

Prepare Prepared d

EK Reviewed eviewed

EK Approved





SPAN FOR CONSULTANCY ENGINEERING EL‐DABASIN OVERPASS Design Statement

Rev: A Date: 15 September 2010

1. INTRODUCTION This Design Statement describes the basic design assumptions which will be used for the design of El-dabasin overpass.

2. HIGHWAY DETAILS 2.1.

Type of Highway The bridge will provide an overpass at El-dabsin bridge interchange.

2.2.

Road Cross Section The road cross section comprises a d ual two lane highway with overall width between kerbs of 24.10m divided by a 1.20m median into two 11.45m 11.45m carriageways.

2.3.

Permitted Traffic Speed The design speed for the highway is 80 kph and this will be taken as the maximum permitted speed for the road.

3. PROPOSED STRUCTURE 3.1.

Descripti Descripti on of Structure The structure will comprise a 0.80m thick. Voided slab, two spans integral bridge of 15.84m clear span each. The road will be surfaced with 60mm asphalt Outline general arrangement drawings are presented in Appendix A.






3.2.


Materials and Finishes Construction materials will be confirmed during detailed design stage to satisfy the design life of the bridge taking into account locally available materials, environmental conditions, ground and water chemical composition and cover to concrete. Anticipated concrete grades are as follows: Class C12.5/15 Class C30/35

Plain concrete Slabs ,Walls and Pier

The concrete road deck surface will b e finished with 60mm of asphalt su rfacing. .

Reinforcement: Reinforcement is to be Grade 460, Type 2, high yield deformed bars To BS44492

1997 with a minimum yield strength, fy = 460 N/mm .

Structural Steel: All steels shall comply with the requirements requirements of BS EN EN 10025:1993, BS EN 10277:1999, BSEN 10278:1999, BS 3100:1991, BS EN 10113:1993, BS 4190:2001, BS 3692:2001, BS4395:1969, BS 4604:1970 and cross referenced Standards therein. The quality records of the plant(s) manufacturing steels and products shall be provided together with other supporting information to show that the proposed steel maker produces steel and products to the required quality.







4. DESIGN CRITERIA 4.1.

Design Design Life and Serviceability The design life of the bridge will be 120 years.

4.2.

Highway Clearances A 5.20m clear height will will be provided under the bridge. .

4.3.

Highway Loading Highway live loading will be in accordance with BS 5400-2: 1978, as implemented by UK DTp Document BD37/01 as follows: Full HA 37.5 Units HB Live load surcharge on the fill material behind abutments will be as follows: 2

10.0 kN/m 2 12.5 kN/m

4.4.

HA HB

Pedestrian Pedestrian Lo ading Pedestrian loading will in accordance with BS 5400 - 2: 1978, as i mplemented by UK DTp Document BD37/01, Clauses 6.5.1.1 and 6.5.1.2. The basic load 2 intensity will be 5.0kN/m .

4.5.

Wind Loading Wind loading will be taken as follows: Bridge without live load: 2

3.0 kN/m Pressure on windward side. 2 1.5 kN/m Suction on leeward side

Bridge with live load: 2

1.5 kN/m Pressure on windward side 2

0.75 kN/m Suction on leeward side







The live load will be assumed to be 2.5m high above finished road level and the wind load on it will be applied at 1.5m above finished road level.

4.6.

Temperature Loading

Temperature loading will be generally i n accordance with BS5400 Part 2:1978, as implemented by UK DTp Document BD37/01, except that effective bridge temperatures for structural design shall be taken as foll ows: The minimum effective bridge temperature will be taken as 5°C The maximum effective bridge temperature will be taken as 50°C These temperatures are deemed to be appropriate for the 120 year design life adopted for the structural design.

4.7.

Bridge Lighting The design of the bridge will make provision for fixing street lighting as appropriate. .

4.8.

Drainage

The design of the of the bridge will make provision for fixing PVC pipes as appropriate.

5. GROUND CONDITIONS 5.1.

Ground Conditions Ground conditions are to be confirmed following completion of the ground investigation.

5.2.

Differential Settlements Vertical differential settlements will be taken as ±10mm at any foundation , relative to its adjacent foundations.









6. CODES AND STANDARDS The following Codes and Standards will be used:

6.1.

Am eri can Stan dar ds rd

AASHTO LRFD Bridge Design Specifications, 3 Edition, 2005 SI.

6.2.

British Standards BS 5400: Steel, concrete and composite bridges Part 1:1988 General Statement Part 2:1978 Specification for loads Part 4:1990 CP for design of concrete bridges Part 9:1983 CP for design of bridge bearings BS 6779: Highway parapets for bridges and other structures Part 2:1991 Specification for vehicle containment parapets of concrete construction BS 8002: 1994 Earth retaining structures

6.3.

UK Department Department of Transport Transport Standards Standards BD 37/01: Loads for Highway Bridges BA 42/96: The Design of Inegral Bridges

7. APPENDIX A General arrangement drawings.

El Dabasin Overpass Design Statement

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