CIVL202 Construction Engineering I

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CIVL202Construction Engineering I

• Tutorial 8
• T1 Mon 1100 1150
• T2 Wed 0900 0950

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Tutorial Outline

• Developing WBS
• Cost control
• Bar chart
• Scheduling network

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Developing WBS

• The definition of WBS is the progressive
  hierarchical break-down of the project into
  smaller pieces to the lowest practical level to
  which cost is applied.
• The aim of WBS is extremely useful in developing
  both cost and time (schedule) plans to monitoring
  and controlling a project.
• We can think about that Why was Construction
  Project Management developed?

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Developing WBS

• In establishing the WBS, the following guidelines
  need to be considered
• Be clearly separated from other work packages.
• Each work package must have unique starting and
  ending dates.
• Each work package should have its own unique
  budget.
• Work packages should be small enough that precise
  measurement of work progress is possible.
• Maybe these points can be comprehended in
  Construction Project completely.

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Determining Sequence of Work packages

• Activity is the work elements which appear in the
  schedule in their expected sequence or logical
  order.
• The criteria of arranging the work packages
  sequence for time control
• Location
• After completing the structure frame of the first
  floor of a building before beginning the second.
  This is a physical constraints.
• Material
• The building structure isnt erected until the
  foundation of a building have reached sufficient
  strength. This is a physical constraints.

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Determining Sequence of Work packages

• Method of construction technology
• This is a technology constraint. Different
  technologies have different sequences.
• Required resources
• If the Required resources cant be gotten, the
  sequence must be changed.

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Cost Control Related to WBS

• Procedure of cost control
• Develop bid estimate.
• If bid is accepted, develop contract budget based
  on major work items.
• Measure actual cost on project.
• Compare actual costs with control budget.
• Take corrective actions ( measurement of reducing
  cost).
• If cant complete the project, could revise
  contract budget.

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Cost Control Related to WBS

• Code of account is a template or guide in
  defining and cataloging the cost centers within a
  project.
• Cost coding system utilize a numerical or
  alpha-numerical labeling which is a multi-level
  or hierarchical in nature, just to be consistent
  with WBS.

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Cost Control Related to WBS

• A typical cost type might define
• (1) the project designator
• (2)area of work
• (3)work discipline( e.g. civil, mechanical,
  electrical, etc.)
• (4) the trade specialty required.
• A cost coding system need to be handled by
  computer easily.

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Attention

• The WBS provides a rigorous way to quantify,
  define, measure, and control the work packages of
  a given scope of work.
• Other plans can be developed based on the WBS.
• Procurement plan
• Safety plan
• Quality plan
• ..

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Bar Chart

• Bar chart the representation of a project work
  item/activity as a time scaled bar whose length
  represents the planned duration of the activity.
• Length of the bar has two meanings
• Its physical length represents the planned
  duration of the work activity.
• The bar provides a proportionally scaled baseline
  to plot at successive intervals the correct
  percentage complete.
• By using different shading patters, bar chart can
  indicate monthly progress toward physical
  completion of work activities.

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Bar Chart

• A bar-net is a updated bar chart.
• MS-Project-XP P3 and so on can draw the
  bar-net.

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Scheduling Network

• In order to develop a schedule, the logical
  sequences that relates various activity to on
  another must be developed.
• Logical modeling rationales
• Adjacency of contact modeling
• Physical structure order modeling
• Physical construction order modeling

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Scheduling Network

• A scheduling network of nodes and links
• The node may represent events in time or an
  activity depending on the notation.

Activity name
A
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The duration time
A, Node to present and event
B, Node to represent an activity
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Scheduling Network

• Activity on node means that a network of
  activities is shown in which nodes represent the
  activities and arrows represent the sequences or
  relationship of the activity to one another.
• Activity on Arrow means that a network of
  activities is shown in which nodes represent
  events in time and arrows represent activities.

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Scheduling Network

• Dummy Activity
• 1,Maintain logic sequence
• 2,Maintain specific activity
• 3,Zero duration.