Optimal Measurement of Static Displacements in Managing Construction Quality of a cable-stayed bridge

초록

When a deck segment is added to a cable-stayed bridge during its construction, cables are attached to the deck and cable tension forces are usually adjusted at a limited number of cables to fit to the target configuration. The quality of the construction is examined by measuring static displacements along the deck before and after adjusting cable tension forces. Therefore, the construction quality may be dependent on the number and locations of measurements and also on those of cables adjusted. The paper presents two algorithms of selecting an optimal number and locations of measurements of static displacements during the construction of a cable-stayed bridge. The paper applies both of the Fisher Information Matrix (FIM) formulated with the displacement sensitivities and that with the measured displacements. Simulation studies have been carried out to examine the efficiency and reliability of the proposed algorithm with respect to the number and locations of measurements. The error analysis has been carried out together with the number and locations of cables to be adjusted. The effects of measurement noise and manufacturing error in the cable length on the adjustment of cable tension forces are evaluated statistically by applying the Monte Carlo scheme.