Closure Jacking Force of Optimization Analysis of Multi-span Continuous Rigid Frame Bridge in Mountain Area
Closuring jacking force is an important factor affecting beam alignment of multi-span continuous rigid frame bridge in operation stage.Aiming at the problems of solving the optimal jacking force,such as large workload,inaccuracy and complexity,an optimal closuring jacking force solving method based on multi-objective linear programming theory was proposed.At the same time,a multi-span continuous rigid frame bridge is taken as an example background,and three different working conditions of no jacking,applying trial jacking and applying optimized jacking force are compared and analyzed.The comparative analysis results show that the stress and linear shape of the bridge can be closer to the design ideal state by applying the jacking force before closuring.Compared with the trial jacking force,the optimized jacking force can control the deviation of the pier top more effectively and improve the stress state of the whole bridge.In the process of solving the jacking force,the difference of the vertical horizontal displacement of pier top caused by the closuring temperature difference should be taken into account to correct the jacking force.And the relationship between the closuring temperature difference and the maximum displacement of pier top and the optimal closing thrust force is basically linear.
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