Abstract. The increasing data rate of actual laser scanners qualifies these sensors for kinematic applications. In case of surveying static environments the scanner can be integrated into a moving platform system. Therefore two main tasks are outstanding. Position and orientation of the platform have to be registered throughout a freely driven trajectory. The second challenge is to synchronize the scanned spatial data with the time scale of the positioning unit. This paper presents the specification of a mobile mapping system using a phase-based laser scanner with a hybrid INS (Inertial Navigation System)/GPS solution. Among a description of the system structure it includes a software-based method to synchronize the scanned profiles with the trajectory. No extra hardware unit for time registration of scanned profiles is required. After all a spatial comparison of independently observed control points allows the assessment of the system performance.
Die zutreffende Abbildung der Einwirkungen auf ein Tragwerk durch geeignete Lastmodelle ist eine wichtige Voraussetzung für dessen Zuverlässigkeit und Dauerhaftigkeit. Bei Brückenbauwerken sind insbesondere die Lastmodelle der Straßenverkehrseinwirkungen einem ständigen Wandel unterlegen. Dies macht den regelmäßigen Abgleich der Lastmodelle auf das aktuelle Verkehrsaufkommen notwendig. Das Verkehrsaufkommen lässt sich durch unterschiedliche Arten von Weigh‐In‐Motion‐Systemen ermitteln und durch numerische Untersuchungen erweiternd beschreiben. Der Schwerpunkt dieses Beitrags liegt in der Darstellung des kombinierten Einsatzes von direkten Messungen am Bauwerk sowie in der Anwendung laserbasierter Messmethoden aus dem Bereich der Ingenieurgeodäsie zur Kalibrierung eines Finite‐Elemente‐Rechenmodells (FE‐Modell), das der numerischen Untersuchung des aktuellen wie auch des prognostizierten Verkehrsaufkommens dient.Mapping of real impacts on a structure by acceptable load models is a fundamental assumption for its reliability and durability. Especially for road bridges traffic load models are affected by increasing traffic loads. This needs a periodical calibration of the load models to the actual traffic volume, which can be achieved by different ways of Weigh‐In‐Motion‐Systems and numerical investigations. The main focus of this article is in the presentation of a combined application of structural measurements and laser based geodetic measurements to calibrate a numerical model. This model allows a numerical investigation of the actual traffic volume and predicted traffic loads.
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