基于多尺度模型的海河大桥施工数值模拟

发布时间：2019-05-18 18:45

【摘要】：本文以在建的海河大桥为工程背景,对桥梁施工过程及布置两种不同抗拔件情况下桥面板的施工过程进行了数值模拟,所完成的主要工作如下:采用ANSYS有限元软件,建立了海河大桥宏观有限元模型,根据宏观模型的数值模拟结果及节点构造情况,确定需建立精细化模型的节点,并建立了桥梁多尺度有限元模型。基于多尺度模型,考虑了混凝土收缩徐变的影响,利用生死单元法对海河大桥的施工过程进行了模拟。根据模拟结果,总结了各工况下精细化节点模型应力分布规律及全桥位移分布规律。针对采用弹簧单元模拟布置在桥梁支座负弯矩区上弦抗拔件时存在的问题,提出了一种在不同工况间实现上弦与混凝土板连接条件变化的模拟方法。对两种抗拔件布置方案下桥面板的施工过程进行了模拟,与不考虑负弯矩区上弦与混凝土板之间粘结的模拟结果进行了比较,发现两种抗拔件布置方案下模拟得到的桥梁位移均比无滑移的情况小;两种抗拔件均会使桁架上弦受到预压力的作用;抗拔件的布置对负弯矩区桥面板拉应力分布影响较小。
[Abstract]:In this paper, based on the Haihe Bridge under construction, the construction process of the bridge and the construction process of the bridge deck are simulated under the condition of two different anti-pulling parts. The main work is as follows: using ANSYS finite element software, The macroscopic finite element model of Haihe Bridge is established. According to the numerical simulation results of the macro model and the node construction, the nodes that need to establish the fine model are determined, and the multi-scale finite element model of the bridge is established. Based on the multi-scale model, the influence of concrete shrinkage and creep is considered, and the construction process of Haihe Bridge is simulated by using the life and death element method. According to the simulation results, the stress distribution law of fine joint model and the displacement distribution law of the whole bridge under each working condition are summarized. In order to solve the problem of using spring element to simulate and arrange the anti-pulling parts of the upper string in the negative moment area of the bridge support, a simulation method is proposed to realize the change of the connection conditions between the upper string and the concrete slab between different working conditions. The construction process of bridge deck under two kinds of anti-pullout arrangement schemes is simulated, and the simulation results are compared with the simulation results without considering the bond between the upper chord and concrete slab in the negative moment area. It is found that the bridge displacement simulated under the two anti-pullout layout schemes is smaller than that without slip. The two kinds of anti-pullout parts will make the upper string of truss subjected to preloading, and the arrangement of anti-pullout parts has little effect on the tensile stress distribution of bridge deck in negative moment area.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445

【参考文献】