01658062

Component

Thermal loadings are essential factors in highway bridge design. Knowledge of average bridge temperature (ABT) is important for the prediction of axial bridge deformations during the seasonal temperature cycle. In this study, an on-site instrumentation program to measure the uniform thermal behavior in precast prestressed (PC/PS) high strength-self consolidating concrete (HS-SCC) girders was conducted at the A7957 Bridge on HWY 50, in Missouri, USA. Thermistors integrated within vibration wire strain gauges (VWSG) to record concrete temperature were installed in the bridge girders and the deck slab at specific points of interest. Data concerning temperature were monitored and recorded for over two years. The measured ABT (maximum and minimum) were compared to the design uniform temperatures recommended in the National Cooperative Highway Research Program (NCHRP) Report 276 and American Association of State Highway and Transportation Officials (AASHTO LRFD 2012) methods. The test results showed that these methods did not accurately reflect the extreme temperature measured in this study. A new approach (site-specific basis) was developed by the authors to provide more realistic design temperatures than current methods.

This paper was sponsored by TRB committee AFF30 Standing Committee on Concrete Bridges.

18-03538

English

14p

2018

Transportation Research Board 97th Annual Meeting

Digital/other

Figures; Photos; References; Tables

Bridge design; Bridges; Concrete structures; Girders; High strength concrete; Highways; Structural health monitoring; Thermal analysis

National Cooperative Highway Research Program (NCHRP) Report 276

Bridges and other structures; Design; Highways; Materials

Transportation Research Board Annual Meeting 2018 Paper #18-03538

TRIS, TRB, ATRI

Jan 8 2018 10:52AM