Study on reliability of displacement response of high-speed railway bridge piers by new parallel roads
In order to study the time-varying impact of new parallel roads in soft soil areas on the displacement of existing high-speed railway piers,a three-dimensional finite element model was built based on a project of Shanghai—Nanjing—Hangzhou high-speed railway,and the parameter sensitivity analysis of pier displacement was carried out.The time-varying response surface method was used to obtain the correlation between pier displacement and soil parameters with high sensitivity coefficients.The probability distribution of pier displacement was calculated according to the response surface function,and the reliability probability of pier displacement was evaluated.The results show that the sensitivity coefficients of pier displacement to soil Poisson's ratio,rebound curve slope and critical state slope are larger.The relative error between the predicted value of high-speed railway pier displacement response surface function and the calculated value of finite element model is within 5%,and the predicted result of response surface function is reliable.With the increase of soil consolidation time,the maximum lateral displacement of bridge piers decreases continuously.After stabilization,the lateral displacement of most bridge piers remains within 2 mm.By fitting the finite element calculation results with time-varying response surface function,the calculation efficiency can be improved,and the reliability probability of the existing high-speed railway pier displacement considering the consolidation effect of soft soil can be obtained,which provides a more practical method for the prediction of similar pier displacement in the future.
万方数据
维普
