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James Street Underbridge Load Rating and Assessment Marcia Prelog

Introduction - Aventri€¦ · DMRB Vol 3 part 4 BA16/97. 12 2006 2016 2006 2016 Central longitudinal crack with seepage Crack seepage evident, crack form remains the same Spandrel

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Page 1: Introduction - Aventri€¦ · DMRB Vol 3 part 4 BA16/97. 12 2006 2016 2006 2016 Central longitudinal crack with seepage Crack seepage evident, crack form remains the same Spandrel

James Street Underbridge

Load Rating and Assessment

Marcia Prelog

Page 2: Introduction - Aventri€¦ · DMRB Vol 3 part 4 BA16/97. 12 2006 2016 2006 2016 Central longitudinal crack with seepage Crack seepage evident, crack form remains the same Spandrel

2

▪Bridge description and background

▪Site investigation

▪Condition assessment

▪ Load rating

▪ FEA and dynamic response modelling

▪Proposed repair

▪Conclusion

Introduction

Page 3: Introduction - Aventri€¦ · DMRB Vol 3 part 4 BA16/97. 12 2006 2016 2006 2016 Central longitudinal crack with seepage Crack seepage evident, crack form remains the same Spandrel

3

James St Underbridge - Lithgow

Location James St underbridge 1883

Railcorp photo source:

https://www.environment.nsw.gov.au/heritageapp/H

eritageItemImage.aspx?ID=4801535#ad-image-1

Page 4: Introduction - Aventri€¦ · DMRB Vol 3 part 4 BA16/97. 12 2006 2016 2006 2016 Central longitudinal crack with seepage Crack seepage evident, crack form remains the same Spandrel

4

James St Underbridge - Lithgow

John Whitton Knapsack Gully viaduct

Central Station memorial

Page 5: Introduction - Aventri€¦ · DMRB Vol 3 part 4 BA16/97. 12 2006 2016 2006 2016 Central longitudinal crack with seepage Crack seepage evident, crack form remains the same Spandrel

5

Site investigation findings

Cracked keystone

Mortar loss

Water seepage

Lateral movement of top

of wall

Longitudinal cracks on

arch intrados

Page 6: Introduction - Aventri€¦ · DMRB Vol 3 part 4 BA16/97. 12 2006 2016 2006 2016 Central longitudinal crack with seepage Crack seepage evident, crack form remains the same Spandrel

6

▪ Mortar missing and

general weathering of

masonry

▪ Tie rods not in contact

with wall

Investigation findings

Page 7: Introduction - Aventri€¦ · DMRB Vol 3 part 4 BA16/97. 12 2006 2016 2006 2016 Central longitudinal crack with seepage Crack seepage evident, crack form remains the same Spandrel

7

Key defects

Investigation findings

▪ Longitudinal cracks behind

the spandrel wall

▪ Longitudinal cracks at the

centre of the intrados (inner

face of arch)

▪ Water seepage along joints

and cracks

Page 8: Introduction - Aventri€¦ · DMRB Vol 3 part 4 BA16/97. 12 2006 2016 2006 2016 Central longitudinal crack with seepage Crack seepage evident, crack form remains the same Spandrel

8

Site data

Site investigation

▪ Arch dimensions

‒ 6m diameter arch

‒ 8.2 overall width

▪ Concrete slab under

ballast

▪ Stone and mortar

dimensions for load rating

‒ 5 to 10mm mortar

Page 9: Introduction - Aventri€¦ · DMRB Vol 3 part 4 BA16/97. 12 2006 2016 2006 2016 Central longitudinal crack with seepage Crack seepage evident, crack form remains the same Spandrel

9

▪ AS5100 Bridge Design

▪ T HR CI 12008 ST Load rating of underbridges

▪ Vol 3 Section 4 Part 3 BD 21/01-The Assessment of Highway Bridges and Structures

▪ Vol 3 Section 4 Part 3 BA 16/97-The Assessment of Highway Bridges and Structures

▪ Standard MEXE Method inappropriate

▪ Analysis using Archie-M

▪ Design assumptions:

‒ 10MPa sandstone - Class III to IV

‒ 10mm thickness mortar

‒ Internal slab treated as fill with even

load distribution

‒ DLA = 1.8 (BD21/01)

‒ Mixed passenger freight (MF)

232t loading specified

Load rating

Page 10: Introduction - Aventri€¦ · DMRB Vol 3 part 4 BA16/97. 12 2006 2016 2006 2016 Central longitudinal crack with seepage Crack seepage evident, crack form remains the same Spandrel

10

▪ Archie M graphical output

▪ LA taken as the adjusted live load factor

𝐷𝐿𝐴 =𝐿𝑖𝑣𝑒 𝑙𝑜𝑎𝑑 𝑓𝑎𝑐𝑡𝑜𝑟 𝑎𝑡 𝑓𝑎𝑖𝑙𝑢𝑟𝑒

𝐶𝑜𝑑𝑒 𝑔𝑜𝑣𝑒𝑟𝑛𝑒𝑑 𝑙𝑖𝑣𝑒 𝑙𝑜𝑎𝑑 𝑓𝑎𝑐𝑡𝑜𝑟

▪ As New rating:‒ 1.19 for failure at pier

‒ 1.4 for failure in arch

▪ No evidence of pier weakness or failure

▪ Spandrel wall not modelled and did not influence analysis

Load rating

Arch failure

Pier failure

Page 11: Introduction - Aventri€¦ · DMRB Vol 3 part 4 BA16/97. 12 2006 2016 2006 2016 Central longitudinal crack with seepage Crack seepage evident, crack form remains the same Spandrel

11

Load rating - condition rating

• Longitudinal cracks with no progressive

deterioration

• No settlement or arch movements

evident

• Condition factor = 0.7

• As Is LRF = 0.83 (MF load, pier critical)

• Arch LRF > 1Longitudinal crack example –

DMRB Vol 3 part 4 BA16/97

Page 12: Introduction - Aventri€¦ · DMRB Vol 3 part 4 BA16/97. 12 2006 2016 2006 2016 Central longitudinal crack with seepage Crack seepage evident, crack form remains the same Spandrel

12

2006 2016 2006 2016

▪ Central longitudinal

crack with seepage

▪ Crack seepage

evident, crack form

remains the same

▪ Spandrel crack

through voussoirs

with seepage noted

▪ Crack form remains

the same, negligible

outer movement over

time

Page 13: Introduction - Aventri€¦ · DMRB Vol 3 part 4 BA16/97. 12 2006 2016 2006 2016 Central longitudinal crack with seepage Crack seepage evident, crack form remains the same Spandrel

13

▪ 3D model used to correlate site monitoring results

▪ Calibrated model suitable for future assessments and load rating with defined loads

FEA Analysis and Dynamic Response monitoring

mainmark

STRAAM

Page 14: Introduction - Aventri€¦ · DMRB Vol 3 part 4 BA16/97. 12 2006 2016 2006 2016 Central longitudinal crack with seepage Crack seepage evident, crack form remains the same Spandrel

14

Detailed design

▪ New tie bars

▪ New support slab

▪ Masonry stitching

▪ Mortar repair

▪ Safety rails

Page 15: Introduction - Aventri€¦ · DMRB Vol 3 part 4 BA16/97. 12 2006 2016 2006 2016 Central longitudinal crack with seepage Crack seepage evident, crack form remains the same Spandrel

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