大悬臂预应力混凝土盖梁配束研究及空间力学分析
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摘要
为研究大悬臂预应力混凝土盖梁合理配束形式并优化盖梁结构设计,探讨了三种配束方案,在统一的目标下,利用有限元软件MIDAS模拟计算,并根据计算结果对各方案从施工流程、应力状态、经济性、结构安全度等角度进行分析评价。选取一种配束方案,利用有限元软件ANSYS,针对几个关键性工况进行空间实体分析。研究表明:三种配束方案均有自身的优缺点,设计时应根据结构尺寸及外部荷载的大小选取合适的配束方案。实体分析和杆系分析结果大体吻合较好,但由于桥墩横向宽度的影响,杆系计算结果一般情况下偏于保守。
In order to study the reasonable beam matching form of large cantilever pre-stressed concrete bent cap and to optimize the structure design of bent cap, this paper discusses three beam matching schemes.Under the unified objective, the finite element software MIDAS is adopted to simulate the calculation. Based on the calculation result, this paper analyzes and evaluates various schemes from aspects of construction process, stress state, economy and structural safety. The finite element software ANSYS is adopted to carry out the spatial entity analysis of several key working conditions by a beam matching scheme. The study shows that three beam matching schemes have own advantages and disadvantages. In the design, the proper beam matching scheme should be selected according to the structure dimensions and the external load sizes. The results of the entity analysis and the bar system analysis are generally matched better. The calculation result of bar system is generally conservative because of transverse width of bridge pier.
In order to study the reasonable beam matching form of large cantilever pre-stressed concrete bent cap and to optimize the structure design of bent cap, this paper discusses three beam matching schemes.Under the unified objective, the finite element software MIDAS is adopted to simulate the calculation. Based on the calculation result, this paper analyzes and evaluates various schemes from aspects of construction process, stress state, economy and structural safety. The finite element software ANSYS is adopted to carry out the spatial entity analysis of several key working conditions by a beam matching scheme. The study shows that three beam matching schemes have own advantages and disadvantages. In the design, the proper beam matching scheme should be selected according to the structure dimensions and the external load sizes. The results of the entity analysis and the bar system analysis are generally matched better. The calculation result of bar system is generally conservative because of transverse width of bridge pier.
引文
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[6]祁巍,聂拥军.大悬臂预应力盖梁设计与计算[J].城市道桥与防洪,2015(4):65-68.
[2]张建新.大悬臂预应力混凝土盖梁设计[J].交通世界,2014(z1):144-145.
[3]王银桥,李朝晖,陈泉,等.大悬臂预应力混凝土盖梁受力特性分析[J].城市道桥与防洪,2007(5):100-102.
[4]余露.大悬臂预应力混凝土盖梁设计[J].中国市政工程,2010(2):25-27.
[5]贺星新,徐伟,端茂军,等.大悬臂预应力混凝土盖梁空间受力分析[J].南京工程学院学报(自然科学版),2013,11(1):39-43.
[6]祁巍,聂拥军.大悬臂预应力盖梁设计与计算[J].城市道桥与防洪,2015(4):65-68.