Abstract
A biaxial compression Hopkinson bar set-up bas been designed. It consists in a projectile, an input bar and two co-axial output bars. After the projectile impact on the input bar, the internal output bar measures the axial loading of the cross sample whereas the external output bar measures its transversal loading via a mechanism with sliding surfaces. Gauges glued on the bars enable stain measurements which lead to the forces and to the displacements on the interfaces between the bars and the mounting. The displacement field of the sample is obtained by high-speed imaging and by digital image correlation. Experiments show that the set-up works despites two disadvantages. Firstly, the transversal force in the sample is over-estimated because of the friction in the mechanism. Moreover, comparisons between the displacements on the bars interfaces and the sample displacement field display that the clearance have an influence on the sample loading.
Highlights
Under the coupling of environment and load, the long-term performance of the bridge structure is deteriorating
Limited by the experimental conditions and ability, the present researches are mostly focused on the natural environment exposure tests and artificial environment acceleration tests for materials and components
Aiming to the service environment conditions and load characteristics of the bridge structure, an artificial acceleration test system was developed for the coupling effect of the bridge structure environment and load, and an artificial acceleration test method was proposed under the coupling of multi-factor environment and random load
Summary
Under the coupling of environment and load, the long-term performance of the bridge structure is deteriorating. Few studies have been carried out on the combined effects of environment and loading on the bridge structures. The reason why the combined effects of the structure on the coupling of the environment and the load are rarely achieved is attributed to the limitations of the test equipment system. Corporation has developed a simulation system for the damp-heat-vibration integrated environment, which realizes the coupling of temperature, humidity, and narrow-band with regular spectrum random loads. In China, the environmental chamber in Central South University can simulate the coupling of temperature, humidity, acid/alkali salt/atomization, rain shower and constant amplitude cycle. South China University of Technology has developed wet heat, temperature-salt spray, rain shower and dynamic load coupled loading system. It is necessary to develop an artificial acceleration test system with coupling the environment and load for bridge structures
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