不同合龙方式对多跨刚构-连续梁组合体系梁桥施工监控的影响分析

The Influence Analysis of Different Closure Ways on Construction Monitoring of Multi-span Rigid-frame Continuous Beam Composite System Beam Bridge

长联多跨刚构-连续梁组合体系桥梁结构及受力复杂,不同合龙顺序对施工过程中结构成桥累计位移和内力影响很大,以一联(82.68+4×152+82.8)m刚构-连续梁组合体系桥梁为例,采用有限元法计算分析4种不同的合龙方式对施工阶段主梁位移及内力的影响,并分析合龙口两端产生位移差值的原因,施工中可通过分批、分阶段施加预应力来降低位移差值,以减小施工监控的难度。并综合从桥梁施工监控线形、应力以及工期等方面考虑,指出本类型桥梁合理的施工顺序。

Taking a multi-span rigid-frame continuous beam composite system bridge as an example, using the finite element calculating method, this paper analyzed the influence of four different ways of closure on the main beam displacement and internal force in the construction stage.It also analyzed the reasons of the displacement difference at both ends of the final closure.Comprehensively from the bridge construction monitoring linear, stress and time limit, it pointed out the reasonable construction sequence of this type of bridge.