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Rao R.,Guangzhou University | Huang Y.-H.,Center for Monitoring Research | Liu A.-R.,Guangzhou Municipal Key Laboratory for Structural Safety and Health Monitoring
Applied Mechanics and Materials | Year: 2013

A method for the box girder's creep calculation considering the hydration heat is proposed and the effect of the hydration on the creep is discussed. The box girder is divided into several components and the average hydration temperature of the component is defined to represent the general condition resulted in the hydration. The formulae of the average hydration temperature have been recommended based on the discussion with respect to the formulae accuracy. The effect of the hydration on the creep is changed into that of the variable age of loading and the relationship between them is also given. It has been found that the hydration decreases the creep stress obviously. © (2013) Trans Tech Publications, Switzerland. Source


Rao R.,Guangzhou University | Rao R.,Center for Monitoring Research | Rao R.,Guangzhou Municipal Key Laboratory for Structural Safety and Health Monitoring | Huang Y.,Guangzhou University | And 6 more authors.
Yingyong Jichu yu Gongcheng Kexue Xuebao/Journal of Basic Science and Engineering | Year: 2014

A method is proposed to analyze the parameter sensitivities of the stochastic and multi-parameter system with consideration of the parameter variations. Through statistics, sampling, regression and correlation analysis, the effect of the dimension and the variation of parameters can be removed, while parameter sensitivities indexed by the path coefficient, the partial correlation coefficient and the accumulative sensitivity coefficient can be obtained. The sensitivities of five creep parameters, including the relative humidity of ambient atmosphere (RH), the theoretical thickness, the mean concrete compressive strength after 28 days (MCCS), the temperature and the age of the concrete at loading (ACL), were analyzed by the proposed method using 8585 samples measured and collected from 9 concrete bridge construction sites. A positive correlation was observed between creep coefficient and the temperature, while a negative correlation between creep coefficient and the rest parameters. Among the five creep parameters, RH was found to be the most highly correlated one, and the rest found to follow the order of ACL, the temperature, the theoretical thickness and MCCS. Besides, the time dependence of five parameters' sensitivities was studied and it was concluded time-independent. Source

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