Steel Structural Design For DAVARA Apartment Housing Project in Papua New Guinea

Structural Design Report & Material Quantity & Cost Estimation | DAVARA Housing Project, Papua New Guinea

 

 

1.1 Project Location

Davara Area, Papua New Guinea (PNG)

 

1.2 Building Dimension & Storey Division

Overall building base dimension: 44m (Length) × 30m (Width)

Basement 2 (B2): Plane size 30m × 30m, underground reinforced concrete enclosed structure matched with CBC main steel frame

Basement 1 (B1) ~ 5th Floor: Standard floor plane size 44m × 30m

6th Floor: Top floor retracted plane size 34.8m × 25m

Total structure system: CBC Main Steel Structure + Light Gauge Steel (LGS) Composite Wall System

 

1.3 Design Code Compliance

PNG National Building Code 2023 (PNG NBC): Mandatory local construction, seismic, wind load, fire & corrosion specification

Australian National Construction Code (NCC 2022)

AS 4100: Structural Hot-rolled Steel Structure Design Standard

AS/NZS 4600: Cold-formed Light Gauge Steel Structural Standard

FrameCAD International Production & Design Standard

G550-AZ150 Galvanized Steel Material Australian Material Standard

CBC Global Prefabricated Steel Housing System Standard

 

1.4 Core Structural & Envelope Construction Details

Light Steel Wall System: 150mm C-type LGS stud, G550-AZ150 zinc-aluminum coated steel, FrameCAD integrated design & factory prefabrication; 150mm rock wool thermal insulation filled inside cavity

External Wall Finishing: 12mm cement fiber board + breathable waterproof membrane

Internal Wall Finishing: 12mm standard gypsum board

Floor System: Galvanized steel floor deck + shear studs, 150mm cast-in-situ composite concrete floor slab

Ceiling System: 9mm gypsum board suspended ceiling

M&E System: Full set CBC branded electrical, water supply and drainage materials, 100% Australian standard certified, on-site assembly installation

 

 

2.1 Local Environmental Load Parameter

Basic Wind Speed (PNG Coastal Area): 48m/s (PNG NBC Mandatory Value)

Seismic Fortification Intensity: Grade 7, Site Soil Class C

Ambient Humidity: 85% Annual Average, High Marine Chloride Corrosion Environment

Live Load: Residential Floor 2.0kN/㎡, Public Toilet & Bathroom 2.5kN/㎡, Roof Live Load 0.75kN/㎡

Dead Load: Self-weight of steel structure, wall enclosure, floor concrete, finishing & M&E accessories

 

2.2 Structural System Design Principle

Adopt CBC rigid frame steel main structure for basement and superstructure bearing system; light gauge steel wall as non-load-bearing partition and external enclosure component; steel frame bracing system optimized for PNG typhoon and seismic working condition; overall corrosion resistance upgraded for tropical marine climate, all steel components meet AZ150 anti-corrosion coating requirement.

 

3.1 Underground Structure (B2+B1) Main Steel Section

B2 Column (30m×30m core zone): H-section Steel H450×220×12×16, Q355B hot-dip galvanized steel

B2 Main Beam: H400×180×10×14 Galvanized H Steel

B1 Column: H400×200×10×14 Galvanized H Steel

B1 Secondary Beam: H300×150×8×12 Galvanized H Steel

 

3.2 Superstructure Standard Floor (1F-5F, 44m×30m) Steel Section

Main Frame Column: H350×175×8×12 CBC standard prefabricated galvanized steel

Long-span Primary Beam: H320×160×8×12 Structural Steel

Secondary Floor Beam: H250×125×6×10 Galvanized Steel Beam

Horizontal & Vertical Bracing: C180×70×20×2.5 Cold-formed Galvanized Channel Steel

 

3.3 6th Floor Retracted Floor (34.8m×25m) & Roof Steel Section

6F Frame Column: H300×150×6×10 Light H Steel

Roof Main Beam: H280×140×6×10 Weather-resistant Galvanized Steel

Roof Purlin: C200×75×20×2.8 G550 Galvanized C Purlin

 

3.4 Light Gauge Steel Wall Special Section

Unified wall stud: 150mm C-type LGS, C150×50×15×0.8mm, G550-AZ150 raw material, FrameCAD automatic punching & cutting production, fully meet Australian cold-formed steel and CBC system standard

 

 

No.	Material Description	Unit	Total Quantity	Material Standard & Attribute
1	CBC Main Heavy Steel Structure	Ton	580.00	AS4100, Hot-dip galvanized, PNG code compliant
2	150mm LGS Light Steel Wall Frame	Ton	170.00	G550-AZ150, FrameCAD, AS/NZS4600
3	Galvanized Steel Floor Deck	㎡	8650.00	Composite floor dedicated, with shear stud matching
4	External 12mm Cement Fiber Board	㎡	5650.00	Exterior weatherproof, AU standard
5	Internal 12mm Gypsum Board (Wall)	㎡	18100.00	Fireproof interior partition board
6	9mm Ceiling Gypsum Board	㎡	9500.00	Suspended ceiling special board
7	Floor Ceramic Tile	㎡	9100.00	PNG residential grade anti-slip tile
8	Internal & External Building Door	Set	632	AU fire rating, CBC supporting door set
9	Aluminum Alloy Thermal Break Window	㎡	210.00	Wind & corrosion resistant, PNG coastal standard
10	0.5mm Color Steel Roof Sheet	㎡	750.00	Anti-rust color coated steel roof panel
11	150mm Rock Wool Insulation Material	㎡	5650.00	Wall cavity thermal & sound insulation
12	Waterproof Breathable Membrane	㎡	5650.00	External wall waterproof airtight layer
13	WC Toilet Bowl	Set	60	AU standard sanitary ware, CBC supporting
14	Integrated Bathroom Unit	Set	50	PNG residential bathroom module
15	Independent Bathtub	Set	24	Australian standard sanitary product
16	Wash Basin Cabinet	Set	80	Complete water supply & drainage accessory
17	150mm Cast-in-situ Floor Concrete	m³	1297.50	C30 Commercial Concrete, PNG local mixing
18	Full Set CBC M&E Auxiliary Materials	Lot	1	AU standard electric, water pipe, fitting whole package

 

Price Note: Unit price covers factory manufacturing, raw material, container shipping, PNG Port Moresby customs clearance, local inland transportation; excluding site earthwork, foundation concrete civil construction, temporary construction fee; labor installation cost included in unified landing unit price.

No.	Material Category	Unit Landing Unit Price (USD)	Total Quantity	Subtotal Cost (USD)
1	580Ton CBC Main Steel Structure	1,850 / Ton	580T	1,073,000
2	170Ton G550 LGS Wall Steel	2,200 / Ton	170T	374,000
3	Galvanized Floor Deck + Shear Stud	18.5 / ㎡	8650㎡	160,025
4	External Cement Fiber Board + Breathable Membrane	12.8 / ㎡	5650㎡	72,320
5	Wall & Ceiling Gypsum Board Whole Set	4.2 / ㎡	27600㎡	115,920
6	150mm Rock Wool Insulation Cotton	6.5 / ㎡	5650㎡	36,725
7	Floor Anti-slip Ceramic Tile	15.2 / ㎡	9100㎡	138,320
8	632 Sets Internal & External Doors	195 / Set	632Sets	123,240
9	210㎡ Aluminum Alloy Windows	88 / ㎡	210㎡	18,480
10	0.5mm Color Steel Roof Panel	22 / ㎡	750㎡	16,500
11	Full Set Sanitary Wares (Toilet+Bath+Basin)	Integrated Lump Sum	1 Lot	92,600
12	CBC Brand AU Standard M&E Whole Materials	Integrated Lump Sum	1 Lot	215,000
13	150mm Site Cast Floor Concrete	112 / m³	1297.5m³	145,320
14	Project Design Fee + PNG Code Approval Fee	Lump Sum	1 Item	89,500
15	Contingency Risk Cost (8% Total Material Cost)	Lump Sum	1 Item	197,825
Total Project Estimated Cost	---	---	2,860,575 USD

 

All main steel section, LGS wall component, enclosure board and M&E materials pass PNG NBC 2023 and Australian AS/NZS standard double certification, meet tropical high humidity, typhoon and seismic local building mandatory requirements.

FrameCAD prefabricated 150mm C-type G550-AZ150 light steel wall matches CBC modular housing system, factory pre-production reduces on-site construction cycle, adapts PNG local construction labor condition.

Composite steel-concrete 150mm floor slab optimized for superstructure load transfer, basement size shrinkage structural bracing reinforcement completed, no structural safety hidden danger.

Whole material quantity, steel consumption and budget cost locked according to owner provided original project data, adjustable for material brand, shipping scheme and local tax requirement.