Research Article

Study on Complexity of Precast Concrete Components and Its Influence on Production Efficiency

Table 6

Complexity index measurement of PC components.

First-level indexSecond-level indexIndex measurement methodUnit

Structural complexity D1Surface-to-volume ratio F11Ratio of surface area to volume of a component%
Number of openings F12Number of openings in a componentPiece
Reinforcement ratio F13Ratio of longitudinal rebar’ area to effective area in a component’s cross section%
Number of embedded parts F14Total number of embedded parts in a componentPiece
Amount of exposed rebar F15Weight of rebar exposed of a componentkg

Production complexity D2Material consumption F21Consumption cost of rebar, concrete, and embedded parts for a component1000 RMB/m3
Mold assembly time F22Average time required to assemble molds of a componentmin/m3
Mold manufacturing accuracy F23Average error of mold precision tests for a componentmm
Waiting time in production line F24Average waiting time in all production processes for a componentmin
Abnormal production status F25Average frequency of abnormal status during the production for a component (such as mechanical equipment failures and water and power outages)Time

Management complexity D3Operating proficiency of workers F31Average working years of first-line workers of a componentYear
Mold turnover rate F32Average time duration for the mold to be used onceDay/time
Delivery delay F33Average delivery delay time of a componentDay
Repair rate F34Number of components needing repair per 100 pieces of the component due to quality issues%
Degree of automation of production line F35Ratio of mechanized operation procedures to total procedures of a component%
Information management level F36Timeliness and accuracy of information transmission for a component, which is divided into five levels: low, comparatively low, normal, comparatively high, and high2, 4, 6, 8, and 10