Environmental Impacts of Multi-Storey Buildings Using Different ...
Environmental Impacts of Multi-Storey Buildings Using Different ... Environmental Impacts of Multi-Storey Buildings Using Different ...
- 90 -• Wall and column to foundation attachment.• Beam attachment.• Timber / concrete composite flooring systems and floor attachment.• Splicing of wall and column members.• Post tensioning.Further details are provided in the referenced Masters thesis.7.2 Construction Method of Concrete BuildingThe construction of the alternative Concrete building would proceed in a similar manner tothat of the Timber building, as both consist largely of prefabricated members. The same‘section’ construction technique will be adopted. The major variation between the twobuildings is that the wall and columns of the Concrete structure are only of a single storey inheight, meaning that platform construction rather than balloon construction will take place.Figure 7.3 shows the assembly of this structure.Figure 7.3: Construction of pre-cast concrete case study building7.3 Construction Time AnalysisThe time taken on a construction project can have a considerable effect on the feasibility of agiven project. Therefore, one of the key performance indicators of any construction system isthe overall construction time. With this in mind, the time taken to assemble the case study
- 91 -buildings has been analysed and compared. Arrow International Ltd., Project ManagementConsultants, was consulted to ensure the construction scheduling for both case studies areestimated with reasonable accuracy.Some assumptions had to be made in order to predict the necessary time needed. Theseassumptions are listed below:• Column and wall members will take one hour to erect after arrival onsite.• Beam members will take half an hour to place after arrival onsite.• Flooring units will take twenty minutes to place after arrival onsite.• The floor topping will be undertaken in two pours, each taking one day.• Architectural fit-out will not be considered for either building.• Available personal onsite will not limit construction time.The buildings are divided into sections in order to increase rapidity of construction. Using thisinformation Gantt charts of the proposed construction sequence were developed for both theConcrete (Figure 7.4Figure 7.4Figure 7.4) and Timber buildings (Figure 7.5).From Figure 7.4Figure 7.4Figure 7.4 and Figure 7.5 above it can be seen that the overallconstruction time for the Concrete building is 67 days and 69 days for the Timber building.The first floor of each structure take the longest time as the foundations must cure adequately.It can be seen that the sub-structure work takes almost one third of the time of construction ineach building. On completion of the first level, the rapidity of pre-fabricated construction isevident. Each level of both structures takes approximately 15 days to complete.The major point of difference between the two buildings is the method of construction used.The use of the balloon construction method means that the Timber structure only placesvertical members in two lifts during construction, compared to the Concrete structure whichmust place wall and column members at each floor. The Concrete assembly negates this issueby using pre-fabricated members containing both column and beam elements, and as lessmembers are required on each floor, a similar time can be achieved.A direct comparison between the two construction times shows little difference in timemeaning that comparable construction times can be achieved with the proposed posttensionedtimber construction.
- Page 39 and 40: - 39 -Several different solutions h
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- Page 51 and 52: - 51 -6 Life Cycle Assessment6.1 In
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- Page 57 and 58: - 57 -For more information see:http
- Page 59 and 60: - 59 -6.3.3 Inventory Analysis6.3.3
- Page 61 and 62: - 61 -Table 6.2: Net tonnes CO 2 eq
- Page 63 and 64: - 63 -Growing timber takes up CO 2
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- Page 67 and 68: - 67 -8000700060005000GWP (t CO2 eq
- Page 69 and 70: - 69 -As explained above, carbon st
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- Page 73 and 74: - 73 -Table 6.9: Total GWP of each
- Page 75 and 76: - 75 -8,0007,0006,0005,000GWP (t CO
- Page 77 and 78: - 77 -45000400003500030000GWP (kg C
- Page 79 and 80: - 79 -assumed to be identical for t
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- Page 83 and 84: - 83 -Table 6.16: Green Star result
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- Page 101 and 102: - 101 -example, removal of CCA trea
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- Page 105 and 106: - 105 -9 Discussion9.1 The Building
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- Page 123 and 124: - 123 -10 ConclusionsThe following
- Page 125 and 126: - 125 -building types, instead subs
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- Page 137 and 138: - 137 -C O N C R E T E B U I L D I
- Page 139 and 140: - 139 -S T E E L B U I L D I N Gm m
- 90 -• Wall and column to foundation attachment.• Beam attachment.• Timber / concrete composite flooring systems and floor attachment.• Splicing <strong>of</strong> wall and column members.• Post tensioning.Further details are provided in the referenced Masters thesis.7.2 Construction Method <strong>of</strong> Concrete BuildingThe construction <strong>of</strong> the alternative Concrete building would proceed in a similar manner tothat <strong>of</strong> the Timber building, as both consist largely <strong>of</strong> prefabricated members. The same‘section’ construction technique will be adopted. The major variation between the twobuildings is that the wall and columns <strong>of</strong> the Concrete structure are only <strong>of</strong> a single storey inheight, meaning that platform construction rather than balloon construction will take place.Figure 7.3 shows the assembly <strong>of</strong> this structure.Figure 7.3: Construction <strong>of</strong> pre-cast concrete case study building7.3 Construction Time AnalysisThe time taken on a construction project can have a considerable effect on the feasibility <strong>of</strong> agiven project. Therefore, one <strong>of</strong> the key performance indicators <strong>of</strong> any construction system isthe overall construction time. With this in mind, the time taken to assemble the case study