Plenary Engineering Report

MELBOURNE CONVENTION CENTRE TECHNICAL GRID LOAD REVIEW PROJECT REF: 3283 Melbourne + Brisbane + Perth + London +

+ STRUCTURAL REPORT

WINWARD STRUCTURES PTY LTD 488 La Trobe Street Melbourne 3000 Australia T +61 3 8327 8600 F +61 3 8327 8699 E info@winward.com.au www.winward.com.au

MELBOURNE CONVENTION CENTRE TECHNICAL GRID LOAD REVIEW PROJECT REF: 3283

STRUCTURAL REPORT References AS 1170.0 Structural Design Actions – General Principles AS 1170.1 Structural Design Actions – Permanent, Imposed and Other Actions AS 4100 Steel Structures Original Plenary Hall roof and ceiling structure calculations and drawings.

Project Engineer

Michael Szafranski

DOCUMENT REVISION STATUS

Issue

Revision

Issue Date

Issued By

Structural Report

-

21/11/13

MSz

Disclaimer Information in this report is current as of the issue date. Reasonable skills and care has been taken in the preparation of this report. Winward Structures Pty. Ltd. accepts no liability for loss and damages incurred as a result of reliance placed upon its content.

The mention of any company, product or process in this report does not constitute or imply endorsement by Winward Structures Pty. Ltd. This report is subject to copyright. Use or reproducing copy of this document in whole or part without written consent from Winward Structures Pty. Ltd. constitutes an infringement of copyright.

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3283_Melbourne Convention Centre - Technical grid review.docxDocument Version Date: 25/03/2013

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MELBOURNE CONVENTION CENTRE TECHNICAL GRID LOAD REVIEW PROJECT REF: 3283

As requested by Richard Smith of Brookfield Johnson Controls we present the following report in relation to clarification of allowable applied loads to the Plenary Hall ceiling structure at the Melbourne Convention Centre. Information provided in this report specifically relates to items listed in Winward Group’s proposal letter dated 4th October, 2013.

Report Contents:

1 - Clarification of the nominated technical grid load allowance.

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2 - Clarification of allowable point loads to be hung from TG1 beams.

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3 - Clarification of allowable point loads to be hung from PB2 beams.

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4 – Clarification on the flexibility of nominated ‘Anchor point’ locations.

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5 – Clarification on the flexibility of the truss bottom chord ‘Anchor point’ locations.

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6 – Specific review of the existing speaker loads suspended from the Forestage Technical Grid.

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7 – Specific advice relating to a 1.0t load to be suspended from the BB14 member within the Forestage Technical Grid.

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Item 1 - Clarification of the nominated technical grid load allowance As noted on the Plenary Hall Ceiling Loading Plan (Winward Group drawing S2900_05) the uniform load allowance to all technical grids is 2.8kPa (or 285kg/m2). This live load allowance should be considered an average that can be applied over the entire technical grid area. It must be noted that this average uniform load must also include loads suspended from overhead, ‘top chord’ beams such as ‘winch support beams’, ‘dropline beams’ and ‘pulley beams’. This is denoted by the ‘OR’ shown in the Design Load table on S2900_05.

To further clarify the above, we confirm that a maximum 1.0t point load can be applied to the technical grid flooring (100mm steel channel beams at 60mm clear spacing) using the standard approach of hanging the load through the floor system via a spreading steel beam (the spreader beam is assumed to load a minimum of 4no. steel channels). With these higher loads, clear spacing must be maintained between load points to ensure the 285kg/m2 average is not exceeded.

Using the 1.0t point load as an example, to maintain the 285kg/m2 average the point loads need to have a ‘clear load zone’ of 3.5m2 all around (average 1.87 x 1.87m square area or loads placed on a minimum 1.87 x 1.87m grid).

We reiterate, when calculating this average, loads suspended from pulley beams, etc, above also need to be included as being applied to relevant technical grid area. This is to ensure the supporting trusses are not overloaded.

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MELBOURNE CONVENTION CENTRE TECHNICAL GRID LOAD REVIEW PROJECT REF: 3283

Item 2 - Clarification of allowable point loads to be hung from TG1 beams Further to Item 1 above, as requested we have reviewed the maximum point load which can be suspended from the technical grid secondary beams – TGI as noted on S2900_13 and 14. These are the beams directly supporting the 100mm steel channel technical grid flooring.

We confirm these beams have a maximum point load capacity of 2.0t, with a maximum incline of 30o from vertical, applied anywhere along their length. When applying this 2.0t maximum point load the requirements of maintaining the 285kg/m2 average must still be maintained. As an example 2.0t point loads would need to be spaced on a minimum 2.65 x 2.65m grid (7.0m2 clear load zone).

We note that this 2.0t maximum load must be reduced to 1.4t if the load is inclined to 45o.

Item 3 - Clarification of allowable point point loads to be hung from PB2 beams The PB2 beams are the ‘dropline beams’ at top chord level over the Technical Grid ‘B’, as noted on S2900_11 and 12. Please note that PB2 beams are not those in line with the RT3 truss verticals. Beams directly connected in line with truss verticals are essential to the overall structure stability and have no excess load capacity for hanging point loads.

The Design Load table as shown on S2900_05 denotes that these beams can support 4.0kN/m (400kg/m) with a maximum incline of 30o. As a point load this equates to a single load of 1.5t applied anywhere along the beam, with a similar maximum incline.

We confirm that if the load incline is increased to 45o, the maximum uniform and point load would need to be reduced to 288kg/m and 1.08t respectively.

As in Items 1 and 2 above, with any loads suspended from PB2 beams, the maximum average of 285kg/m2 overall technical grid load needs to be maintained.

Item 4 - Clarification on the flexibility of nominated ‘Anchor point’ locations This item refers to 2.0t point loads denoted as ‘A1’ on S2900_13 and 14, suspended from the ceiling secondary steel structure.

We confirm that if the fixed anchor point location provided is not practical due to clashes with other ceiling items, the 2.0t load can be moved anywhere along the supporting beam. We note that the 6.0 x 6.0m grid spacing nominated on the loading plan S2900_05 must still be maintained.

On S2900_13 and 14, the supporting beam is typically denoted as BB11.

Item 5 - Clarification on the flexibility flexibility of the truss bottom chord ‘Anchor point’ locations Similar to Item 4 above, this item refers to 2.0t point loads denoted as ‘A’ on S2900_13 and 14, suspended from the main ceiling truss bottom chords.

We confirm that if the fixed anchor point location provided is not practical due to clashes with other ceiling items, the 2.0t load can be moved anywhere along the supporting beam making up the truss

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MELBOURNE CONVENTION CENTRE TECHNICAL GRID LOAD REVIEW PROJECT REF: 3283

bottom chord, between connecting truss vertical members. Again, similar to Item 4, we note that the 6.0 x 6.0m grid spacing nominated on the loading plan S2900_05 must still be maintained.

Item 6 - Specific review of the existing speaker loads suspended from the Forestage Technical Grid Grid As requested we have reviewed the existing, permanent speaker loads suspended from the Forestage Technical Grid at each side of the stage. This review has been based on speaker loads of 2 x 300kg and 1 x 450kg and load locations as observed at the time of our inspection conducted on 1/10/13.

We confirm that in this specific location, the permanent speaker loads do not reduce the typical load allowance in this area. To clarify, with the permanent speakers in place, an additional average of 285kg/m2 can still be applied. Guidelines provided in items above regarding spacing of point loads are still to be followed.

Item 7 - Specific advice relating to a 1.0 1.0t .0t load to be suspended from the BB14 member within the Forestage Technical Grid In addition to Item 6 above we have reviewed the request for an additional 1.0t load to be suspended from the BB14 Forestage Technical Grid beam, between Grids P05R and P06R. For the purposes of this review we have assumed the 1.0t load is applied 1.0m from the supporting BB1 beam.

We confirm that this 1.0t load is acceptable in the nominated location; however, this causes the supporting BB1 beam to be loaded to its capacity. Therefore with this 1.0t load in place, no other load can be applied to the Forestage Technical Grid bay between Grids P05R and P06R.

Please refer attached for annotated drawings clarifying the items listed above.

We note that the allowable loads provided above are based on the ultimate capacity of steel beams and that serviceability (or deflection) performance has not been considered. Typically this means that loads applied may cause reasonably high deflections but will not cause the beams to fail in strength.

Please call if you require further clarification of any of the above.

Yours sincerely, Yours sincerely, Yours sincerely, Yours sincerely, Yours sincerely, Yours sincerely, Yours sincerely, Regards, Regards, Regards, egards, ds,

Michael Szafranski ASSOCIATE

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3283_Melbourne Convention Centre - Technical grid review.docxDocument Version Date: 25/03/2013

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TYPICAL PB2 BEAMS AS NOTED IN ITEM 3

BEAMS IN LINE WITH TRUSS VERTICALS ARE TO HAVE NO ADDITIONAL LOAD APPLIED

'A' 2.0t POINT LOAD CAN BE APPLIED ANYWHERE ALONG THE TRUSS BOTTOM CHORD WITHIN A GIVEN BAY - AS NOTED IN ITEM 5 - TYPICAL. 6.0x6.0m GRID SPACING MUST STILL BE MAINTAINED

TR S US Y BA

'A1' 2.0t POINT LOAD CAN BE APPLIED ANYWHERE ALONG THE BB11 BEAM - AS NOTED IN ITEM 4 - TYPICAL

1.0m ASSUMED

EXISTING PERMANENT SPEAKER LOCATIONS AS NOTED IN ITEM 6 TYPICAL FOR EACH SIDE OF STAGE

PROPOSED ADDITIONAL 1.0t LOAD AS NOTED IN ITEM 7 TYPICAL TG1 BEAMS AS NOTED IN ITEM 2