大跨度连续刚构施工中悬臂长度与变形的关系研究

以苍溪县嘉陵江二桥主桥为对象，利用Midas Civil对施工过程进行模拟，分析连续刚构桥悬臂施工中悬臂长度对结构线形的影响。研究发现悬臂结构在自重和预应力荷载作用下会发生变形，在忽略时间因素情况下，当悬臂长度较短时，预应力荷载对结构挠度的影响大于自重的影响，结构会上挠；随着悬臂长度的增加，自重对挠度的影响越来越大，当达到4/5最大悬臂长度时，结构变形由上挠变为下挠。

Research on Relationship Between Cantilever Length and Deformation in Long Span Continuous Rigid Frame Construction

Based on the second bridge of jialing river bridge in cangxi county, Midas Civil was utilized to simulate the process of construction and we analyzed the influence rigid frame's continuous length on structural line in continuous rigid frame bridge's construction, It is found that the cantilever structure will be deformed under the action of self weight and prestressing force.In the case of ignoring the time factor, if the cantilever length is short the structure will bend upwards.Because the influence of prestressed load on deflection is greater than that of self-weight. As the length of the cantilever increases, the influence of self-weight on deflection is increasing. When reached 4/5 of the largest cantilever length, the structural deformation is changed from the top to the bottom.