Abstract: In order to study the deterioration performance of steel structure coating under the static load, temperature variation and sandstorm erosion, a static loading system for steel structure coating specimen was designed. Then the experiment research was carried out on the conventional and durable coating system of steel bridges by static loading, temperature control and the airflow spray method. The degradation of coatings under the coupling action of static load and temperature variation were tested by the pull-of test, and the coating damage modes of adhesion and cohesive were quantitatively measured. Combined with pull-of test and thickness measurement results, the dynamic deterioration process of coating resistance was obtained. The erosion resistance of coatings under the static load and temperature variation was studied by the airflow spray method, and the degradation process of coatings working performance under the coupling action of static load and environment was obtained based on the experimental results. The results show that the coupling effect of static load and environment makes the resistance of topcoat attenuate until its protective function is destroyed, the temperature variation causes coating materials transform to brittle materials, static load accelerates the dete-rioration rate of coating, and sandstorm erosion is going to strip coatings from the system. Then the coatings are deactivated successively since the coupling action cause the recession of system resistance, the coating system completely loses resistance and eventually peels off from the substrate. For the experimental coating systems, after 30 d of static load and temperature variation, the adhesion of coating decreased by 8.97%, the thickness, erosion amount and critical erosion angle increased by 25.3%, 46.15% and 17.4%, respectively.
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2024, Vol. 38 
