Identification method for fire damage of RC beams based on dynamic tests

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (11) : 121-131.

LIU Caiwei1, 2, MIAO Jijun1, 2, GAO Tianyu1, HUANG Xuhong1, GUO Xinyu1

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Abstract

Here, in order to acquire fire damage degree of RC beams, a new damage identification method based on wavelet neural network (WNN) was proposed taking the equivalent fire time as the damage index. Firstly, a fire damage identification method for a simply supported beam was established and verified with numerical simulation. Then, a new 3-step positioning method was established for fire damage of RC continuous beams, and it was described in detail taking a 3-span continuous beam as an example. Finally, 4 full scale RC beams (L1—L4) were designed, fire tests were conducted for L1—L4 within 60 min, 90 min, 120 min and 150 min, respectively, and after firing their load-bearing capacities were tested. These beams’ structural modal features before and after firing as well as their load-displacement curves after firing were measured. Based on L1—L4 modified refinement models, input parameters of WNN were constructed based on L1—L4 first 2 orders incomplete modal information, respectively and their corresponding equivalent fire times were taken as output parameters of WNN to do L1—L4 damage recognitions. The results showed that the actual measured values agree better with the predicted ones using WNN, so the reliability of the proposed method is verified.

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reinforced concrete beams / damage identification / wavelet neural network （WNN） / dynamic test / fire test

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LIU Caiwei1, 2, MIAO Jijun1, 2, GAO Tianyu1, HUANG Xuhong1, GUO Xinyu1. Identification method for fire damage of RC beams based on dynamic tests[J]. Journal of Vibration and Shock, 2019, 38(11): 121-131

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