Verkehrsschwingungen bei Betonierarbeiten auf bestehenden Straßenbrücken: Schwingungsprognosen zur Bewertung von Bauzuständen im Zuge der neu errichteten Autobahnbrücke A 23 – Hochstraße Inzersdorf.

Traffic vibrations during concreting work on existing road bridges – Vibration prognosis for the assessment of construction stages in course of the newly constructed highway bridge A 23 – Hochstraße Inzersdorf The construction works on existing bridges must often take place without traffic interruptions. During bridge‐widening works or closing of construction joints, the hardening concrete is exposed to traffic‐induced vibrations. This can damage the material permanently, depending on the amplitude of vibration velocity. This study investigates factors that influence amplitude of traffic‐induced vibrations of a slab bridge on the A 23 motorway in Vienna, which was rebuilt in several construction phases. Transient dynamic simulations were used to analyze the influence of the driving speed, vehicle mass and road evenness. Measured road profile data, which were collected by high‐resolution laser scanning of the road surface, were used in FEM simulations. Bridge resonance properties were verified by vibration measurements. While bridge deflections and strains are mainly influenced by vehicle mass, the vibration velocities are primarily determined by the road profile. The predicted vibration velocities were compared to a limit value taken from the literature, the observance of which should not lead to any impairment of the young concrete. The results served as a decision basis for the selection of suitable measures during the critical hardening phase of the concrete in the connection joint. [ABSTRACT FROM AUTHOR]