An Experimental Study on Relationship between Nonlinear Resonance Vibration and Tensile Strength of Fire-damaged Concrete

摘要

This research concentrates on the experimental study for evaluating residual material property of fire-damaged concrete using nonlinear resonance vibration. Nonlinear resonance vibration was performed to measure the hysteretic nonlinearity parameter, which is a damage indicator and sensitively reflects degree of fire-damage. Material property, tensile strength, was obtained by splitting tensile strength test of thin disk-shape samples. Splitting tensile strength test was conducted on thin disk-shaped concrete samples, which were exposed to various conditions, including different high temperatures. Upon on the test results, the correlation study proposed a regression equation, which indicates the possibility to evaluate the residual material property from measurement of the hysteretic nonlinearity parameter.