体外预应力桥梁转向块的受力性能分析

发布时间：2018-05-07 18:05

本文选题：体外预应力 + 转向块　；参考：《中外公路》2017年05期

【摘要】：转向块是体外预应力桥梁中一种传力构件,由于转向块形状不规则,且要承受预应力筋对转向块中预留孔道的巨大作用力,所以转向块会出现受力集中的情况,其预留孔道周围应力分布复杂,是控制设计的关键部位。转向结构的可靠程度直接关系到大桥的安全和稳定。该文应用Ansys软件对一横隔板式转向块进行仿真分析,揭示了转向块的应力传递路线和受力特性。应力分析结果表明:横隔板式转向块在抵抗预应力筋转向力的过程中,形成了预应力筋孔道上部受压、下部受拉的应力分布,最大拉应力和最大压应力分别发生在预留孔道的下缘和上缘处。提出了在设计中应优先选用整体加厚的转向块,能改善转向块的受力特性,保证大桥的安全和稳定。
[Abstract]:Steering block is a kind of force transfer component in externally prestressed bridge. Because the steering block is irregular in shape and subjected to the huge force of prestressing tendons on the reserved hole in the steering block, the steering block will have a concentrated force. The stress distribution around the reserved channel is complex, which is the key part to control the design. The reliability of the steering structure is directly related to the safety and stability of the bridge. In this paper, the Ansys software is used to simulate and analyze a cross diaphragm steering block, and the stress transfer route and stress characteristics of the steering block are revealed. The results of stress analysis show that in the process of resisting the steering force of prestressed tendons, the stress distribution of the upper part and the lower part of the prestressed reinforcement channel is formed. The maximum tensile stress and the maximum compressive stress occur at the lower and upper edge of the reserved channel, respectively. It is suggested that the integral thickened steering block should be selected first in the design, which can improve the mechanical characteristics of the steering block and ensure the safety and stability of the bridge.
【作者单位】：长沙理工大学土木与建筑工程学院;
【基金】：国家重点基础研究发展计划(973计划)项目(编号:2015CB057702) 湖南省高校创新平台开放基金项目(编号:13k051) 湖湘青年英才支持计划项目(编号:2015RS4052)
【分类号】：U445.72

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