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《Journal of Building Structures》 2004-01
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Experimental study on mechanical properties of long standing concrete after exposure to high temperature

LU Tianqi1, ZHAO Guofan2, LIN Zhishen3 (1. Department of Hydraulic and Hydropower Engineering, Tsinghua University, Beijing 100084, China; 2. School of Civil and Hydraulic Engineering, Dalian University of Technology, Dalian 116024, China; 3. National Engineering Technology Research Center of Industrial Building Diagnosis and Rehabilitation, Beijing 100088, China)  
After high temperature, cooling and then standing for a certain length of time, the main mechanical properties of concrete will be changing along with standing time. Based on a lot of tests, in consideration of the influential factors, including fire temperature,cooling, curing process and standing time etc., the regularities of variation of compressive strength, elastic modulus and stress strain relationship of standing concrete along with above mentioned factors were studied. The empirical formulas, which can be easily used for predicting mechanical indexes, are given by regression on the test results. The standing time corresponding to lowest compressive strength of standing concrete after high temperature had been analyzed. The proper time for strengthening concrete structure after fire is suggested. The study shows that the mechanical properties of the concrete have obvious transformation, and the study results offer a theoretic basis for appraisement of concrete structure after fire.
【Fund】: 中国工程建设标准化协会《火灾后建筑结构可靠性鉴定标准》编制基金资助((98)建标协字第08号);; 冶金部建筑研究总院科研基金资助(99024)。
【CateGory Index】: TU375
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