挂篮悬浇与大节段支架现浇方案对比分析

研究目的:以往对挂篮悬臂浇筑法和大节段支架现浇法两种施工方案的比较仅仅停留在工期及施工成本,而忽略了结构的受力差异。本文分别模拟挂篮悬臂浇筑法和大节段支架现浇法两种施工方法,建立平面杆系计算模型,分析连续梁在这两种施工方案下的受力差异,以便更好地为工程服务。研究结论:通过对比分析计算模型模拟的结果,采用两种不同的施工方法连续梁的弯矩、剪力均存在较大差异,具体表现为:与挂篮悬臂浇筑法相比,采用大节段支架现浇使得该梁负弯矩减小,而正弯矩增大;边跨剪力减小,而中跨剪力增大。

A Comparative Analysis of the Cradle Cantilever Casting and Large Segmental Support Cast- in- place Method

Research purposes:The comparison of cradle cantilever casting method and large segmental Support Cast-in-place method just concerned about the period and construction cost,while ignoring the difference of structure stress.The plane bar system model of the structure was formed by simulating cradle cantilever casting method and large segmental Support Cast-in-Place method.Analysis on the difference about mechanical characteristic of continuous beam provides references for practice. Research conclusions:By comparing the results model analysis,the bending moment and shear of continuous beam are different in two construction method.Compared with the cradle cantilever casting method,using large segmental Support Cast-in-place method would reduce the negative moment,increase positive moment of the beam and make the shear of mid-span increase,the shear of side span reduce.