非对称连续梁桥设计与施工

研究目的:针对桥位地形要求,研究不对称连续梁的设计特点和截面尺寸选择的方法,研究不对称连续梁合理的施工方法以保证梁体施工安全。研究方法:采用有限元程序对不对称连续梁进行施工阶段、运营阶段受力分析,选定梁体截面尺寸及梁体悬臂灌注施工顺序。研究结果:通过调整不对称连续梁边中跨梁高、截面尺寸,解决了不对称连续梁内力平衡,采用合理施工方法确保了不对称连续梁施工安全,并且满足了梁体线形要求。研究结论:根据桥位处要求及分析结果,大圆里双线特大桥主桥采用52 m 112 m 64 m不对称连续梁,最小边跨与主跨比仅为0.464,梁体曲线采用2种抛物线及不同梁高尺寸解决节段不平衡的问题,再以合理的梁体施工方法来保证施工安全。

Design and Construction of Asymmetric Continuous Beam Bridge

Research purposes: The purposes of this paper are to study the design features,the method of designing the section dimension and the reasonable construction technique for asymmetric continuous beam to guarantee the safety of construction of beam according to the requirements of topography of the bridge site.Research methods:By using 3D-FEM software,the analysis is made for pressure conditions of asymmetric continuous beam during construction stage and service stage,the section dimension of beam and the construction sequence for(cantilever) casting in place are designed.Research results:The problem of balance of internal force within beam can be solved by adjusting the beam height and section sizes of side span and main span of the asymmetric continuous beam,and the safety of construction of asymmetric continuous beam can be guaranteed and the requirement of liner for beam can be met by adopting reasonable construction method.Research conclusions:Based on the requirements of bridge site and the analysis result of the bridge,an(asymmetric) continuous beam with the main spans arranged as(52 112 64) m asymmetric spans is adopted to the main bridge of Dayuanli double line extra-long bridge.The ratio of minimum side span to main span was only 0.464,and the problem of segment unbalance can be solved by adopting two parabola for beam curve and two different heights of beam.In(addition),application of reasonable construction methods can guarantee the construction safety.