SPECIFICATION FOR POLYESTER (PVC/PVDF)

TENSILE FABRIC STRUCTURES

1. CODES AND STANDARDS

1.1 Except as otherwise shown or noted, all work shall comply with the requirements of the following codes and standards.

Applicable National Building Codes

BS 6399 Pt 1 BS Loading Code – Dead and Live Loads

BS 6399 Pt 2 BS Loading Code – Wind Loads

BS 5950 BS Steel Structures Code

2. SYSTEM PERFORMANCE REQUIREMENTS

2.1 General : Provide a structural tensioned membrane system that complies with performance requirements specified by the Subcontractor’s corresponding PVC/PVDF coated polyester architectural membrane system.

2.2 Design Criteria : The tensioned membrane structure shall be designed to comply with the applicable national building code of Malaysia.

Basic wind speed of 120 kph

2.3 Life Safety : All fabric structures shall be designed so no life safety issue is created in the event of a loss of a part of the fabric

2.4 Fire Performance of the Architectural Membrane Fabric :

……………. To be clarified …………..

3. ENGINEERING

Structural calculations for the tensioned membrane structure will include the following :

3.1 Large deflection numerical shape generation that will insure a stable, uniformly stressed, three-dimensionally curved shape that is in static equilibrium with the internal prestress forces, and is suitable to resist all applied loads.

3.2 Large deflection finite element method structural analysis of the membrane system under all applicable applied wind and live load conditions.

3.3 Finite element method structural analysis of the support frame system.

3.4 Member sizing calculations of all primary structural members.

3.5 Connection design including bolt, weld, and secondary member sizing.

3.6 Biaxial fabric test specification, interpretation, and fabric compensation determination.

3.7 Accurate generation of the two-dimensional compensated fabric templates required to generate the three-dimensional equilibrium shape.

4. PRODUCT DATA

Include manufacturer’s specifications for materials, fabrication and installation.

5. SUBMITTALS FOLLOWING AWARD OF CONTRACT

5.1 Genaral Arrangement and Engineering Drawings

5.1.1 The Contractor will be required to obtain the Architect’s approval to his design at two stages.

(a) GA/ Scheme design

(b) Engineering Drawings

5.1.2 The Contractor shall submit fabrication drawings for all elements of each roof for the Architect’s approval. Fabrication shall not proceed until the Architect has approved the drawings.

5.1.3 Any approvals given by the Architect shall not relieve the Contractor of his responsibility for design, material, structural and performance integrity as required by the Architect.

5.1.4 The design of the roofs shall allow for the permitted tolerances in the main structure. Each roof shall be manufactured within tolerances which ensure that they fit on site and do not induce excessive loads or deflections in the companies.

5.1.5 The Contractor shall satisfy himself on the position as constructed of his connection points to the main structure.

5.1.6 Fabric roof system drawings defining the completed structure, anchorage and connection details, interfaces with building construction, and general membrane arrangements.

5.1.7 Include setting drawings, templates, and directions for the installation of anchor bolts and other anchorages installed as a unit of work in other sections.

5.1.8 Indicate where and how the system deviates from contract drawings and specifications. Provide material properties and other information needed for structural analysis including computations prepared, signed, or sealed by a Professional Engineer.

5.2 ENGINEERING COMPUTATIONS

Fabric roof system engineering calculations for the completed structure, anchorage and connection details, interfaces with building construction, and general membrane system.

The Contractor shall select levels of prestress in relation to the behaviour of his structures.

5.2.1 The Contractor shall also select a level of prestress in the fabric such that the effects of ‘crimp interchange’ are removed and subsequent loading and unloading are largely elastic.

5.2.2 The Contractor shall determine acceptable variations in the prestress which are compatible with his design. On or before the issue of the Practical Completion Certificate the prestress shall have stabilized to the agreed design values and tolerances thereon.

5.2.4 The Contractor shall take institute measurement.

5.2.5 At the end of the Work, there shall remain adequate adjustment to allow for future re-stressing.

5.3 STATUTORY APPROVAL

5.3.1 The architect shall be responsible for obtaining approval of his design from any relevant local authorities.

5.4 OPERATIONS AND MAINTENANCE

5.4.1 The Owner shall provide maintenance personnel to be trained in cleaning the membrane otherwise appointment to specialize contractor in order for the warranty to be function properly.

5.5 PRODUCT DELIVERY/HANDLING/STORAGE

5.5.1 Materials shall be packed, loaded, shipped, unloaded, stored, and protected in a manner that will avoid abuse, damage, and defacement.

5.6 WARRANTY

5.6.1 After final payment, the Subcontractor shall furnish the Owner with a written Warranty from Ferrari, which warrants that the PVC/PVDF coated polyester membrane.

6. MATERIALS

The proposed Architectural Membrane Fabric shall be architectural membrane. Refer to attached specification sheet.

6.1 STRUCTURAL FABRIC

6.1.1 This a PVC/PVDF coated polyester architectural membrane fabric. The base material is high tenacity polyester, coated on both sides with Poly Vinyl Chloride (PVC) and a top coat of PolyVinylidene Fluoride (PVDF), also a fluoro polymer.

6.1.2 No substitutions will be allowed and/or the primary materials shall be obtained from one manufacturer. Secondary materials shall be those recommended by the primary manufacturer, and the fabric shall meet the following criteria:

6.2 GENERAL REQUIREMENTS

6.2.1 Provide a self cleaning fabric, from a single manufacturer, with a life expectancy of 15 years.

6.2.2 The fabric shall be woven from yarn of the highest quality and shall be free of broken yarns and jointed filaments. Warp and fill yarns shall be straight and perpendicular within a tolerance of 2 degrees. The bow in the fill direction shall not exceed 20mm or 1 in 70 whichever is the lesser.

6.2.3 The fabric shall be uniform, with no significant blemishes visible to the eye when viewed from a distance of 4m in direct sunlight.

6.2.4 The matrix shall be continuous to give full weather protection, without defects. The entire membrane shall be fabricated from one type of fabric.

6.3 PHYSICAL CHARACTERISTICS

6.3.1 The following indicates the physical properties of Polyester PVC/PVDF coated architectural membrane anticipated for this project. Determination of specific characteristics and selection of a membrane is verified during project engineering analysis and requirements.

Coated Fabric Weight, } Please refer to Specification

Thickness, mm: } Sheet submitted/attached

Weave Style: } for Technical Information.

Dry Strip Tensile, N/5cm }

Trapezoidal Tear, N }

Translucency (%): }

Adhesion }

6.4 STRUCTURAL STEEL, METAL COMPONENTS AND CABLES & FITTINGS

6.4.1 Type: Circular hollow section (CHS) otherwise specified and

approved.

Material: Grade 43 steel

6.4.2 All steel work shall comply with `Steelwork’ section of this specification complies with requirement of BS 5950 Steel Structure Code.

6.4.3 Exercise great care in marking, cutting, aligning, checking, welding seams and additions as well as general handling and soiling prevention procedures to produce a smooth uniform surface with even curved edges and interfaces lacking wrinkling, cuts, abrasions, stains or marks, surface imperfections or welding aberrations.

6.4.4 All steel work shall be surface cleaning and painted with Jotun/ Nippon polyurethane paint otherwise approved. The colour choice shall be choice of architect.

6.4.5 Take care in handling, loading, delivery, unloading and storage on site.

6.4.6 Supply the components to site in a pre-fabricated state ready for erection with little fabrication at on site.

6.4.7 Check that the foundations on which steel is to be placed are at the correct levels to receive base plates and/or other fixings and verify the correctness for location and/or level of all anchor bolts set in the bases and immediately notify the Architect of any inaccuracies. If these inaccuracies are outside of tolerance shown on drawings, the matter shall be referred to the Architect.

6.4.8 Be responsible for the accurate bearing of the steel on the foundations, for correct location, shimming to suit correct levels and placement of all members.

6.4.9 Erect steelwork under the supervision of an experienced and qualified person who has specifically had involvement with the erection of fabric structures.

6.4.10 Any metal corners or edges in contact with the membrane shall be rounded to suitable radii.

6.4.11 Suitable separating washes and sleeves shall be provided between that bolts.

6.4.12 All cables to be Galvanised cables All tensioners nuts and fabric plates to be Hot-Dip Galvanised.

6.4.13 Be wholly responsible for the erection of the steelwork, cables and incidental metalwork.

6.5 FIX CLAMP & MEMBRANE PLATES

6.5.1 Fix clamp and membrane plates shall be similar protective finishing with the structural steel.

6.6 BOLTS

6.6.1 Bolts shall be hot dip galnased with washers under head and nut otherwise will be galvanized finished for structural/ or high tensile bolts, washer and nuts.

7. MANUFACTURE

7.1 The Contractor shall store incoming material at a similar temperature and humidity as that of the fabrication.

7.2 The Contractor shall maintain an extremely clean and dust-free environment to avoid weld contamination.

7.3 For structural welds in PVC/PVDF membrane fabric, the Contractor shall use a heated bar type where the bar temperature, pressure and dwell time are automatically controlled during the weld cycle according to

previously determined prescriptions which suit various combinations of weld width, material weight and number of layers.

7.4 The Contractor shall fabricate each membrane into single piece.

7.5 The Contractor shall employ great care in cutting the fabric to smoothed-in curves. Pieces that include faults, small tears, or mis-cuts shall not be used in the work.

7.6 The Contractor shall cut the edges of panels to accuracy consistent with his design sensitivity calculations.

7.7 The Contractor shall ensure all seams are continuous without gaps or trapped pockets and are of uniform width. Integrity of the coating must be maintained to ensure isolation of yarns from air and water. Discoloration of seams, junctions and reinforcements will not be acceptable.

8. ERECTION

8.1 The Contractor shall inspect the base steel structure and confirm that it is suitable to receive the fabric.

8.2 The Contractor shall be wholly responsible for transport to and handling on site, employing particular measures to prevent any damage occurring to the fabric’s coating or to the yarns. The Contractor is to arrange for facilities for storing the material so that it is kept clean and is not in any way damaged between being delivered to site and erected into position.

8.3 Prior to the start of erecting fabric panels, the Contractor shall check all surfaces to be in contact with the fabric. He shall remove any potential cause for rips that may occur during installation of the fabric, and shall provide soft cushioning material over any surfaces against which the membrane may be laid.

8.4 At all times, creasing the fabric or folding the fabric around sharp corners shall be avoided. The fabric shall not be abraded in any manner; for example, by pulling tools across it or by dragging the membrane across surfaces.

8.5 Those walking on it shall wear appropriate soft shoes. The surfaces upon which any fabric is placed shall be smooth, and free or projections and sharp irregular objects.

8.6 Any damage to fabric and fittings must be reported to the Architect immediately following the occurrence. The Contractor shall carry out repairs to give finished roofs in accordance with the Specification and the other contract documents and shall provide the Architect with a method statement for such repairs.

8.7 Visible repairs to the finished membrane will not be acceptable.

8.8 During the course of erection the Contractor is to take and record measurements of the membrane forces. The Architect shall be given free access

to this information during the course of erection, and upon completion of the work the Sub-Contractor shall give the Architect a complete record copy.

8.9 Both surfaces of the fabric shall be left clean at the time of Practical Completion of the work to the satisfaction of the Architect.