悬臂浇筑预应力混凝土连续梁桥建模的探讨

该文主要利用实例,通过桥梁博士程序对连续梁桥建模,在桥梁总长度、边跨比、全桥预应力筋配置及施工阶段模拟相同的前提下,只变动零号块及边跨现浇段的加密单元的长度,建立两种模型;通过两种模型在承载力极限状态下计算结果的对比,探讨建模过程中应注意的模型单元的划分精度要求、钢束布置要点、边界条件问题,以及模拟挂篮施工的注意事项。这样有利于理清桥梁设计思路,同时也可确保后期的连续梁桥的内力计算结果的可靠度接近实体桥型。

Discussion of Modeling for Pre-stressed Concrete Continuous Beam Bridge by Cantilever Pouring

Using the engineering cases and the bridge Ph.D.program,the article creates a continuous beam bridge modeling.Under the same premise of simulating the total length of the bridge,the side span ratio,the configuration of pre-stressed reinforcement of the whole bridge and the construction phase,it is only to change the lengths of the zero block encryption unit and the side span cast-in-place segment encryption unit to establish two models.According to the comparison of calculation results of two models under the ultimate limit state of bearing capacity,the article discusses the dividing accuracy requirements,steel beam layout gist and boundary condition of the model units for attention in the modeling process,and the matters needing attention in simulating the form traveler construction.These will help sort out the bridge design ideas,and can also ensure the reliability of the internal force calculation results of the continuous beam bridge closing to the entity bridge type in the latter stage.