Strength Evaluation of Existing Reinforced Concrete Structuresby C. Y. Lin, Natl Taiwan Inst of Technology, Taiwan,
Abstract: The load test as described in ACI 318-83 Chapter 20, entitled 'Strength Evaluation of Existing Structures,' was conducted at 60%, 80%, and 100% of the calculated yield strength of the test specimen, in order to examine the behavior of the structure at various loading levels. Both step-load and cyclic-load methods with shortened duration periods were conducted to investigate the feasability of a simplified load test procedure in an effort to shorten the duration of the load test. Results indicate that stabilization of specimen deformation occurred within 10 minutes subsequent to the completion of load application when the applied load was less than the yield strength of the section. A significantly greater degree of specimen deformation due to the sustained load was observed as the applied load approached the yield strength of the specimen. Stabilization of specimen deformation did not occur within the 60 minute observation period.
Subject Headings: Load tests | Reinforced concrete | Load factors | Structural strength | Material tests | Existing buildings | Strength of materials | Structure reinforcement
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