Relative Humidity Mapping and Its Application to The Analysis of Prestressed Losses For Prestressed Concrete Bridges in the Philippines

Aside from wind and seismic factors that can affect the bridges' serviceability, performance, anddurability, relative humidity also needs to carefully be considered in designing of bridges. The influence ofenvironmental relative humidity on concrete is mainly reflected in the movement of water in concrete andhas a certain influence on the properties of concrete (such as drying shrinkage and creep). In this study, theresearchers proposed a relative humidity map using a Quantum Geographic Information System (QGIS)that will be useful in the analysis of prestress loss to ensure the durability, safety, and economical reasonsof the prestressed concrete bridges in the Philippines. This study will help to better understand the effect ofrelative humidity in prestressed concrete bridges. After conducting the study, the research findings are thefollowing, the proposed map using QGIS software gives an accurate calculation of the long-term loss ofthe prestressed concrete, and the use of Weibull Formula and Microsoft Excel gives ease to determine thereturn levels presented in this study.