Airport Capital Improvements: Developing a Cost-Estimating Model and Database (2014) / Chapter Skim
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Pages 8-23
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From page 8... ...
CHAPTER 3: FINDINGS AND APPLICATIONS This section describes key findings from the research project. The discussion is broken down into the findings from the background research, the data collection and model development, the model validation, and the user interface implementation.
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From page 9... ...
Table 1: Survey responses to "yes/no" questions Question Yes % Yes No % No N/A NR 4. Is construction cost estimation at your facility performed in-house?
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Fourteen respondents indicated that they perform in-house construction cost estimating, twelve of whom use software. Nine respondents noted that they utilize Microsoft Excel, and one each uses AASHTO's Trns•port Estimator, RSMeans, and Success Estimator.
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From page 11... ...
Data Collection and CER Development Limited data availability led the Research Team to request change to Phase II of the Amplified Work Plan to incorporate supplemental rounds of data collection and scale back the user interface development and software capabilities. After the completion of the supplemental efforts, the database consisted of 251 observations.
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Table 4: Final CERs Project Type Intercept (FY2014 KS $) Coefficient 1 Coefficient 2 Horizontal Projects Construct or rehabilitate taxiway 11.9 Pavement area (SF)
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Note that in the initial model specification, the project type "Install airport visual aid" was used. However the data collection did not result in enough observations to support CER development for visual aids other than the installation of PAPI systems.
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Figure 2: Predicted vs. actual cost – construct or rehabilitate taxiway $0 $5,000 $10,000 $15,000 $0 $5,000 $10,000 $15,000 Pr ed ic te d Co st (F Y 20 14 K S $k )
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Figure 3: Predicted vs. actual cost – construct, expand, or rehabilitate apron $0 $3,000 $6,000 $9,000 $0 $3,000 $6,000 $9,000 Pr ed ic te d Co st (F Y 20 14 K S $k )
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From page 16... ...
Figure 4: Predicted vs. actual cost – construct, extend, or rehabilitate runway $0 $3,000 $6,000 $9,000 $12,000 $0 $4,000 $8,000 $12,000 Pr ed ic te d Co st (F Y 20 14 K S $k )
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From page 17... ...
Figure 5: Predicted vs. actual cost – install perimeter fencing $0 $150 $300 $450 $0 $150 $300 $450 Pr ed ic te d Co st (F Y 20 14 K S $k )
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From page 18... ...
Figure 6: Predicted vs. actual cost – construct ARFF facility $0 $6,000 $12,000 $18,000 $0 $6,000 $12,000 $18,000 Pr ed ic te d Co st (F Y 20 14 K S $k )
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From page 19... ...
Figure 7: Predicted vs. actual cost – construct SRE building Another validation method conducted for this study was a case study analysis.
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From page 20... ...
Figure 8: Case study validation – difference between predicted and actual cost As a final step in the validation effort, the airport construction SMEs on the Research Team were asked to test the CERs against projects that they were currently involved in. The SMEs were also asked to compare the results of the cost model with their professional experience and familiarity with cost estimating for airport construction projects.
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From page 21... ...
4. Construction of 78,000 SF of taxiway pavement surface at a small regional airport: The model estimated the cost within 18%.
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From page 22... ...
The input window is shown in Figure 9 and contains four sections: (1) Contact information for the preparer; (2)
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From page 23... ...
Figure 10: ACCE cost estimate report 22
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