Abstract
In construction field, a time completion and an adherence to budget are two factors that mainly influence the successful of the projects. The adherence to the budget can be achieved when the estimated budget is closed to the actual cost. For the owners, cost estimation is necessary as a guidance in determining the amount of investment. Therefore, it is very important to know the estimation of the project cost by using the limited data before the detailed plans and specifications of the project are identified. However, in the case of bridge substructure preliminary cost estimation, there is a lack information about material quantity estimation models due to the difficulties of soil characteristic and hydrological conditions. Hence, this research aims to develop the estimation of material quantity models of the abutment and caisson of bridge, with the Presetressed Concrete I-Girder (PCI Girder) superstructure located in Sleman district, Yogyakarta province, Indonesia. The database used for developing model was obtained by conducting sub-structure structural analysis of 15 abutments and 45 caissons. The bridges have a various span length, abutment height, and caisson depth. Material quantity estimation models were analysed by the multiple regression analysis methods. The span length and the abutment height are determined as independent variables to predict the concrete volume, the reinforcing steel weight, the caisson concrete volume, the cyclops concrete volume and the caisson reinforcing steel weight. This research proposed 11 equation models to estimate the concrete volume and reinforcing steel weight of abutment and caisson.
Highlights
In construction field, a time completion and an adherence to budget are two factors that mainly influence the successful of the projects (Fragkakis et al, 2015)
The relation of concrete volume Vc and reinforcing steel weight Vs to the bridge span L and the abutment height H can be seen in Equation 1 and 2, respectivelly
For the 4 m height caisson, the relation of concrete volume of the caisson Vcc, cyclops concrete volume Vcc and reinforcing steel weight Vss to the bridge span L and the abutment height H can be seen in Equation [3, 4] and 5, respectivelly
Summary
A time completion and an adherence to budget are two factors that mainly influence the successful of the projects (Fragkakis et al, 2015). Several studies on the cost estimation at an early stage of the projects have been conducted. Initial cost estimation of bridge construction was developed by Muis (1995) for reinforced concrete, truss and composite bridge structure. Et al (2010) conducted research on a cost estimate method for bridge superstructures using regression analysis and bootstrap. This study aims to develop the cost estimation model of the bridge superstructure of pre-stressed beams, box girders cast in place, and the balance cantilever box girder. Sulistyani (2014) conducted research on the model estimation of the volume and cost of patching on the pavement of provincial roads in Yogyakarta, Indonesia. Et al (2015) conducted research on the preliminary cost estimation model for culvert. The study aims to develop the cost estimation model using the previous project information
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