Structural Appraisal & Repair

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Arena Country Club

RENOVATOIN WORK

ARENA Country Club

TOH HONG ZHIA

KYAW SWAR HLAING

DCE PART-TIME (YEAR 3, SEMESTER 1)

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ARENA Country Club | Renovation Work

CONTENT

Page

1. Executive Summary 2

2. Introduction

i. Arena Country Club 2

ii. Description of the Building 2

iii. Existing Structural System 2

iv. Existing Structural Condition

a) Desk Study 3

b) Field Investigation 3

3. Renovation & Upgrading Work 3

i. Reason for renovation works 3

ii. Design Consideration Stage

 Owner’s Requirement 3

 Statutory Requirements 4

 Architectural Aspect 4

 Structural Aspect 4

iii. Foundation and Sub-Structural System 4

iv. Super-Structural works

a) At 3th Storey 4

b) At 4th Storey 4

c) Roofing works 5

d) Internal Steel Staircase 5

4. Problems faced during the renovation work 6

5. References 6

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comply current code of practice of relevant statutory authorities.

Introduction

i. Arena Country Club

The Arena Country Club stands in close proximity to the Singapore Discovery Centre and the SAFTI Military Institute at 511 Upper Jurong Road, Singapore. It occupies 28,755 sq.m. that is poised to become an exciting hub brimming with endless activities for its members.

ii. Description of the Building

The Arena Country Club consists of 3 main blocks with various facilities. The 2 storey main block and left wing consist of restaurant, admin office, bowling centre ,function hall, lap swimming pool, pub, children playground centre, kitchen and etc.

The 3 Storey right wing block consist of gymnasium, toilet, and sauna at 1st storey and KTV rooms at second storey. (The report will be focused only for this block)

The 3 storey amenities block consists of fast food outlet, convenience store, toilet, pro shop at 1st storey. There are indoor sport areas with multi-purpose courts, golf driving range deck, office and etc at 2nd storey. The 3rd storey is storeroom and open sky driving range.

The single storey food court located the side of the amenities block.

iii. Existing Structural System

The existing RC building is generally constructed with conventional RC structure up to second storey including the Pad Footing, Beams, Columns & slabs forming the main structural members of the building. Existing roofing system is the RC flat roof and serving the Water Tank on top of it. Existing Columns & Beams goes up to the next level to capture the future extension of roof and there is one bay of RC slab.

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ARENA Country Club | Renovation Work iv. Existing Structural Condition

a) Desk Study:

The available existing structural plans and details indicate the designed live load for the 1st and 2nd Floors are 5.0 kN/m2. Existing 1st Storey floor slab is designed as slab on grade. Existing 2nd Storey slab is designed as two way RC slab. The footing and column are designed not only for the existing 3-Storey Building but they are designed to capture for future roof extension. All the Dead & Live loads are distributed through beams, columns are sitting on the pad footing. The Design Strength of steel is fy =460N/mm2 and concrete is f’c= 30N/mm2

b) Field Investigation:

Site investigation is carried out to verify the as built plans. The layout of structural framing & sizes are tally with approved plan. There is no addition & alteration and no sign of overloading is found. There is no sign of defect such as cracking, curling, joint failure & water penetration is found on slab on grade. Existing beams and column are structurally sound and no sign of structural distress or crack is found during the inspection. Existing Roof slab is found to be no water seepage.

Renovation & Upgrading Work

i. Reason of Renovation Work

When it comes to stability and integrity of the existing building and its structural is sound and stable. But owner decided to renovate to increase the serviceability and upgrade the building to meet the statutory requirement such as Accessibility and Fire safety requirement, etc.

ii. Design Consideration Stage

 Owner’s Requirements

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And the building is required to be accessible especially for the wheel chair users and persons with disabilities. As such, the minimum accessibility provisions such as handicap carpark, accessible route, ramp, lift designated for wheel chair users, water closet and bath facilities and signage etc.

 Architectural Aspect

Architect has to concern about not only the owner’s requirement and request but also the statutory requirements as stated above.

 Structural Aspect

Engineer has to think of the design in such a way that all the requirement to be complied with low cost. Moreover, new structural works and strengthening works are required to meet the factors including effectiveness, constructability, durable, cost-efficient and aesthetics.

iii. Foundation & Sub Structural System

The existing RC pad footings, which have been taking into consideration for future

extension, are able to withstand the current loading and future loading comes from

additional storey and new roof system. Two new RC pad footings are provided to support the external steel staircase and new lift structures, which are supporting the overhead water

tank above. Allowable soil bearing capacity is 75 kN/m2. All load from overhead tank, steel staircase and lift are transfer through the new RC Column. Please refer to the attached drawing Appendix 1.

iv. Super Structural Work a) At 3rd Storey

The design imposed load of existing 3rd Storey is 5.0kN/m2 and loading requirement has met for the intended usage. Moreover, the inspection and structural analysis shown the existing structural is in good condition thus the existing structure does not required to do the strengthening for change of use.

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ARENA Country Club | Renovation Work b) At 4th Storey

The design imposed load of 4th Storey Beam and one panel of slab does not met the loading requirement of the change of use, therefore strengthening works to the existing beams is required to withstand the future loading. Although there are many methods of strengthening concrete beams, because of the fireproofing and aesthetics requirement, enlarging the concrete section is the most suitable method. Active method of strengthening is adopted as the current members are upgraded to resist both future (live & superimposed) and existing (dead) loads. The strengthening works, involving pre-stressing and jacking current members to remove the existing stresses, will be carried out as shown in the attached Drawing Appendix 2.

The 4th Storey slab will be supported by the 300x96x27.5x2.4x10.09 kg/m Lipped Channel. The slab is designed as composite concrete slab with 0.75mm BMT Lysaght Bondek II (yield strength 550 Mpa). The detail of the composite slab is as shown in the attached Drawing Appendix 3. The properties of the Lysaght Bondek II are shown as below.

c) Roofing Work

Roofing is separated into two portions, three perimeter side of the building except rear elevation, are covered with clay tile roof. And the remaining portion including the alongside of the rear elevation is covered by metal roof. Roof Truss are fixing to the Stanchion which is fixed and supported by 4th Storey beam.

d) Internal Staircase

Internal staircase from 3rd to 4th Storey is designed as Steel Staircase. Please refer the attached Appendix 3.

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which is turning alongside of the steel staircase and new lift core.

iii) The design of the roof truss base on the two directional slopes which is roof pitch angle and slope due to the irregular shape. So, the truss heights are varying according to the slope. Please refer to the attached Appendix 4.

iv) To prevent the buckling of the truss, engineer adopted the fly brace connection to strength the roof truss from the purlin by bracing angle. Please refer to the attached

Appendix 3.

References

1. The Institution of Structural Engineers (2010), Appraisal of Existing Structures (3rd Ed.)

International HQ, 11 Upper Belgrave Street, London SW1X8BH.

2. Internal Concrete Repair Institute (Feb 2006), Technical Guidelines, Guideline

No.03742, Guide for selection of strengthening systems for concrete structures. 3166 S. River Road, Suite 132, Des Plaines, IL 60018.

3. Building & Construction Authority (2007), Accessibility Code 2007, 5 Maxwell Road #16-00 Tower Block MND Complex, Singapore 069110.

4. BCA Academy of the Built Environment (2011), Structural Appraisal & Repair

(Lecture Notes).200 Braddell Road, Singapore 579700.

5. http://www.scdf.gov.sg/content/scdf_internet/en/building-professionals/publications.html

6. http://bca.gov.sg/Publications/publications.html

7. http://www.bluescopesteelasia.com/bluescopesteel/country/singapore/lysaght/en/ 8. http://www.arenaclub.com.sg/