基于实时应变监测信息的钢筋混凝土梁有效疲劳应力参数值模型

为获得反映钢筋混凝土梁真实响应状态的疲劳应力值,提出基于实时应变监测信息的有效疲劳应力参数值模型.鉴于实时应变监测数据的周期循环特性,将其处理为标准循环块,采用低高频运算实现结构真实数据的提取;基于"傅里叶转换"进行转换分析及真实性验证,获得真实的应变数据.基于动态应变标准循环块特征,在随机波形应力峰值统计时只考虑主要...

Effective fatigue stress parameter model of reinforced concrete beams based on real-time strain monitoring information

In order to obtain the fatigue stress value reflecting the real response state of reinforced concrete beams, an effective fatigue stress parameter value model based on real-time strain monitoring information was proposed. In view of the cyclic characteristics of real-time strain monitoring data, it was simplified into standard cyclic blocks. Low-frequency and high-frequency operations were carried out to realize the extraction of real structural data. Based on “Fourier transform”, the transformation analysis and authenticity verification were carried out, and the realstrain data was obtained. Based on the characteristic of dynamic strain standard cyclic block, the main peak value was only considered in the statistic of random wave stress peak value, the material ratio limit was used as the starting point of reading instead of the mean line. The true fatigue stress characteristic value ofbeams could be obtained by transformation. Without affecting the fatigue damage of beams, based on the principle of strain energy and damage equivalence, the variable-amplitude stress spectrum was converted into the equivalent fatigue stress spectrum. Finally, the “real-time state analysis model” for evaluating the current damage status of beams and the “predictive trend analysis model” for predicting the later damage status of beams were established.