主桥顶升支座更换对变截面连续梁桥结构性能的影响分析

基于桥梁支座更换问题，利用桥博V3.2.0程序计算支座顶升对三跨变截面连续梁受力状态的影响，以保证梁体结构的安全。分析结果显示：梁体截面应力增量与顶升近似呈线性关系；顶升强迫位移10mm对梁体受力影响较小，最大增量为5.9%；且设置支座顶升最大强迫位移为10mm作为支座更换限制高度能保证梁体安全。

Influence of Jacking up of Main Bridge for Bearing Replacement on the Structural Peformance of Variational Continuous Beams

Based on bearing replacement of bridge,the finite element sofeware Dr.Bridge V3.2.0 was applied to calculate jacking up of bearing replacement influence on the structural peformance of variational continuous beams to ensure security of structure. The analysis results show that the section stress increment of beam body and bearing displacement of jacking up pesents a approximate linear relationship,the forced displacement of 10 mm has little influence on beam body and the largest increment was 5.9% ,forced displacement of 10 mm can be taken as limit height connidering the beam body safety.