MELBOURNE CONVENTION CENTRE CONVENTION
TECHNICAL GRID LOAD REVIEW GRID REVIEW
PROJECT REF: PROJECT REF: 3283 3283
STRUCTURAL REPORT STRUCTURAL REPORT STRUCTURAL STRUCTURAL
References
References
References
References
AS 1170.0
AS 1170.1
Structural Design Actions – General Principles
Structural Design Actions – Permanent, Imposed and Other Actions AS 4100 Steel Structures
Original Plenary Hall roof and ceiling structure calculations and drawings.
Project Engineer
Project Engineer
Project Engineer
Project Engineer
MichaelSzafranski
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MELBOURNE CONVENTION CENTRE CONVENTION
TECHNICAL GRID LOAD REVIEW GRID REVIEW
PROJECT REF: PROJECT REF: 3283 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: Report
1-Clarificationofthenominatedtechnicalgridloadallowance. Page3
2-ClarificationofallowablepointloadstobehungfromTG1beams. Page4
3-ClarificationofallowablepointloadstobehungfromPB2beams. Page4
4–Clarificationontheflexibilityofnominated‘Anchorpoint’locations. Page4
5–Clarificationontheflexibilityofthetrussbottomchord‘Anchorpoint’ locations. Page4
6–Specificreviewoftheexistingspeakerloadssuspendedfromthe ForestageTechnicalGrid. Page5
7–Specificadvicerelatingtoa1.0tloadtobesuspendedfromtheBB14 memberwithintheForestageTechnicalGrid. Page5
Item 1 1- Clarification of the nominated technical grid
Clarification the grid load allowance 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.
MELBOURNE CONVENTION CENTRE CONVENTION
TECHNICAL GRID
PROJECT REF: PROJECT REF: 3283 3283
LOAD REVIEW GRID
REVIEW
Item 2
Item 2 2 2-
Clarification of allowable point loads to be hung from TG1 beams
Clarification of allowable point loads to be hung from TG1 beams
Clarification allowable point to be hung beams
Clarification allowable point 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 Item 3 3 3- Clarification of allowable po
Clarification allowable point loads to be hung from int
Clarification of allowable po
Clarification allowable po
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 Item 4 4 4- Clarification Clarification Clarification Clarification on the flexibility of nominated ‘Anchor point’ locations on the flexibility of nominated ‘Anchor point’ on the of nominated ‘Anchor on the 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 5- Clarification Clarification on the fl on the fl on the flexibility of the truss bottom chord ‘Anchor point’ locations exibility of point’ locations exibility
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
MELBOURNE CONVENTION CENTRE CONVENTION
TECHNICAL GRID LOAD REVIEW GRID REVIEW
PROJECT REF: PROJECT REF: 3283 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 6- Specific review of the existing speaker loads suspended from the Forestage Specific of existing speaker loads suspended from the Forestage Technical G G Grid ridrid
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 7- Specific advice relating to a 1 Specific advice relating to a 1 Specific relating to 1 Specific relating to 1.0 .0.0 .0t load to be suspended from the BB14 member within the t load to be suspended from the BB14 member within to be suspended the BB14 member within t to be suspended the BB14 member within Forestage Technical Grid 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, ds,egards, Regards,
Michael Szafranski ASSOCIATE
BEAMS IN LINE WITH TRUSS VERTICALS ARE TO HAVE NO ADDITIONAL LOAD APPLIED
TYPICAL PB2 BEAMS AS NOTED IN ITEM 3
'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
'A1' 2.0t POINT LOAD CAN BE APPLIED ANYWHERE ALONG THE BB11 BEAM AS NOTED IN ITEM 4 TYPICAL
TRUSS BAY
PROPOSED ADDITIONAL 1.0t LOAD AS NOTED IN ITEM 7
1.0m ASSUMED
EXISTING PERMANENT SPEAKER LOCATIONS AS NOTED IN ITEM 6TYPICAL FOR EACH SIDE OF STAGE
TYPICAL TG1 BEAMS AS NOTED IN ITEM 2