Short-Term Warning Modeling and Integrity Monitoring for Deformation of Engineering Structures

rt-term warning model is built on the analysis of the cumulative sum statistics.Then the relationship of the minimum warning deformation(MWD),the average run length(ARL) and the warning delay(WD) with respect to the warning threshold are presented.Based on these the definition of short-term warning model availability,false alarm rate and missed alarm rate are given.We build the integrity and the availability monitoring algorithm of the short-term warning system.According to the simulated deformation signal(μ0=0,σ=2),different early warning thresholds are computed to give the different false alarm rate.The results show that the model is able to give an effective short-term warning when the abrupt deformation or the slowly growing deformation are considered.At the same time,the short-term warning delay is related to the ARL.The model is successfully applied to the short-term warning of the field collected data,which provides an overall quality control for the establishment of short-term warning theory.