Reliability evaluation of historic stone-arch bridge structure based on non-destructive testing and probability
Due to the characteristics of Chinese historic stone-arch bridges,such as long age,complex struc-ture,open air protection environment and uncertain parameters,it is difficult to accurately evaluate the ac-tual structural response of the historic stone-arch bridges by the traditional structural stability analysis methods.A novel non-destructive testing technology and probability-based structure reliability evaluation method for historic stone-arch bridges is proposed.Firstly,non-destructive testing technology and engineer-ing geology analogy method are used to obtain physical and mechanical parameters of stone-arch bridge structure and then a numerical model is established.Then based on the non-detection data or engineering geology manual,the sensitivity analysis method is used to determine the key parameters that have a greater impact on the overall structural response of the stone-arch bridges,that is,the first type of key parameters,and different sampling methods are proposed to generate random samples according to parameter prior dis-tribution to realize the Bayesian update process.Finally,the response of the bridge structure is analyzed by ANSYS software,and the reliability index of stone-arch bridges is calculated by the reliability method,and the relative standards are compared to evaluate the safety of the stone-arch bridge structure.Taking the simplified model of Zhaozhou Bridge of Sui Dynasty(big stone bridge),a national key cultural relic protec-tion unit,as the research object,the reliability value calculated by this evaluation system is 3.42,and the bridge safety grade is second level.The evaluation results are basically consistent with the actual situation,thus verifying the reliability and feasibility of the proposed method.The method can avoid the damage to the cultural relics of historic stone-arch bridges caused by the traditional physical and mechanical detection process,and the selected key parameters are reasonable and the uncertainty of observation and model pa-rameters is fully considered in the data updating processing,so as to calculate the reliability index of histor-ic stone-arch bridges more accurately,which can provide a scientific basis for the preventive protection of cultural relics of heritage buildings.
万方数据
维普
