Experimental research on daily deformation monitoring of steel box girder bridge based on BDS/GPS

摘要

In order to investigate the feasibility of BDS/GPS in the deformation monitoring of long-span bridges, analysis and research on aspects like number of visible satellites , PDOP value and monito-ring precision are carried out .To analyze daily deformation characteristics of steel box girder bridge , observation data for 48 consecutive hours is computed by self-programmed software .Experiment re-sults show that the monitoring-points on the bridge demonstrate obvious periodicity and recoverability in vertical and horizontal directions , meanwhile , changes in the elevation direction are relatively sta-ble.The deformation-monitoring results of BDS/GPS combination system and GPS single system show good consistency .However , in a complex environment of the bridge , especially under the con-dition that satellite signals are severely affected , the advantages of BDS/GPS combination over GPS single system are more obvious .