客家大桥体系转换过程中悬臂端挠度变化的影响因素分析
发布时间：2018-07-26 13:13
【摘要】：为解释客家大桥在体系转换施工过程中结构悬臂端向下的挠度出现先增大后减小这一现象的根本原因,采用Midas-civil有限元软件建立了该桥梁结构模型用于计算,并利用因素分析法和叠加原理等方法进行了系统的分析。发现:连续梁桥在边跨合龙后,拆除悬臂使用临时支承结构的施工过程中,因先拆除的部分临时支承结构优先退出体系,不再参与受力;结构支座支反力重新分配,永久支座与另一半未拆除的临时支座受力大小发生改变;体系转换过程中的结构墩梁连接处实际支点的位置发生变化、永久支座开始受力后产生弹性压缩变形以及边跨和龙段区域内预应力作用产生的上拱效应等因素使得结构悬臂端的挠度发生变化,其单独作用的效果各不相同,而支点位置移动造成的悬臂长度先增大后减小是出现上述工程现象的根本原因。通过一组对比模型计算得出的理论数据,绘制了相应的曲线图。通过观察曲线图的变化趋势,总结出临时支墩与永久支座的距离对悬臂端挠度以及支座反力影响的规律,同时拟合出相关的数学函数。通过上述分析过程,总结研究成果,得出结论,并结合相关参考文献,提出对同类桥梁施工中选用临时支座方式、计算桥梁施工预拱度以及桥梁施工监控等具有一定的指导意义的建议。
[Abstract]:In order to explain the fundamental reason why the downward deflection of the cantilever end of the Hakka Bridge increased first and then decreased during the construction of the system transition, the bridge structure model was established by using the Midas-civil finite element software for calculation. The method of factor analysis and superposition principle is used to analyze systematically. It is found that in the construction process of removing the cantilever with temporary support structure after the closure of the side span, the partial temporary support structure that was removed first takes precedence out of the system and no longer takes part in the force, and the reaction force of the support of the structure is redistributed. The force size of the permanent support and the temporary support which is not removed by the other half is changed, and the position of the actual fulcrum in the connection of the structure pier and beam during the system transition is changed. The deflection of the cantilever end of the structure is changed due to the elastic compression deformation of the permanent support and the effect of the upper arch caused by the prestressing action of the side span and the region of the long section after the permanent support is subjected to the force, and the effect of the single action is different. The length of the cantilever caused by the shift of the fulcrum first increases and then decreases, which is the root cause of the above engineering phenomenon. Through a set of theoretical data calculated by comparison model, the corresponding curves are drawn. By observing the changing trend of the curve, the influence of the distance between temporary pier and permanent support on the deflection of the cantilever end and the reaction force of the support is summarized, and the relevant mathematical functions are fitted. Through the above analysis process, summarize the research results, draw a conclusion, and combined with the relevant references, put forward the choice of temporary support in the construction of similar bridges, Calculation of pre-arch degree of bridge construction and bridge construction monitoring and control have certain guiding significance.
【作者单位】： 武汉理工大学土木工程与建筑学院;
【基金】：国家自然科学基金项目(51278183)
【分类号】：U445.4
本文编号：2146122
[Abstract]:In order to explain the fundamental reason why the downward deflection of the cantilever end of the Hakka Bridge increased first and then decreased during the construction of the system transition, the bridge structure model was established by using the Midas-civil finite element software for calculation. The method of factor analysis and superposition principle is used to analyze systematically. It is found that in the construction process of removing the cantilever with temporary support structure after the closure of the side span, the partial temporary support structure that was removed first takes precedence out of the system and no longer takes part in the force, and the reaction force of the support of the structure is redistributed. The force size of the permanent support and the temporary support which is not removed by the other half is changed, and the position of the actual fulcrum in the connection of the structure pier and beam during the system transition is changed. The deflection of the cantilever end of the structure is changed due to the elastic compression deformation of the permanent support and the effect of the upper arch caused by the prestressing action of the side span and the region of the long section after the permanent support is subjected to the force, and the effect of the single action is different. The length of the cantilever caused by the shift of the fulcrum first increases and then decreases, which is the root cause of the above engineering phenomenon. Through a set of theoretical data calculated by comparison model, the corresponding curves are drawn. By observing the changing trend of the curve, the influence of the distance between temporary pier and permanent support on the deflection of the cantilever end and the reaction force of the support is summarized, and the relevant mathematical functions are fitted. Through the above analysis process, summarize the research results, draw a conclusion, and combined with the relevant references, put forward the choice of temporary support in the construction of similar bridges, Calculation of pre-arch degree of bridge construction and bridge construction monitoring and control have certain guiding significance.
【作者单位】： 武汉理工大学土木工程与建筑学院;
【基金】：国家自然科学基金项目(51278183)
【分类号】：U445.4
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