Fuzzy random finite element reliability and sensitivity analysis of reinforced concrete outer shaft lining structure in deep alluvium

Based on the basic principle and method of fuzzy random finite element,the structural failure function and material constitutive relation were blurred equivalently. Setting the input and output of fuzzy random variables,the fuzz- y random finite element analysis model of reinforced concrete structure of outer shaft lining was established. The AN- SYS was used to calculate the fuzzy random finite element reliability of shaft lining structure. The results show that the fuzzy random finite element reliability is generally low compared with the conventional finite element reliability for the consideration of uncertainty of variable parameters,thus it better reflects the engineering conditions. In addition,the fuzzy random finite element reliability with the characterization of interval value is more reasonable than the conven- tional reliability method of fixed value manifestation. Fuzzy random sensitivity analysis manifests that the important in- fluencing factors to outer shaft lining structure reliability are in accordance with the order of shaft freezing pressure, concrete compressive strength and thickness to diameter ratio. The ANSYS sensitivity scatterplot can indicate the influence relationship of main input variables to output variables,and the general range of variables change.