基于平面框架模型的肋式转向结构简化计算方法

发布时间：2018-02-15 03:42

  本文关键词： 体外预应力 转向结构 平面框架模型 配筋设计 简化计算　出处：《同济大学学报(自然科学版)》2016年10期 　论文类型：期刊论文

【摘要】：针对肋式转向结构的受力分析和配筋设计,提出了一种基于平面框架模型的简化计算方法,将转向块所在的箱梁节段转化为平面框架模型,其中顶板、腹板、底板转化为三自由度梁单元,转向结构网式划分为等效梁格.由于顶板、腹板的纵向长度对转向结构受力影响很小,因此取为与转向结构同宽,此时平面框架模型如同倒置的简支T梁,平面框架模型中的底板纵向长度可以通过比拟规范中T梁的有效分布宽度确定.与空间网格模型、ANSYS实体模型的相比,简化方法在绝大多数情况下误差仅为5%~20%,且结果偏于安全.最后,将简化方法应用到国内的两座实桥中并与实桥配筋进行对比,发现实桥转向结构配筋量远大于计算值,配筋偏于安全.此简化方法同样适用于配置双层甚至多层转向管道的转向结构的配筋设计.
[Abstract]:Aiming at the stress analysis and reinforcement design of ribbed steering structure, a simplified calculation method based on plane frame model is proposed, in which the section of box girder of steering block is transformed into a plane frame model, in which the top plate and web plate are used. The bottom plate is transformed into three degree of freedom beam element, and the steering structure network is divided into equivalent girder lattice. Because of the roof, the longitudinal length of the web has little effect on the steering structure, so it is taken as the same width as the steering structure. In this case, the plane frame model is like a simply supported T beam, and the longitudinal length of the bottom plate in the plane frame model can be determined by comparing the effective distribution width of the T beam in the specification. In most cases, the error of the simplified method is only 5 / 20, and the result is relatively safe. Finally, the simplified method is applied to the two real bridges in China and compared with the reinforcement of the real bridge, and it is found that the amount of reinforcement in the steering structure of the real bridge is much larger than the calculated value. The simplified method is also suitable for the reinforcement design of steering structures with double-layer or even multi-layer steering pipes.
【作者单位】： 同济大学土木工程学院;天津市政工程设计研究院;
【分类号】：U448.35
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本文编号：1512342