report futsal court kemasek

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a comprehensive report on post installed roof trusses for the futsal court which having structural problem due to under estimated on the value thrust force from the trusses that causes structural failure to the reinforced concrete supporting columns

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  • COMPREHENSIVE REPORT ON THE FAILURE OF ROOF TRUSSES SYSTEM AT FUTSAL COURTCADANGAN PEMBANGUNAN PUSAT KOMERSIL RANTAU PETRONAS YANG MENGANDUNGI 1 UNIT KOMPLEKS MEMBELI-BELAH DAN REKREASI DI ATAS SEBAHAGIAN LOT

    6490, DI RANTAU PETRONAS, MUKIM KERTEH, DAERAH KEMAMAN, TERENGGANU DARUL IMAN UNTUK TETUAN : METRO KEMASIK SDN. BHD.

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    1.0 INTRODUCTION

    An incident occurred during the roof construction for Futsal Court on 26 June 2007 at about 4.00

    pm. It was reported that the construction workers heard a loud noise as if resembling tearing of

    metal plates and disintegration of bolts. It was also noted that a few interior columns especially

    facing Main Curve Corridor deflected significantly in outward position especially at column end.

    Cracks to column face occurred at the lower region close to the ground/base level. No crushing to

    concrete column detected hence cracks occurred in tension face known as tension crack.

    At the time of incident, it was recorded that all roof trusses and purlins has been installed while part

    of insulation work still in progress. No M & E installation work was carried out (Refer to Figure 1)

    FIGURE 1

    Orbtech Engineering Corporation Sdn Bhd, (OECSB) contractually as the main contractor, had

    suspended the roofing installation work and immediately erected temporary support in the form of

    scaffolding assembly upon the directive by Superintending Officer. Hazard tape was installed along

    the building perimeter secluding the area from unnecessary personals.

  • COMPREHENSIVE REPORT ON THE FAILURE OF ROOF TRUSSES SYSTEM AT FUTSAL COURTCADANGAN PEMBANGUNAN PUSAT KOMERSIL RANTAU PETRONAS YANG MENGANDUNGI 1 UNIT KOMPLEKS MEMBELI-BELAH DAN REKREASI DI ATAS SEBAHAGIAN LOT

    6490, DI RANTAU PETRONAS, MUKIM KERTEH, DAERAH KEMAMAN, TERENGGANU DARUL IMAN UNTUK TETUAN : METRO KEMASIK SDN. BHD.

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    The roof fabricator and installer for the project is S.P. Mega Sdn. Bhd. (SPMSB). On the other hand

    Design Pro Consult Sdn Bhd (DPCSB) was appointed by SPMSB for the jointing design. A joint visit

    was conducted on 3rd July 2007 at about 3.00 pm followed by a technical meeting chaired by

    KLCCPSB. The outcome from the meeting resulted several remedial work proposals, monitoring

    requirements and general review of the jointing design.

    Upon the meeting, DPCSB has taken an initiative to provide detail calculation as well as reviewing

    the overall incident. The purpose of this report is to outline the initial design approach, detailed

    design, failure mode and recommendations based on technical aspect and observation. This report

    is prepared with full responsibility and without prejudice.

    2.0 WORK SCOPE OF DESIGN PRO CONSULT SDN BHD

    In terms of contractual arrangement, OECSB appointed SPMSB as the roof fabricator and installer.

    The contract require design proposal and endorsement from Professional Engineer appointed by

    SPMSB for the jointing adhering to the roof truss design prepared by MECIP (M) Sdn Bhd. (MECIP).

    DPCSB was given a set of construction drawing showing the required roof truss numbers,

    dimensions, profile, support locations, purlin arrangement and roofing materials.

    As such, the workscope for DPCSB mainly is to verify the joint details at main spine - column, truss

    - beam and splice connections as proposed in the construction drawings upon finalization of

    fabricators shop drawing. DPCSB made a comprehensive comparison between the proposed

    connection details and the new connection details (if any) and shall be discussed further in Section

    5 of this report.

    Technically, the jointing design will show the joint locations, number of bolts required, bolts sizes,

    arrangement, grade, embedded/anchored length, connecting plate details (sizes, thickness and

    material grade) as well as splice plate details. In principle, this exercise shall not cover structural

    beam and column design both under ultimate limit and serviceability. It is assumed that these

    structures have been adequately designed and detailed.

  • COMPREHENSIVE REPORT ON THE FAILURE OF ROOF TRUSSES SYSTEM AT FUTSAL COURTCADANGAN PEMBANGUNAN PUSAT KOMERSIL RANTAU PETRONAS YANG MENGANDUNGI 1 UNIT KOMPLEKS MEMBELI-BELAH DAN REKREASI DI ATAS SEBAHAGIAN LOT

    6490, DI RANTAU PETRONAS, MUKIM KERTEH, DAERAH KEMAMAN, TERENGGANU DARUL IMAN UNTUK TETUAN : METRO KEMASIK SDN. BHD.

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    3.0 FUTSAL COURT TRUSS DESIGN DATA

    From the construction drawings provided, the following data were extracted and used as a basis for

    jointing design.

    Steel Structures

    Main spine members 406.4 mm x 7.9 mm x 77.6 kg/m CHS

    Top chord members 140 mm x 5.0 mm x 16.6 kg/m CHS

    Internal members for the triangulated form 114 mm x 3.6 mm x 16.6 kg/m CHS

    Curved angle approximately 8.5 degree

    Steel selfweight 77 kN/m3

    Steel Grade 43A/S275

    Bolt Grade 8.8

    Roofing dead load 0.06 kN/m2

    Insulation and purlin 0.06 kN/m2

    M & E services 0.25 kN/m2

    Live load 0.25 kN/m2

    Wind load (uplift) 0.25 kN/m2

    These data shall be used in deriving internal forces, determining the splice joint requirement,

    connecting plate and bolts.

    Concrete Structures

    Column size 400 mm x 400 mm

    Beam size (receiving end) 450 mm x 1400 mm

    Concrete Grade 30 N/mm2 at 28 days

    These data shall be used for designing main spine column connection.

  • COMPREHENSIVE REPORT ON THE FAILURE OF ROOF TRUSSES SYSTEM AT FUTSAL COURTCADANGAN PEMBANGUNAN PUSAT KOMERSIL RANTAU PETRONAS YANG MENGANDUNGI 1 UNIT KOMPLEKS MEMBELI-BELAH DAN REKREASI DI ATAS SEBAHAGIAN LOT

    6490, DI RANTAU PETRONAS, MUKIM KERTEH, DAERAH KEMAMAN, TERENGGANU DARUL IMAN UNTUK TETUAN : METRO KEMASIK SDN. BHD.

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    4.0 CHANGES MADE TO THE ROOF TRUSS

    Generally the truss assembly consists of a single member main spine (or bottom chord), two

    parallel members as top chord and a three piece triangulated internal members. There are Four (4)

    splice plates and Two (2) end connections between main spine and column. (Refer Figure 2) . Two

    (2) stages of design calculation and shop drawing were produced and submitted for approval due to

    changes informed by SPMSB.

    FIGURE 2

    Stage 1

    At this stage, the connection design, details and shop drawings were produced based on the

    following roof truss data :-

    Roof span 40.4 meter

    Bottom chord profile straight

    Truss members generally adopting RHS assemblage

  • COMPREHENSIVE REPORT ON THE FAILURE OF ROOF TRUSSES SYSTEM AT FUTSAL COURTCADANGAN PEMBANGUNAN PUSAT KOMERSIL RANTAU PETRONAS YANG MENGANDUNGI 1 UNIT KOMPLEKS MEMBELI-BELAH DAN REKREASI DI ATAS SEBAHAGIAN LOT

    6490, DI RANTAU PETRONAS, MUKIM KERTEH, DAERAH KEMAMAN, TERENGGANU DARUL IMAN UNTUK TETUAN : METRO KEMASIK SDN. BHD.

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    The design was performed conservatively treating the overall arrangement (in a lattice form) as a

    single member. This exercise however shall is null and void as the second stage design supersede.

    Stage 2

    At this stage several changes were incorporated as listed :-

    Roof span 60.4 meter

    Bottom chord profile curve at approximately 8.5 degree

    Truss members generally adopting CHS assemblage

    The design was again performed conservatively treating the overall arrangement (in a triangulated

    form) as a single member. It was noted that curved roof structures exhibit horizontal force compared

    to straight profile. However, this horizontal force is not significant in the case of compression bolting

    connection with the presence of connecting plate that will distribute the force into surface pressure

    to the column and localized effect shall be checked. This horizontal force however may be

    significant to the structural column as it act as a concentrated load pushing the column outward.

    The deflection of receiving columns is beyond the work scope in this exercise.

    A design proposal was submitted together with the construction drawing for approval as shown in

    Appendix A and Appendix B.

  • COMPREHENSIVE REPORT ON THE FAILURE OF ROOF TRUSSES SYSTEM AT FUTSAL COURTCADANGAN PEMBANGUNAN PUSAT KOMERSIL RANTAU PETRONAS YANG MENGANDUNGI 1 UNIT KOMPLEKS MEMBELI-BELAH DAN REKREASI DI ATAS SEBAHAGIAN LOT

    6490, DI RANTAU PETRONAS, MUKIM KERTEH, DAERAH KEMAMAN, TERENGGANU DARUL IMAN UNTUK TETUAN : METRO KEMASIK SDN. BHD.

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