ABSTRACT
In this contest, bridge A7957 was designed and erected on HWY 50, Missouri State, USA, for in situ investigative studies to evaluate strains and stresses over different stages taken into account the effect of prestress losses. The bridge was designed with a concrete mixture of different mechanical and rheological properties. High strength concrete, high strength-self consolidating concrete and normal strength-self consolidating concrete were used to construct bridge girders. The bridge girders were instrumented with vibration wire strain gages to monitor the strains from concrete casting stage to the service life. The measured stresses (from strain readings) were compared to design limitation adopted by ACI 318-14. Based on the analysis of the test results, the measured compressive stresses at mid-span bottom fiber are higher than design compressive stresses for all the beams at release stage. Also, there are no substantial changes in the compressive strain level after 300 days.
