A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Influence of Temperature on Precast Bridge Girders
Precast concrete I-griders are commonly used by the Florida DOT to support short to moderately spanned highway bridges. These girders are subjected to daily and seasonal temperature variation during storage at precast yards. Thermal gradient over the depth of such girders can cause unwanted effects such as cracking, twisting or camber. This study was undertaken to investigate the temperature gradients and strains caused by differential temperature on precast girders. Types II, IV, V and VI AASHTO girders were instrumented with thermocouples and vibrating wire strain gages at a precast yard in two phases. Dataloggers were used to collect and store data over two week periods in summer and winter. Temperature and strain data were normalized with respect to the initial data. Data distributions over the depth and length of precast girders were developed. These distributions were compared with theoretical distributions from a computer program. It was found that the heat of hydration released soon after concrete casting in precast girders was significant during the first 24 hours.
Influence of Temperature on Precast Bridge Girders
Precast concrete I-griders are commonly used by the Florida DOT to support short to moderately spanned highway bridges. These girders are subjected to daily and seasonal temperature variation during storage at precast yards. Thermal gradient over the depth of such girders can cause unwanted effects such as cracking, twisting or camber. This study was undertaken to investigate the temperature gradients and strains caused by differential temperature on precast girders. Types II, IV, V and VI AASHTO girders were instrumented with thermocouples and vibrating wire strain gages at a precast yard in two phases. Dataloggers were used to collect and store data over two week periods in summer and winter. Temperature and strain data were normalized with respect to the initial data. Data distributions over the depth and length of precast girders were developed. These distributions were compared with theoretical distributions from a computer program. It was found that the heat of hydration released soon after concrete casting in precast girders was significant during the first 24 hours.
Influence of Temperature on Precast Bridge Girders
N. Yazdani (author)
1992
139 pages
Report
No indication
English
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