TOPIC 4

Build Ability OF DESIGN

CONTENTS:-

Concept of build ability

Examples of Prefabricated Components

Used in Buildings

General Guidelines on Design Concepts

Using Components

Examples of Projects Employing

Components

build ability

Defined as “ the extend to which design of the

buildings facilitates ease of construction, subject to the overall requirements of completed building.”

Construction Industry Research and Information Association (CIRIA)

Definition focused on the link between design and construction

and implied factors which have significant impact on the ease of

construction of a project.

BUILD

ABILITY

DESIGN

Influence on

design decisio

ns

CONSTRUCTION

Impact of

design decisio

ns

Also defined as “the ability to construct a building efficiently, economicallyand to agreed quality levels from its constituent materials, component andsub-assemblies”.

KEY FEATURES OF build ability DESIGN

•Usage of Components

•Employment of Modular Coordination in Dimensions

DISCUSS IN 5 MINUTES:-

What is the relationship between build ability with usage of component and modular

coordination in construction?

The usage of component such as IBS component will

speed up the construction process.

With the employment of modular coordination, the size

and dimension of the component will be standardize and

reduce the problem on site.

Thus, it helps to construct building efficiently,

economically with agreed quality level = build ability.

The goal of build ability is to achieve optimum

integration of construction knowledge in the building

process and balancing the various projects and

environmental constraints to achieve maximisation of

projects and environmental constraints to project goals

and building performance (Construction Industry

Institute, Australia (CIIA)

BUILD ABILITY AS KEY ELEMENTS IN BUILDING PRODUCTION

a workable concept of build ability needs to recognise the many

factors in a project environment which has an impact on the design

process, the construction process, and the link between design and

construction.

The extent to which decisions, made during the whole building

procurement process, ultimately facilitate the ease of construction

and the quality of the completed project.

Earlier research stated that the designers are responsible to design

the simplest method statement dealing with onsite detailed works.

The elaborate designs should be able to smooth the progress

of construction programme, thus critical path of site

operations can be variable in despite of the complexity of task

sequencing and the interrelationship between different sub-

contractual works; e.g. material on site, material storage,

material handling, details positioning and installation.

The efficient programme management occupies high mark of

construction safety environment.

Likewise, site accidents and unwanted expenditure can be

diminished.

A building should be up in an economic and efficient manner requires a logical organization of the assembly sequence. Each sequence of

activity must be made possible by ensuring that materials, components and sub-assemblies are delivered to site, handled, stored,

converted and prepared ready for assembly into the building (Figure 1).

Labour, plant, and equipment must be well managed to ensure continuity of work through the flow of materials, components, and sub-

assemblies into the construction process.

Good build ability assisted by efficient management ensures a logical sequence to the assembly to ensure the building process can be

easily followed to optimise the building process.

Care must be taken that, agreed quality level in terms of “function and performance” and aesthetics in relation to “cost and build ability”

is achieved at the end of the building process to ensure project success.

Figure 1 Assembly sequence on construction site

DCC 2052

Industrialised Building System

IBS SCORE

(CIS 18: 2010 – MANUAL FOR IBS CONTENT SCORING SYSTEM )

CIS 18 : 2010

IBS Score Calculation Example

IBS Score

Calculation

Examples

ASSESSMENT METHOD

IBS Content Scoring System (“IBS Score”)

ASSESSMENT METHOD

IBS Content Scoring System (“IBS Score”)

Capacity utilization of prefabricated (precast) beam / column / slab

= 750m2 = 75%

FROM Table 1:- for precast beam/column/slab, F = 1.0

Capacity utilization of conventional methods (in situ)

= 250 m2 = 25%

Total Area of Construction = 1,000 m2

25% 75%

ASSESSMENT METHOD

IBS Content Scoring System (“IBS Score”)

FROM Table 1: for in-situ, F = 0

25% 75%

Total Area of Construction = 1,000 m2

Capacity utilization of prefabricated (precast) beam / column / slab

= 750m2 = 75%

Capacity utilization of conventional methods (in situ)

= 250 m2 = 25%

ASSESSMENT METHOD

IBS Content Scoring System (“IBS Score”)

From Table 1, for precast beam/column/slab, F = 1.0

From Table 1, for in-situ, F = 0

Therefore; for Part 1 (Structural System) IBS Score,

= [(75% x 1.0) + (25% x 0)] x 50% = 37.5 %

25% 75%

ASSESSMENT METHOD

IBS Content Scoring System (“IBS Score”)

Length of precast panel walls (precast concrete)

= 7,500 m = 75%

Table 2, precast concrete panel, F = 1.0

Table 2, common brickwall, F = 0

Length of brickwalls (common bricks)

= 2,500 m = 25%

Total length of the wall is = 10,000 m run

Therefore, total score for Part 2 (Wall System)

= [(75% x 1.0) + (25% x 0)] x 20%

= 15%

ASSESSMENT METHOD

IBS Content Scoring System (“IBS Score”)

Table 2, precast concrete panel, F = 1.0

Table 2, common brickwall, F = 0

Example 1

2-storey Terrace House

The measurement taken from drawings:

1) Construction area

i) Construction area ground floor = 117.0 m2

ii) Construction area 1st floor = 117.0 m2

iii) Construction roof area = 117.0 m2

Total construction area = 351.0 m2

2)Structural Systems

i) Beams: Precast concrete beams

ii) Columns : In-situ concrete using steel formworks

iii) Floor slab: Precast half slabs floor

iv) Roof truss: Prefabricated timber roof truss.

3) Wall System

i) Internal wall:Precast concrete panel (43.9 m)

ii) External wall: Precast blockworks (39.8 m)

Other simplified construction solutions

i) Beams: 60% complies to MS 1064

Columns: 100% complies to MS 1064

Walls and slabs: Less than 50% complies to MS 1064

Doors : 80% complies to MS 1064

Windows: 0% complies to MS 1064

ii) Horizontal repetition of structure = 100%

72.1IBS CONTENTS SCORE OF PROJECT (Part 1 + Part 2 + Part 3)

16Total Part 3

6100%iv) Horizontal repetition of structure = 100%

480%iii) 80% of door sizing follow MS 1064 Part 4: 2001

4100%ii) 100% of column sizing follow MS 1064 Part 10: 2001

260%i) 60% beam sizes follow MS 1064 Part 10: 2001

Part 3: Other simplified construction solutions

14.81.00167.3 mTotal Part 2

0.48 x 1.0 x 20

=9.6

(79.5/167)

=0.481.0079.5 mInternal wall using precast concrete panel

0.52 x 0.5 x 20

=5.2

(87.8/167)

=0.520.587.8 mExternal wall using precast concrete blockworks

Part 2: Wall System

41.31.00351.0 m2Total Part 1

0.33 x 1.0 x 50

=16.5

(117/351)

=0.331.0117.0 m2Roof truss using prefab roof truss

Roof area = 117.0m2

0.33 x 0.6 x 50

=9.9

(117 / 351)

=0.330.6117.0 m2

Precast beams + in-situ column with reusable formwork

(no floor)

1st floor area = 117.0m2

0.33 x 0.9 x 50

=14.9

(117 / 351)

=0.330.9117.0 m2

Precast beams + in-situ column with reusable formwork

+ precast concrete half slab floor.

Ground floor area = 117.0m2

Part 1: Structure Elements

IBS

SCORECOVERAGE

IBS

FACTOR(1)

AREA (m2) or

Length (m)ELEMENTS

Example 2

18 Storey Condominium

The measurement taken from drawings:

1) Construction Area Area for 1 unit of condominium = 94.4 m2

Lift lobby area = 140 m2

Area for 1 floor = [94.4 x 6 units + 140] = 706.4 m2

2) Structural Systemsi) Tunnel formwork systemii) Roof truss: prefab steel roof truss.

3) Wall System/ floori) Precast blockworks (6 units + lobby area)= 263 m lengthii) Tunnel formwork (6 units + lobby area) = 120 m length

4) Other simplified construction solutionsi) Doors : 100% comply to MS 1064

Windows: 100% comply to MS 1064ii) Repetition of floor to floor height = 90%

Vertical repetition of structural floor layout = 80%

53.6IBS CONTENTS SCORE OF PROJECT (Part 1 + Part 2 + Part 3)

12Total Part 3

280%iv) Vertical repetition of structure floor layout = 80%

290%iii) Repetition of floor height = 90%

4100%ii) 100% of windows complies to MS1064

4100%i) 100% door sizes complies to MS1064

Part 3: Other simplified construction solutions

Total Part 2 10.61.006,894

0.31x 0.6 x 20

=3.722,160/6,894 =0.310.62,160

ii) Tunnel formwork

Total length

= 120 m x 18 storey

0.69 x 0.5 x 20

=6.94,734/6,894 =0.690.54,734

i) Internal wall: precast blockwork

Total length

= 263 m x 18 storey

Part 2: Wall System

31.01.0013,421.4 m2Total Part 1

0.05 x 1.0 x 50

=2.5

706.4/13,421.4

=0.051.0706.4 m2ii) Roof truss - prefab steel

Roof area = 706.4m2

0.95 x 0.6 x50

=28.5

12,715 / 13,421.4

=0.950.6012,715 m2

i) Tunnel formwork system

Total area

= 706.4m2 x 18 storey = 12,715m2

Part 1: Structure Elements

IBS

SCORECOVERAGEFACTOR

AREA (m2) or

Length (m)ELEMENTS

Example 3

IBS Score For Project (Group Of Buildings)

PROJECT INFORMATIONS:

Main buildings in the development consist of 5 blocks of buildings. The

IBS score for each building are:-

i) Block A - 5 storey apartment

Construction area, QST (building)A = 3,000 m2

IBS Score(building A) = 83

ii) Block B - 5 storey apartment

Construction area, QST (building)B = 3,000 m2

IBS Score(building B) = 87

iii) Block C - 4 storey apartment

Construction area, QST (building)C = 3,200 m2

IBS Score(building C) = 35

iv) Block D - 4 storey apartment

Construction area, QST (building)D = 3,200 m2

IBS Score(building D) = 47

v) Block E - 3 storey office block

Construction area, QST (building)E = 3,000 m2

IBS Score(building E) = 75

Total construction area (block A + B + C + D + E ) = 15,400 m2

BlockConstruction

Area (m2)Coverage

IBS

Score(building)

IBS Score(project)

A 3,0003000 / 15400

= 0.19583 0.195 x 83 = 16.2

B 3,0003000 / 15400

= 0.19587 0.195 x 87 = 17.0

C 3,2003200 / 15400

= 0.2135 0.21 x 35 = 7.4

D 3,2003200 / 15400

= 0.2147 0.21 x 47 = 9.9

E 3,0003000 / 15400

= 0.19575 0.195 x 75 = 14.6

Total 15,400 1.0 65.1