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摘要
This paper presents the effects of instantaneous live load on the performance of partially cracked axial concrete members (representing on-site damage) subjected to cold region environments. A total of 5,289 constructed bridges in the state of North Dakota are analyzed to identify critical attributes. The environments simulated consist of 100 cycles of freezing-submerging-drying at a freezing temperature of -30 degrees C. The instantaneous live load effects are 20%, 40%, and 60% of the concrete compression strength at 28 days. A combined experimental and numerical investigation is conducted to examine the behavior of conditioned concrete cylinders. The research reports that the environmental effects are critical on the performance of existing concrete members in cold regions, and the presence of live load accelerates the deterioration of concrete. Internal damage attributable to the load cycling affects the axial stiffness and crack propagation of the conditioned concrete. All cylinders show volumetric contraction until failure occurs, followed by abrupt dilatation at failure. The live load effects influence the strain energy density and ductility of the concrete. A regression line to predict the strength degradation of the conditioned concrete is compared with numerical models. DOI: 10.1061/(ASCE)CF.1943-5509.0000221.
- 出版日期2012-8
