不等跨混凝土连续梁顶推施工关键参数合理取值

针对不等跨混凝土连续梁顶推施工,围绕梁体跨越主跨过程中的结构受力状态,应用力法分阶段建立平衡方程,分析主梁边主跨比、导梁长度与主梁主跨跨径之比、导梁与主梁刚度比、导梁与主梁线质量比等关键参数对主梁前端支点和导梁根部受力的影响规律,并结合理论研究成果,指导实际工程关键参数的取值。研究结果表明:在导梁与主梁线质量比处于常规值0. 08～0. 12时,主梁边主跨之比应处于0. 6～0. 7,导梁长度与主梁主跨跨径之比应处于0. 67～0. 78,导梁与主梁刚度比可处于0. 1～0. 2。

Rational Key Parameters for Incremental Launching Method of Unequal Span Concrete Continuous Girder

The engineering background was the incremental launching of unequal span concrete continuous girder.The mechanical performances were analyzed when the girder was launched across the main span.The equilibrium equations were built with force method at different stages.The effects of a few key parameters on the mechanical performances of the front support of the main girder and the rear part of the guidance girder were investigated.These parameters include the length ratio of side span to main span,the ratio of guidance girder length to main span length,the stiffness ratio of guidance girder to main girder,and the linear mass ratio of guidance girder to main girder.With the analysis and the theoretical research achievements,rational values of the key parameters were suggested.The results show that when the linear mass ratio of guidance girder to main girder is 0.08~0.12,the length ratio of side span to main span should be 0.6~0.7,the ratio of guidance girder length to main span length should be 0.67~0.78,and the stiffness ratio of guidance girder to main girder should be 0.1~0.2.